Answer:
2.8 would be the correct answer as 1 rounds down
In a tug-of-war between two athletes, each pulls on the rope with a force of 640 N What is the absolute value of the horizontal force that each athlete exerts against the ground?
Since the rope is not moving, the 300N tension acts as if the other end of the rope were fixed to a certain location for each team. It must exert an equivalent and opposing horizontal force, thus it is 300N as well.
The tension in the rope during a tug-of-war is caused by pulling forces at both ends. Since there is a 250 N pulling force at either end, but it pulls in the opposite direction, the tension on the rope will be caused by these two pulling forces together. When two opposing forces of 100N each are applied to the ends of a rope, the tension in the rope will be zero because the opposing forces, despite having the same magnitude, operate on the same body in opposing directions and cancel one another out.
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At the end of a race a runner decelerates from a velocity of 9.00 m/s at a rate of 0.300 m/s2.
(a) How far does she travel in the next 15.0 s?
(b) What is her final velocity?
(a)In the next 15.0s, she traveled 101.250 m.
(b) 4.50 m/s is the runner's final speed.
Given:- initial velocity = 9m/s , deacceleration = 0.3 m/s2
distana(d), she moves in time (t)=15 s,
and we must determine this using the second equation of motion.
S = ut + 1/2 at2,
where s = the distance
u = initial velocity
t = time
a=-d = 0.300m/s
t=15.0
By putting all values in the formula above,
we have
d = (9.00)x(15.0)-1/2 (0.300) (15.0)²
d= 101.250 m.
In the next 15.0s, she traveled 101.250 m.
final speed (v) =?
from 1 Equation of Motion : v = u+at.
To solve, v=?
u=9.00 m/s
a= -d= 0.300 m/s²
t=15.0
v=u+at
v= 9 - 0.300 X15.0
= 4.50 m/s
4.50 m/s is the runner's final speed.
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An object with a mass of 20 kg has a het force of 80 N acting on it. What is the acceleration of the object?
Explanation:
f=ma
a=f/m
a=80/20 = 4m/s
Sam's mom says: "We're about to eat dinner! Don't go more than a few blocks from home!" Is Sam's mom
more worried about Sam's distance or his displacement? Circle one and explain why you picked it.
Answer:
Displacement
Explanation:
I think Sam's mom isn't worried with how far away he goes, but will be upset if he isn't home fast enough for dinner.
Which of the following is true about the International Space Station?
A
It is on the surface of Mars.
B
It is the size of ten football fields.
C
It was built from separate parts sent to space.
D
It was a partnership between the US and Soviet Union.
Answer:
c because first is totally wrong and second one is about two football fields and d is also totally wrong because it is a partnership of at least 10 countrie so.i think č is correct answer.
76. Two electric charges -6μC and
+6μC are placed respectively in two
points A and B distant of 1m apart. The
electric field is null at the point C:
A.Located in the middle of the
segment AB
B.Located outside segment AB at
1m from A.
C.Located outside segment AB at
1m from B
D.Outside the line AB
E.No answer is right.
A. The electric field is null at the point C; located in the middle of the
segment AB.
What is electric field?Electric field is the region of space where the influence of electric force is felt.
Electric field at the middle of ABE = kq/r²
where;
r is the middle of AB = 0.5 mE(+6μC) = (9 x 10⁹ x 6 x 10⁻⁶) / (0.5²)
E(+6μC) = +216,000
E(-6μC) = (9 x 10⁹ x 6 x 10⁻⁶) / (0.5²)
E(-6μC) = -216,000
Sum of the electric field at the middle of ABE(net) = E(+6μC) + E(-6μC)
E(net) = 216,000 - 216,000 = 0
Thus, the electric field is null at the point C; located in the middle of the
segment AB.
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A force of 30 N is exerted on a wheeled cart. There is so little friction you can
ignore it. The acceleration of the cart is 6 m/s². Find the mass of the cart.
Answer:
force =mass*acceleration due to gravity
mass=force/acceleration
mass =30/6
mass=5kg
Is a scientific law more accurate than a theory?
Yes a scientific is more accurate because it has what is actually correct and what is it and ect than a theory
In a biathalon race you first ride a bicycle at an average speed of 19.1 mi/h for 18.5 miles, then you must run for another 5.5 miles. With what average speed, in miles per hour, must you run if your average speed for the entire race is to be 14.5 mi/h?
The average speed you must run is 7.97 mph.
What is average speed?
The average speed of an object is the ratio of total distance traveled by the object to
Average speed = total distance / total time of motion
Total time of motion = total distance / average speed
total time = (18.5 + 5.5) / (14.5)
total time = 1.66 hours
time taken during the bicycle ridet1 = 18.5 / 19.1
t1 = 0.97 hour
time taken during the runt2 = 1.66 hr - 0.97 hr
t2 = 0.69 hr
Average speed during the runv = 5.5 miles /0.69 hr
v = 7.97 mph
Thus, the average speed you must run is 7.97 mph.
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A TV takes in 600J of electrical energy and gives out 300J of light, 240J of sound and 60J of heat energy (be careful here!). Calculate the efficiency.
Answer:
90%
Explanation:
The energy efficiency formula runs like efficiency = useful energy output/energy input * 100%.
The energy output here is 600 (300+240) and the input is 600J. However since its heat energy of 60 you won't include that. So you will input the output and the energy input in the formula and you will get 540/600=0.9
So your answer is 90%.
Sorry if its confusing, have a good day! :D
Which of these objects could be falling with constant acceleration?
Object 1 and Object 2 will have a constant acceleration.
We know the expression for Displacement, Acceleration, and Time can be represented by the equation: S = ut + 1/2at². We will compare cases for each object at a given position and time and check if the object maintains a constant acceleration.
=> S = ut +1/2at², where S = Displacement/position of object, u = Initial velocity, t = time, a = acceleration.
For Object 1,
Case 1 : 0.44 = 0*0.3 + 1/2*a*(0.3)²
a = 9.78
Case 2 : 3.14 = 0*0.08 + 1/2*a*(0.8)²
a = 9.81
Acceleration is approximately constant for object 1.
For Object 2:
Case 1 : 0.06 = (0) (0.3) + ½ a (0.3)²
a = 1.33
Case 2: 3.09 = (0) (2.1) + ½ a (2.1)²
a = 1.40
Acceleration is approximately constant for object 2.
For Object 3:
Case 1 : 0.44 = (0) (0.3) + ½ a (0.3)²
a = 9.78
Case 2: 3.09 = (0) (2.1) + ½ a (2.1)²
a = 1.40
Acceleration has a lot of differences in both cases of Object 3 so it's not constant.
Hence, Object 1 and Object 2 have constant acceleration.
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Three point charges (-6.0 mu{C}), (10.0 mu{C}) and (-7.0 mu{C}) are placed consecutively at corners of a square each side of which is 30 cm as shown in the figure. Calculate (vec{E}) at the vacant corner. Take ( k = 9.0times{10^{9}} Nm^ {2}C^{-2}).
Answer: (3.32times{10^{5}} Nm^ {-1})
Explanation:
Four people participate in a rope competition. Two of them pull the rope right exerting forces of magnitude 330 N and 380 N. The other two pull left exerting forces of magnitude 320 N and 410N.
A rope competition is played out between four participants. They both pull on the rope to the right while producing forces between 330 N and 380 N. The other two pull to the left with forces of 320 N and 410 N, respectively.
T2 = 250 and T1 = 250.57 [N] .57[N]
In order to create a free body diagram with all the forces acting on the body, we must first extract all the information they provide about the issue.
The free body diagram and associated forces are shown in the accompanying figure.
The T1 and T2 forces can be found by adding up the forces on the Y-axis; these forces are equal because they are a precondition for the problem. Therefore, this equation can be solved.
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2. The longest snake ever found was a python that was 10.0 m long. Sup-
pose a coordinate system large enough to measure the python's length is
drawn on the ground. The snake's tail is then placed at the origin and the
snake's body is stretched so that it makes an angle of 60.0° with the posi-
tive x-axis. Find the x and y coordinates of the snake's head. (Hint: The y-
coordinate is positive.)
Answer:
See below
Explanation:
Hypotenuse is snake length 10 m
y coordinate = 10 sin 60 = 8.7 m
x coordinate = 10 cos 60 = 5m
The makers of brand A hand sanitizer want to prove that their sanitizer kills more bacteria than the other 4 leading brands of sanitizer. They organize 60 test subjects into 6 groups of 10 test subjects. The test subjects participate everyday for one week, the data for the experiment is shown below where the final average number of bacteria still remaining is given.
Table 1. Effectiveness of Hand Sanitizer on Bacteria
[See Attached]
Please develop a CONCLUSION for this experiment.
Based on the results of the experiment, it can be concluded that the claim by Brand A that their sanitizer kills more bacteria than the other 4 leading brands of sanitizer is true.
What is an experiment?An experiment is a procedure carried out to support or refute a hypothesis, or determine the efficacy or likelihood of something previously untried.
The experiment is the foundation of the scientific method, which is a systematic means of exploring the world around us.
Experiments takes place in laboratories, but can also be performed anywhere at any time.
There are some steps in the scientific methods which includes:
Make observations.Formulate a hypothesis.Design and conduct an experiment to test the hypothesis.Evaluate the results of the experiment.Accept or reject the hypothesis.If necessary, make and test a new hypothesis.Considering the data table from the experiment:
The results of this study concur with brand A goals as hand sanitizers producers as product effectiveness has improved over time. The performance of brands A has indicated improved effectiveness as their claims has been found true with respect to other manufacturers of the sanitizer. This study showed that brand A hand sanitizers were tested and found more effective against selected brands.
In conclusion, the results of the experiments showed that in the comparison between the brands of hand sanitizers, brand A were most effective.
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In a longitudinal wave, the medium moves
left to right
up and down
in circles
In a longitudinal wave, the particles of the medium have to and fro motion about their mean motion, along the direction of wave motion.
Longitudinal waves are waves in which the displacement of the medium is in the same (or the opposite) direction as the wave propagation and the medium vibration is parallel ("along") to the direction the wave travels. Because they create compression and rarefaction when passing through a material, mechanical longitudinal waves are also known as compressional or compression waves. A nice illustration is a wave down the length of a stretched Slinky toy, where the space between the coils grows and shrinks. Examples from the real world include seismic P-waves and sound waves (which are oscillations in pressure, a particle's displacement, and a particle's velocity) (created by earthquakes and explosions).
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A tank of oxygen has 125 kPa of pressure. The pressure is increased to 200 kPa and the final volume is 0.5 L. What was the initial volume?
According to the given data initial volume =0.667 L
Why is it called Boyle's law?Boyle observed that the product of the pressure and volume are observed to be nearly constant. For a perfect gas, the result of volume and pressure is a precise constant. Boyle's Law is the name given to the relationship among pressure and volume in his honor.
Who discovered Boyle's law?Boyle was a modern chemical pioneer in the 17th century, best known for his law of gases. Robert Boyle (1627–1691) is credited with discovering the renowned Boyle's law, which states that a gas's volume decreases with rising pressure and vice versa
Briefing:Since the change occurs at constant temperature (i.e. an isothermal change), Boyle's law applies,
i.e. p[tex]_1[/tex]V[tex]_1[/tex] = p[tex]_2[/tex]V[tex]_2[/tex] where p[tex]_1[/tex] = 125 kPa, p[tex]_2[/tex] = 200 kPa and V[tex]_2[/tex]=0 .5L
Hence, (150)V[tex]_1[/tex] = (200)(0.5)
from which, volume V[tex]_1[/tex] = 200×0.5/150=0.6667L
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I need help with this question , thank you
Answer:
Should be 400m
Explanation:
How do you find the x and y components of a vector ?
Answer:
If you were given the vector in vectorial form, for example, <5,7>, then the first number (5) will always be the x component and the second number (7) is the y component.
In other cases, you are given the magnitude of the vector and the angle created by said magnitude with respect to the y or x axis. In these cases, you must use the magnitude and angle of the vector as if it was the hypotenuse of a right triangle and find the values of x and y as the legs of said triangle using the sine and cosine created by the magnitude of the vector and the value of said magnitude.
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Is it possible for an object to be accelerating and at rest at the same time? Explain.
Answer:
Yes
Explanation:
acceleration is a change in velocity, so an object might be momentarily at rest but a split-second later have some speed, i.e. it can be changing its velocity even if it is momentarily at rest.
Rattlesnake Frequency A timber rattlesnake (Crotalus horridus) shakes its rattle at a characteristic frequency of about 3100 shakes per minuteWhat is this frequency in shakes per second?
Answer:
See below
Explanation:
31 00 sh / min / 60 s / min = 51 2/3 shakes per second
The speed of a train increases from 100 km/hr to 250 km/hr in 5 minutes. What is its acceleration?
Answer:30 km/hr2 is the exal
Explanation:
2. How long will it take for a bicycle to travel across from point A to
point D as shown below in the figure if his velocity was 4 m/s. Hint: use
Pythagorean Theorem () to find your displacement. A²+ B² = (²
A
25m
B
25m
D
35m
C
V = & Devt T=B
Answer:
I guess equal to ABD
A car travels 60 m/s for 60 secs.
Calculate how far it traveled.
The formula for distance = speed * time
60 m/s is the speed.
60 secs is the time.
Fill them in.
distance = 60 * 60
distance = 3600
please give brainliest
Answer:
3600m
Explanation:
s= vt
= 60m/s × 60sec
=3600m
phys 181 check picture
Answer:
see below
Explanation:
a^3 = 125 m^3
b^2 = 8.41 s^2
c = 45 m/s Plug these values into the equation
125 / ( 8.41 * 45) = .33 m^2 / s
A float starts 9.2 m west of a grand stand ( the origin ) for the parade . It heads towards the grandstand at the rate of 1.5m/s . Where is the float located at 3.5s?
The float is 3.95 m west of the grandstand after 3.5 s of its start.
What is Distance in relation with physics?The distance is defined as the total length of the path taken by a moving body in order to reach the final position starting from initial position. Mathematically -
Distance [d] = Speed [s] x time [t]
Given that a float starts from 9.2 m west of a grand stand for the parade with the speed of 1.5 m/s. Therefore we can write -
Speed [s] = 1.5 m/s
Distance between float and grandstand [D] = 9.2 m
The location of the float after 3.5 seconds of its start is as follows-
d = s x t
d = 1.5 x 3.5
d = 5.25
Therefore -
Distance between the float and the grandstand after 3.5 seconds of its start = D - d = 9.20 - 5.25 = 3.95 m
Therefore, the float is 3.95 m west of the grandstand after 3.5 s of its start.
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What is the average velocity of the object?
______ m/s
Answer:
0.1 m/s (or 100 cm/s)
Explanation:
At the first point on the graph’s faded grid, the object has traveled 1 meter in 10 seconds. At the next point, the object traveled 2 meters in 20 seconds. This is a 1 to 10 ratio, or 1/10, which is 0.1 in decimal format.
Question 4 of 10
Which of the following describes the reactants of a chemical reaction?
OA. The chemicals on the right side of a chemical equation
B. The substances that are formed
OC. The substances that are made
O D. The chemicals on the left side of a chemical equation
The substances that are altered and the chemicals on the right side of a chemical equation are the results of a chemical reaction. B and D are the appropriate choices.
Reactants are the substance(s) in a chemical equation to the left of the arrow. A component that is present at the outset of a chemical reaction is known as a reactant. Products are the substance(s) to the right of the arrow. A substance that remains after a chemical reaction is complete is known as a product. The creation of products from the reaction of two reactants is known as a chemical reaction. The compounds that result from a reaction are called products. The substances that are original materials are the reactants.
On the left side of the reaction are the reactants, and on the right are the products. B and D are the proper choices as a result.
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When water boils, is it steam or water vapor?
Answer:
It is water vapor.
Explanation:
When water boils, it is changing state from a liquid to a gas.
Answer: It is water vapor. When water boils, it is changing state from a liquid to a gas.
Explanation:
If one pound of force acts through a distance of two feet, one foot-pound of work is done.
True
False
It is false that if one pound of force acts through a distance of two feet, one foot-pound of work is done.
What is work?Work is a measure of energy expended in moving an object. It is most commonly calculated by multiplying the force by distance.
It is said that no work is done if the object does not move.
According to this question, if one pound of force acts through a distance of two feet, a work of one pound-two feet is done.
It is therefore, false that if one pound of force acts through a distance of two feet, one foot-pound of work is done.
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