This is an exercise on the density of liquids and gases.
The data provided in the exercise are:
Density (d) = ?
Mass (m) = 64g
Volume (v) = 8cm³
To calculate the density of the cube when it is placed on the balance, divide the mass divided by the volume. We apply the following formula:
d = m/vWe substitute our data in the formula and solve:
d = (64 g)/(8 cm³)d = 8 g/cm³Answer: The density of the cube placed on the three-beam balance is 8 g/cm³. ✅
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The correct answer is an important measure for controlling bias.
An effective way to prevent under-coverage in a memory experiment would be to randomly assign students to two separate groups.
The scientific method that must be repeatable and the data must be empirical for science to be trusted.
When scientists publish their work, they include enough information so that other scientists can repeat the experiment and obtain the same outcomes.
Additionally, in contrast to theories that are not supported by facts, the scientific method is founded on empirical evidence, which is derived from personal observations of the outside world.
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The rectangular resistors with leads specifically made to fit into printed circuit boards are ____ resistors.
The rectangular resistors with leads specifically made to fit into printed circuit boards are surface mount resistors.
The resistors are the device which resists the motion of current or electricity.
They are electronic devices used in electrical circuits.
The general type of resistors which are rectangular with leads so taht they fit the circuit boards are called surface mount resistors.
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Two solid metal balls all have the same radius. one is made of aluminum, the other of gold. if the balls are resting at the bottom of a pool of water, which ball has the largest buoyant force?
The buoyancy force on the gold ball will be more than that of aluminum.
What is buoyancy force?An upward force applied by a fluid against the weight of an item that is partially or totally submerged is known as upthrust, also known as buoyancy. Pressure in a fluid column increases with depth due to the weight of the fluid on top.
Given that two solid metal balls all have the same radius. one is made of aluminum, the other of gold. And the balls are resting at the bottom of a pool of water.
The buoyancy force at the bottom force will be calculated by finding the density of the balls.
Buoyancy force = Volume inside water x Density X g
Density of gold = 19.3 g / cc
Density of aluminium = 2.7 g / cc
Since the density of the gold ball is more than the density of the aluminum ball.
Therefore, the buoyancy force on the gold ball will be more than that of aluminum.
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Find the x-component of this
vector:
Answer:
4.978 m
Explanation:
[tex]\mathsf v_x[/tex] , the x-component of a vector is given by [tex]\boldsymbol v\cos\theta[/tex] where [tex]\theta[/tex] is the angle formed by the vector with the x-axis. The sign of the x-component depends on which quadrant the vector is
Here [tex]\theta = 77.1[/tex]°
[tex]\cost\theta = \cos(77.1) = 0.22325[/tex]
The vector has magnitude of 22.3 m
So the x-component = 22.3 x 0.22325 = 4.978 m
In heat conduction analysis, the conversion of ____ energy into ____ energy in solids is called heat generation. check all that apply
Heat conduction, also named as thermal conduction, is the heat flux in a body due to temperature difference and occurs by the movement of electrons within a body.
When all the available energies such as electrical energies, chemical energies or the nuclear energies are converted to the thermal energy, the the conversion process is called heat generation.
Thermal conduction is the process when the heat transfers from hotter region to the colder region.
In heat conduction analysis, the conversion of electrical, chemical or nuclear energy into thermal energy in solids is called as heat generation.
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Apartment traveling on a straight road at 15.0m/s accelerate uniformly to a speed of 21.0m/s in 12.0 seconds the total distance traveled by the car in this 12.0 seconds time interval is
By using uniform motion, the distance traveled by the car is 216 m.
We need to know about the uniform motion to solve this problem. The uniform motion is an object's motion under acceleration. It should follow the rule
vt = vo + a . t
vt² = vo² + 2a . s
s = vo . t + 1/2 . a . t²
where vt is final velocity, vo is initial velocity, a is acceleration, t is time and s is displacement.
From the question above, we know that
vo = 15 m/s
vt = 21 m/s
t = 12 s
Find the acceleration
vt = vo + a . t
21 = 15 + a . 12
12a = 6
a = 0.5 m/s²
By using the third equation, we can calculate the distance
s = vo . t + 1/2 . a . t²
s = 15 . 12 + 1/2 . 0.5 . 12²
s = 180 + 36
s = 216 m
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A race car is moving at 40.0 m/s around a circular racetrack of radius 265 m. calculate the period of the motion.
The race car that is moving at 40.0 m/s around a circular racetrack of radius 265 m has a period of motion of 41.63 s
To solve this tangential velocity problem the formula and the procedure we will use is:
v = (2 * π * r) / T
Where:
v = tangential velocityπ = mathematical constantr = radiusT = periodInformation about the problem:
v = 40.0 m/sπ = 3.1416r = 265 mT=?Applying the tangential velocity formula and isolating the period, we get:
v = (2 * π * r)/ T
T = (2 * π * r)/ v
T = (2 * 3.1416* 265 m) / 40.0 m/s
T = (1665.04 m) / 40.0 m/s
T = 41.63 s
What is tangential velocity?In physics is the length of arc traveled in each unit of time in uniform circular motion. It is expressed in units of distance per time (m/s), (km/h).
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Calculating The Milky Way galaxy contains
between 200 and 400 billion stars. Estimate the
number of stars in a cluster of 30 galaxies similar
in size to the Milky Way. Your answer should
consist of a low estimate and a high estimate,
both expressed in scientific notation.
——I NEED HELP ASAP!! PLEASE
The number of stars range between 6 * 10^9 stars and 1.2 * 10^10 stars.
What is the number of stars?We know that a galaxy is composed of many stars. The stars in the galaxy as we saw from the question, using the milky way as a template may have between 200 and 400 billion stars.
The number of stars could be obtained as the product of the number of galaxies and the number of stars in the lower and the upper limits.
Number of stars in the lower estimate = 200 * 10^6 * 30 = 6 * 10^9 stars
Number of stars in the higher estimate = 400 * 10^6 * 30 = 1.2 * 10^10 stars
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At which lettered point or points is the object moving to the left, if the positive x-direction corresponds to its rightward movement?
At F the object moving to the left, if the positive x-direction corresponds to its rightward movement.
Δx = [tex]X _{2}[/tex] - [tex]X_{1}[/tex]
where,
Δx = Change in position
[tex]X _{2}[/tex] = Final position
[tex]X_{1}[/tex] = Initial position
If Δx is positive, the object is moving forwards ( Right ).
If Δx is negative, the object is moving backwards ( Left ).
If the curve is moving from top to bottom Δx will be negative and if the curve is moving from bottom to top Δx will be positive.
So, in this given curve, at the points B, C and D, the curve is moving from bottom to top meaning that the object is moving to the right and at the point F, the curve is moving from top to bottom meaning that the object is moving to the left.
Therefore, At F the object moving to the left, if the positive x-direction corresponds to its rightward movement.
The given question contains no distance - time graph. I considered the attached image as the graph.
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A proton, which is the nucleus of a hydrogen atom, can be modeled as a sphere with a diameter of 2.4fm and a mass of 1.67x10-27kg. determine the density of the proton.
The density of a proton is 2.87 x 10^19 kg/m^3.
The density of a proton can be calculated by dividing its mass by its volume i.e.,
Density = Mass/Volume
The mass of a proton is given to be 1.67 x 10^-27 kg.
As the proton is assumed to be a sphere, its volume will be 4/3 π r^3.
Thus, density = 1.67 x 10^-27/ (4/3 x π x r^3)
Putting radius of proton(r) = 2.4 fm = 2.4 x 10^-15 m
The density comes out to be 2.87 x 10^19 kg/m^3.
Thus, the density of a proton is 2.87 x 10^19 kg/m^3.
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By default setting, the word stored at address 0x8004 is: _______________________
According to the given statement is At address 0x8004, the default data word is 0xA7908CEE.
Briefing:Little Endian method with a word size of 4 Bytes is the default on ARM processors.
Data is stored in the memory bytes at a time, and access is done in words.
The data must be stored in 4 cells because word size is equal to 4 bytes.
i.e., the data word is retrieved in parallel from 4 cells.
Little endian states that lower addresses have lower bytes and higher addresses have higher bytes.
At location 0x8004, the default data word is 0xA7908CEE.
What is little endian data?The sequence in which data is stored in memory is referred to as the "little-endian" convention. According to this convention, the least significant bit (or "littlest" end) is placed at address 0 first, followed by the storage of following bits one at a time.
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Roughly how many times farther is it from the sun to alpha centauri than from the sun to jupiter?
From the sun to Alpha Centauri than from the sun to Jupiter it is 105 times further. The age of Alpha Centauri is 5.3 billion years older. It also moves in a totally different way. Even though it is close by, it is only passing.
What if Alpha Centauri replaced the position of the Sun?Alpha Centauri A is around 100,000 miles farther away, 10% more massive, and a little bigger than our Sun. All of the planets' orbits will become more elliptical as a result of the increased mass. The reality that Alpha Centauri A is 50% brighter than our star, placing Earth slightly inside the habitable zone, is much worse for the Earth. Most of Earth's surface is currently uninhabitable due to its average surface temperature of 43 degrees Celsius, according to Universe Sandbox 2. It has been clearly stated to us, though, that a temperature so high would most likely lead to an uncontrollable greenhouse effect by increasing the amount of water vapor in the atmosphere.
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using a(n) researchers can examine the brain's magnetic fields, which help researchers understand how certain tasks influence brain activity based on the speed and strength of the magnetic field.
Magnetoencephalography (MEG) allows researchers to examine the brain's magnetic field. Which helped researchers to understand how certain tasks influence brain activity.
It isn't. Invaluable tool to study the large scale brain activity. And interactions with the body.
MEG was developed in 1960s .
In this technique weak magnetic forces associated with electrical activities of brain are monitored .
It collects activity from neurons visualized as brain waves and it is used with MRI in magnetic source imaging.
Med fields passes through the head without any distortion.
It provides a Spatial and temporal resolution.
Magnetoencephalography (MEG) allows researchers to examine the brain's magnetic field.
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In parabolic solar cooker a cooking vessel is not kept at the radius of the curved surface
In parabolic solar cooker, the container of cooking is placed at the focal point of mirror of parabolic shape so that all rays that are falling on solar cooker can converge to one point and produce large amount of heat energy.
A parabolic solar cooker is a cooking device that works on the energy generated from solar panel.
Though solar cookers are slow to cook, they are green sources of energy utilizer as well as renewable source of energy.
Parabolic solar cookers make the use of a reflector which is parabolic in shape to concentrate sunlight into a smaller area in order to generate heat for cooking. They are able to reach high temperatures, which allows them to be used for grilling and frying. These temperatures are significantly higher than what can be reached by a solar box cookers or solar panel cookers .
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How far does an object go after the pushing force is removed till it stops. the object's speed is 1.70 m/s when the pushing force is removed. friction is 52.0 n and mass of object is 80.0kg
By using uniform motion, the object will travel 2.22 meters until it stops.
We need to know about the uniform motion to solve this problem. The uniform motion is an object's motion under acceleration. It should follow the rule
vt = vo + a . t
vt² = vo² + 2a . s
s = vo . t + 1/2 . a . t²
where vt is final velocity, vo is initial velocity, a is acceleration, t is time and s is displacement.
From the question above, we know that
vo = 1.70 m/s
F = -52 N
m = 80 kg
vt = 0 m/s
Find the deceleration
F = m . a
-52 = 80 . a
a = -0.65 m/s²
Find the distance using the second equation
vt² = vo² + 2a . s
0² = 1.7² + 2(-0.65) . s
1.3s = 2.89
s = 2.22 meters
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When 5.0 a at 110 v flows in the primary of an ideal transformer, how many amps at 24 v can flow in the secondary?
The current that can flow in the secondary is 23 A
According to Transformation ratio,
[tex]V_{p}[/tex] / [tex]V_{s}[/tex] = [tex]I_{s}[/tex] / [tex]I_{p}[/tex]
where,
[tex]V_{p}[/tex] = Voltage across the primary coil
[tex]V_{s}[/tex] = Voltage across the secondary coil
[tex]I_{s}[/tex] = Current in the primary coil
[tex]I_{p}[/tex] = Current in the secondary coil
Given that,
[tex]V_{p}[/tex] = 110 V
[tex]V_{s}[/tex] = 24 V
[tex]I_{p}[/tex] = 5 A
[tex]V_{p}[/tex] / [tex]V_{s}[/tex] = [tex]I_{s}[/tex] / [tex]I_{p}[/tex]
110 / 24 = [tex]I_{s}[/tex] / 5
[tex]I_{s}[/tex] = 22.9 = 23 A
Transformation ratio is the ratio of secondary voltage to primary voltage.
Therefore, The current that can flow in the secondary is 23 A
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The left hand plays a steady one-two beat in duple meter, while the right hand emphasizes notes that fall in between these beats. what is the name for this technique?
The left hand plays a steady one-two beat in duple meter, while the right hand emphasizes notes that fall in between these beats. The name for this technique is syncopation.
What is syncopation?Syncopation in music is the technique of fusing several rhythms to produce an entirely or partially off-beat piece of music. Simpler definitions for syncopation include "a disruption or interruption of the regular flow of rhythm" and "the placing of rhythmic stresses or accents where they wouldn't normally occur." It requires the correlation of at least two sets of time periods. Syncopation is used in many different musical genres, especially dance music. According to music producer Rick Snoman, syncopation is a fundamental element of any dance music and frequently serves to tie the entire song together. Syncopation, usually in the form of a back beat, is a feature of almost all contemporary popular music.Learn more about the syncopation with the help of the given link:
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If the frequency of a wave is
20
H
z
, what is the period of the wave?
A tortoise can run with a speed of 16.3 cm/s, and a hare can run 220.2 cm/s. In a race, they both start at the same time, but the hare stops to rest for 1.6 min. The tortoise wins by 108 cm.
What was the length of the race in cm?
The correct answer is 369.2765m
Speed of tortoise = v_t= 16.3cm/s=0.163m/s
Speed of hare= v_h=220.2cm/s=2.202m/s
Rest time of hare is t_r=1.6min
Tortoise wins by distance of x = 108cm=1.08m
Consider that S is the length of a racetrack.
At the conclusion of the race, calculate the tortoise's distance travelled.
S=v_t×t
S=0.163m/s×t ______(1)
Here, t is the race's actual time.
Find out how long the hare spent racing.
t_h=t-t_r
t_h=t-1.6min×(60s/1min)
t_h=(t-2160)s
At the conclusion of the race, determine the hare's distance travelled.
S-x=v_h×t_h
S-1.08m=2.2×(t-2160)s
S=2.2×(t-2160)s+1.08m_____(2)
To determine the race time, substitute equation (1) for equation (2).
0.163m/s×t=S=2.2×(t-2160)s+1.08m
0.163t=2.26t-4752+1.08
4752-1.08=2.26t-0.163t
4750.92=2.097t
4750.92/2.097=t
2265.5=t
To determine the length of the race or the track, substitute the amount of time in equation (1).
S=0.163m/s×t
S=0.163×2265.5
S=369.2765m
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what is nuclear emission?
An astronaut of mass 70 kg weighs 700 n on earth's surface. his weight on the surface of mars, where the acceleration due to gravity is 3.7 m/s2, would be about?
The astronaut's weight on the surface of Mars is 259 N
To solve this exercise, the formula and procedure to be applied is:
W = m * g
Where:
W = weightm = massg = gravityInformation about the problem:
g= 3.7 m/s2m = 70 kgW=?1 N = kg * m/s²Applying the weight formula, we get:
W = m * g
W = 70 kg * 3.7 m/s2
W = 259 N
What is gravity?In physics, gravity is the force of attraction that the earth exerts on all bodies possessing mass by pulling them toward its center.
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A radioactive element decays with a half-life of 9 years. if a mass of the element weighs 6 pounds at t=0, find the amount of the element after 11.5 years.
By the half-life of radioactive, the remaining mass of radioactive elements is 2.47 pounds.
We need to know about the half-life of the radioactive elements to solve this problem. The radioactive element will decay over time and follow the equation
N = No(1/2)^(t/t'')
where N is the final quantity, No is the initial quantity, λ is the decaying constant, t is time and t'' is the half-life of a radioactive element.
From the question above, we know that
t'' = 9 years
No = 6 pounds
t = 11.5 years
Calculate the remaining mass
N = No(1/2)^(t/t'')
N = 6(1/2)^(11.5/9)
N = 2.47 pounds
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Which of the points a(9, 0, 1), b(9, 7, 3), and c(1, 8, 6) is closest to the yz-plane? which point lies in the xz-plane?
The distance of a point to the yz-plane is given by the absolute value of the x coordinate. So, for point A, the distance is equal to,
Dyz = | -4 | = 4 units
Next, for point B, the distance is equal to,
Dyz = | 3 | = 3 units
Lastly, for point C, the distance is equal to,
Dyz = | 2 | = 2 units
Since point C has the smallest distance to the yz -plane, this point is closest to the yz-plane.
Unlike the regular 2-dimensional Cartesian coordinate system, a three-dimensional coordinate system contains three axes. To plot points in this coordinate system, the point's ordered triple must be known, (x,y,z,).Each coordinate on the ordered triple represents a point that lies on one of the axes
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A car is traveling at a speed of 33 m/s . (a) what is its speed in kilometers per hour? (b) is it exceeding the 90 km/h speed limit?
According to the statement:
a) speed is equal to 118 km/h in kilometres per hour.
b) yes it is exceeding 90km/h.
What does speed mean?The pace at which an object's position changes in any direction is referred to as speed. Speed is defined as the ratio of something like the distance traversed to the time required to cover that distance. . . Speed is a scalar quantity since it just has a direction and no magnitude..
How are the speeds determined?Speed is determined by dividing the distance by the time. Calculating the units for speed requires knowledge of the units for both time and distance.. The units in this example will be meters per second (m/s), since the distance is measured in meters (m) and the time is measured in seconds (s).
(a)s₂= 118.km/h is its speed in kilometres per hour.
1h = 3600s
1km = 1000m
s₂= (33m/s) *[tex]\left(\frac{60 \times 60}{1000}\right)[/tex]
= 118.8km/h
s₂= 118.km/h
(b) yes it is exceeding 90km/h.
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____ voltage controls are simply controls that do not employ the use of a control transformer to change the voltage to a lower value.
The appropriate word in the blank is → Line.
We have a statement regarding Voltage controls.
We have to fill in the blank with appropriate word.
Why is Voltage control needed ?Voltage control is necessary to prevent damage such as overheating of generators and motors, to reduce transmission losses.
According to the question, we have -
____ voltage controls are simply controls that do not employ the use of a control transformer to change the voltage to a lower value.
The appropriate word for the blank is → Line. Line voltage controls do not employ control transformer to decrease voltage. Line voltage controllers are designed to regulate the voltage of HVAC systems which require direct electrical power. These controllers are also known as inline thermostats and are typically connected to wires supplying 120 to 240 volts of power to heating or cooling device.
Hence, the appropriate word for the blank is → Line
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After you perform gel electrophoresis on your pcr product, you see that one sample has a 200 bp band and the other does not. what can you conclude from these results?
After performing gel electrophoresis on the pcr product, you see that one sample has a 200 bp band and the other does not this shows that 200 bp band is significantly larger than the size of primer dimers unless the primers are 100 bp long, they are not visible.
Gel electrophoresis is the process used to evaluate the success of the PCR reaction.A closer examination of the suitability of agarose gel electrophoresis is done for assessing PCR product yield.
PCR is a series of chemical reactions that take place outside a living cell
Use of 2% agarose gel and 100bp marker and spreading the marker strips properly with 80-90V is done to avoid heating.
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a bag is dropped from a hovering helicopter. the bag has fallen for 1.6 s. what is the bag's velocity?
The bag's velocity when a bag is dropped from a hovering helicopter is 15.68m/s
Its initial velocity is zero. In a free-falling body, the value of the final velocity is obtained through the equation
Vf =u + gt
u = o ( because the bag is dropped, so it falls starting from rest)
Vf = gt
u is initial velocity
Vf is final velocity
t is time
where g is the acceleration due to gravity, 9.8 m/s².
using above values we get
Vf = (9.8 m/s²)(1.6s)
= 15.68m/s
The bag's velocity when a bag is dropped from a hovering helicopter is 15.68m/s
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You are given the equation(s) used to solve a problem. write a realistic problem for which this is the correct equation(s) number 72
Complete Question
In Problems 69 through 72 you are given the equation(s) used to solve a problem. For each of these,
(a) Write a realistic problem for which this is the correct equation(s).
The electric field due to a point charge at distance of 1 um is given as 1.5x10^6 N/C
E = (9*10^9 Nm^2/C^2*N*1.6*10^-19 C)/(1*10^-6)^2
E = 1.5x10^6 N/C
Hence, Electric field is 1.5x10^6 N/C
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A student adds two displacement vectors with magnitudes of 6.0 m and 8.0 m,
The correct answer is (E) It could have any value between 2.0 km and 14.0 km depending on how the vectors are oriented.
The magnitude of the resultant displacement could have any value between 2.0 km and 14.0 km depending on how the vectors are oriented.
How is resultant displacement calculated?In physics, displacement (which is a vector quantity) refers to a change in an object's position. When you compute displacement, you compare an object's original and final locations to determine how "out of place" it is. The formula you employ to calculate displacement will be based on the variables presented to you in a particular problem.
The resultant is the vector sum of each individual vector. The different vectors are combined to produce the outcome. By combining the separate displacements using vector addition techniques, the outcome can be calculated.
Therefore the resultant displacement can have any value from 2-14. It depends upon the orientation of displacement vectors.
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The complete question is:
"A physics student adds two displacement vectors with magnitudes of 8.0 km and 6.0 km. Which one of the following statements is true concerning the magnitude of the resultant displacement? A) It must be 10.0 km. B) It must be 14.0 km. C) It could be equal to zero kilometers, depending on how the vectors are oriented. D) No conclusion can be reached without knowing the directions of the vectors. E) It could have any value between 2.0 km and 14.0 km depending on how the vectors are oriented."
A fluid has a density of 1040 kg/m^e. if it rises to a height of 1.60 cm in a 1.50 mm diameter capiallry tube, what is the surface tension of the lquid. assume a contact angle of zero.
The calculated surface tension is 9.36 × (10^-2) N/m.
A liquid's density is a gauge of how heavy it is relative to the amount being measured. The liquid that weighs heavier is denser if you weigh two liquids with similar volumes or amounts. A substance that is less dense than water will float if it is gently introduced to the water's surface.
H equals ((2 cos)/ g r)
2γ = h ρ g r 2γ = 1,8 (10^-5) (1040) (10)
γ = 9 (1040) (10^-4)
γ = 9.36 × (10^-2) N/m
Because it enables us to predict which compounds will float and which will sink in a liquid, density is a crucial notion. As long as an object's density is lower than the liquid's density, it will often float.
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