part 1 of 2
A runner is jogging in a straight line at a
steady u, 2.2 km/hr. When the runner is
L 4 km from the finish line, a bird begins
flying straight from the runner to the finish
line at v= 6.6 km/hr (3 times as fast as the
runner). When the bird reaches the finish
line, it turns around and flies directly back to
the runner.
24
finish
line
L
What cumulative distance does the bird
travel? Even though the bird is a dodo, as-
sume that it occupies only one point in space
(a "zero" length bird), travels in a straight
line, and that it can turn without loss of
speed.
Answer in units of km.
Answer in units of km

The average speed you must run is 7.97 mph.

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

t1 = 18.5 / 19.1

t1 = 0.97 hour

t2 = 1.66 hr - 0.97 hr

t2 = 0.69 hr

v = 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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Answer:

An electric field has a magnitude of 400 N/C and makes an angle

60

o

with the perpendicular to the surface of a flat surface of dimensions 30 cm by 20 cm. Calculate the electric flux through the surface.

Explanation:

During the first two minutes of flight, the SRB and main engine accelerate at a rate of 52.16 m/s2.

Acceleration: the rate at which the speed and direction of a moving object vary over time. A point or object going straight ahead is accelerated when it accelerates or decelerates. The provided parameters are the engine's initial velocity (u), its end velocity (v), and the time of motion (t), which is equal to two minutes (2 x 60 s).

Following are the calculations for the main engine and SRB's acceleration.

a= Δv / Δt

a=7600-1341 /2*60s

a=52.16 m/s²

Consequently, 52.16 m/s2 is the acceleration of the main engine and SRB during the first two minutes of flight.

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This is based on probability since it is obvious that I have 4 apples if I take away 4 of them.

Gonna determine how likely something is to occur, use probability. Many things are hard to predict with 100% certainty. We can only forecast how likely an event is to occur using it, or how likely it is to occur..

provided the information; one apple. 5–4=1. Your teacher is looking for this response.

According to given information;

The four apples you took total four. Probably the one you want is this.

No apples; they were taken from you.

You gave your friend the entire crop of apples.

The fruits you discarded had worms, therefore you got zero apples.

a trio of apples. You missed one.

One apple. You ate two and cut up one of them for a salad.

Five apples. You had 5 apples and you took 4 of your own.

Five apples. You already had an apple.

Six apples. You already had two apples.

Seven apples. You already had three apples.

Eight apples. You already had four…

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T=3.12 Sec

Distance d= 9.703m

The distance can refer to a physical length in physics or to an estimate based on other factors in ordinary language (e.g. "two counties over"). It is sometimes used to indicate the distance between two points: display style |AB||AB|. The terms "distance from A to B" and "distance from B to A" are frequently used interchangeably.

It is a generalization of the idea of physical distance. Distance is a non-numerical measurement in psychology and the social sciences; psychological distance refers to how an object feels.

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The graph C best describes the cliff jumper's vertical displacement as shown in the attachment.

The initial vertical velocity of the cliff jumper would be zero as the cliff jumper runs off the cliff horizontally. As he jumps off, he is subjected to gravitational pull. This increases his velocity with respect to time.

During some of the initial time, the displacement would be lesser as his velocity increases with increase in time. Also the graph is in the 4th quadrant because the vertical displacement is downwards ( Negative ) as the time increases ( Positive ).

Therefore, the graph with a curve that lies in 4th quadrant with a lesser initial displacement is the correct answer.

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Answer:

See below

Explanation:

In absolute temperature   80 F = 299.82 K

   1/2 of this is 149.9 K   = - 189.84 degrees F

- 189.84° F is the temperature of an object where it is half as hot as 80°F. A thermometer or even a calorimeter can be used to measure it.

The temperature of a thing is an absolute measure as to how warm or cold it is. A thermometer or even a calorimeter can be used to measure it. It is a method for determining actual internal energy of a particular system.

Temperature is an aspect of reality which we have a reasonably intuitive grasp on since humans easily detect the quantity of heat and cold inside an area. Although the two notions are related, temperature is distinct from heat. Temperature is a measurement of a system's intrinsic energy.

In absolute temperature  

80 F = 299.82 K

1/2 of this is 149.9 K   = - 189.84° F

Therefore, - 189.84° F is the temperature of an object where it is half as hot as 80°F.

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Answer:

The computer uses 5 of these they are mechanical, sound, heat, light, and electric energy.

Explanation:

hope this helps

Considering the definition of speed, the average speed is 431.94 m/s.

Speed ​​is a physical quantity that expresses the relationship between the space traveled by an object and the time used for it.

In other words, the speed is associated with the change of position of an object in space within a certain amount of time.

The speed can be calculated using the expression:

speed= distance traveled÷ time

In this case, you know that:

Replacing in the definition of speed you can calculate the time it takes to fly away and back:

Solving:

Then, the total distance traveled and the total time will be the sum of each of the sections traveled:

Replacing in the definition of speed:

speed= 1,156,000 m÷ 2,676.32 s

Solving:

speed= 431.94 m/s

Finally, the average speed is 431.94 m/s.

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The block's oscillation frequency is 1.1 Hz.

The block's distance from equilibrium when the speed is 57 cm/s  is 14.2 cm.

The block's distance from equilibrium at t = 7.0 s  is 10.37 cm.

The oscillation frequency of the block is calculated as follows;

f = 1/2π√(k/m)

f = 1/2π √(9/0.19)

f = 1.1 Hz

ω = 2πf

ω = 2π x 1.1

ω = 6.91 rad/s

x(t) = A cos(ωt + Φ)

ωX sin(Ф) = v

6.91 x 29 sin(Ф) = 116

sin(Ф) = 116/200.39

sin(Ф) = 0.579

Ф = arc sin(0.579)

Ф = 0.62 rad

29 = A cos(6.91 x 0  +  0.62)

29 = A cos(0.62)

29 = A(0.814)

A = 35.63 cm

when the speed is 57 cm/s, the distance of the block is calculated as follows;

ωX sin(Ф) = v

(6.91)X sin(0.62) = 57

X(4.015) = 57

X = 57/4.015

X = 14.2 cm

x(t) = A cos(ωt + Φ)

x(7) = 35.63 cos(6.91 x 7   +  0.62)

x(7) = 10.37 cm

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The entire motion of an object, regardless of direction.

In physics, motion is that the phenomenon in which an object changes its position with respect to time. Motion is mathematically described in terms of displacement, distance, velocity, acceleration, speed, and frame of regard to an observer and measuring the change in position of the body relative to that frame with change in time. The branch of physics describing the motion of objects without regard to their cause is called kinematics, while the branch studying forces and their effect on motion are named dynamics.

If an object isn't changing relative to a given frame of reference,  the thing is said to be at rest, motionless, immobile, stationary, or to possess a constant or time-invariant position with reference to its surroundings. Modern physics holds that, as  there's no absolute frame of reference, Newton's concept of absolute motion can't be  determined

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Answer:

m is expressed in kilograms and r in metres, with I (moment of inertia) having the dimension kilogram-metre square.

Answer:

here's the answer

Explanation:

given:

h= 20.0m

M= 12.0kg

g=10m/s²

solution:

potential energy = mgh = (12.0kg)(10m/s²)(20.0m)

= 2400

potential energy = 2400J

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The weight of sulphuric acid in the acid is 488.3 grams.

Specific gravity is a comparing tool used to compare weight of a specific liquid when compared to same unit of water as standard substance.

Specific gravity can be defined as the ratio of the density of a substance to that of a standard substance. Water being the standard substance here.

Let us consider the weights for 1 Liter of acid

Weight of 1 liter of water is 1000gram

Therefore weight of 1 liter of acid=1.285 x 1000 =1285 gram

It is given that the acid is 38 percent by weight of sulphuric acid

Therefore, weight of sulphuric acid= 38% of 1285 gram

weight of sulphuric acid = 38/100 x 1285

                                         =488.3 gram

Therefore, weight of sulphuric acid in the acid is 488.3 gram

Hence, the weight of sulphuric acid in the acid is 488.3 grams

Disclaimer:

Quantity of acid has not been mentioned and hence 1 liter has been taken as the quantity.

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The distance covered by the train will be 75 meters.

Physics equations called equations of motion describe how a physical system acts in terms of how its motion alters over time.

The equations of motion, which are a group of mathematical functions stated in terms of dynamic variables, provide a more thorough description of how a physical system behaves.

Given that a train changes its velocity from 70km / h to 20km / h in 6 s.

Use the first equation of motion:-

V= U + at

20 = 70 + ( 1 / 600)a

-50 = ( 1 / 600)a

a = -30000

Use another equation of motion:-

V² = u² + 2as

20² = 70² + 2 ( -30000)S

400 - 4900 = -60000S

-4500 = -60000S

S = -4500 / -60000

S = 0.075 KM

S = 75 meters

Therefore, the distance covered by the train will be 75 meters.

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The cost of operating it through the night is $0.96.

We know that the electrical current is obtained by the use of the formula;

P = IV

P = power

V = voltage

I = current

I = P/V

I = 1500 W/110 V

I = 13.6 A

Now;

The power in kW = 1.5 kW hence the energy used in 1 hour is 1.5 kWhr

If the cost of 1 kWhr = $0.08

Then 1.5 kWhr costs =  1.5 kWhr  * $0.08/1 kWhr

= $0.12

To operate it all through the night = 8 * $0.12  = $0.96

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As per the given question;

On a dry day, a mirror or window polished with a dry cloth quickly develops dust. Dry cloth friction on glass produces charged static electricity, which attracts microscopic non-charged dust particles.

Static electricity can cause problems or even pose a risk. Your hair standing on end energy can also destroy electronics and cause explosions. However, it can also be a huge asset to modern life when properly managed and manipulated.

When the positive and negative charges are out of balance, static electricity is produced. While electrons like to jump all over the place, protons and neutrons don't move around that much. A negative charge is present when an object (or person) has extra electrons.

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The mass is moving with an acceleration of 13.299 m/s².

The rate at which an object's velocity with respect to time changes is referred to as acceleration in mechanics. They are vector quantities, accelerations.

According to therefore mentioned statement,

the direction of the net force applied on an object determines its acceleration;

according to mentioned data;

F₁=30N

F₂=10N

Net force on object;

F=F₁+F₂

F=F₁y+F₂Cos30°(-x)+F₂ Sinx(-y)

F=3y+10×(√3/2)(-x)+10×(1/2)(-y)

F=ma

ma=-5√3/2(x)+25y

2a=-5√3x/2+25y

a=-5√3x+25y

magnitude(a)=√(-5√3/2)²+(25/2)²

     (a) =13.299m/s²

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The correct answer is nuclear fusion, radiation, and conduction.

It is a nuclear process in which energy is produced by colliding light atoms. It is the opposite of fission, which results in the disintegration of heavy isotopes. The sun and other stars produce light and heat through fusion.

According to the energy of the emitted particles, radiation is frequently classified as either ionising or non-ionizing. More than 10 eV is often carried by ionising radiation, which is sufficient to ionise atoms and molecules and rupture chemical bonds.

Conduction is an observable occurrence in all states of matter and is the process of transmitting energy through the motion of particles in touch with one another (solids, liquids and gases). Conductors are substances that permit conduction. Conduction is divided into three categories: conduction of heat, conduction of electricity, and conduction of sound.

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Fan B has an efficiency of 55% and usefully transfers 10J of energy to its kinetic energy store each second. 18.18 J of energy is supplied to fan B per second.

Efficiency is the capacity to do a task with little or no wastage, effort, or energy. Being effective is maximizing the use of the resources at your disposal to achieve your objectives. Simply put, something is efficient if there is no waste and every process is optimized.

To calculate the input energy use the following formula

Efficiency = Energy(out) / Energy(in) * 100%

Efficiency = 55%

Energy(out) = 10J

Energy(in) = ?

On putting the given values we get,

55 = Energy(in) / 10 * 100%

On solving we get,

Energy(in) = 18.18J

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Answer:

hope it help

Explanation:

E1=2Ecosθ=[x2+l2]3/22kq(l)   alongAC;E2=2Ecosθ=[x2+l2]3/22kq(l)   alongDB

So, E1⊥E2. Net field is

E0=E12+E22=[x2+l2]3/222kql=2πε0[x2+l2]3/2ql

The magnitude of the electric field at the center of the square is[tex]√(2 * k * |Q| / L^2).[/tex]

Electric field is a physical field that surrounds electrically charged particles and exerts force on other charged particles within the field. It is defined as the force per unit charge experienced by a test charge in the field.

The magnitude of the electric field at the center of the square is given by the formula:

[tex]E = kQ/2L^2[/tex]

where k is the Coulomb constant.

The distance from the center of the square to each vertex is [tex]L/√2.[/tex]

The electric field due to the charges at the vertices with charge Q is:

[tex]E1 = kQ/(L/√2)^2 = 2kQ/L^2[/tex]

The electric field due to the charges at the vertices with charge -Q is:

[tex]E2 = k(-Q)/(L/√2)^2 = -2kQ/L^2[/tex]

The net electric field at the center of the square is:

[tex]E = E1 + E2 = 2kQ/L^2 - 2kQ/L^2 = 0[/tex]

Therefore, the magnitude of the electric field at the center of the square is zero.

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Explanation:

Q=mc(T2-T1)

or

q = mcΔT ,

where m is the mass of the sample,

c is the specific heat,

and ΔT is the temperature change.

Q=2.0 × 2000 × 5

Q=20000J⋅kg −1 ⋅K −1

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Answer:

In a freezer, the air molecules absorb energy from the water, causing the water molecules to freeze into a solid.

Answer: Water expands when it freezes. As freezing continues, the expanding ice under the surface forces the remaining water up through the hole and it freezes around the edge forming a hollow spike

Explanation:

Water expands when it freezes. As freezing continues, the expanding ice under the surface forces the remaining water up through the hole and it freezes around the edge forming a hollow spike. Eventually, the whole thing freezes and the spike is left.

The horizontal displacement of the backpack as it falls is 765 m.

From the question given above, the following data were obtained:

The horizontal displacement of the backpack can be obtained as follow:

s = ut

s = 85 × 9

Horizontal displacement = 765 m

From the calculation made above, we can see that the horizontal displacement (i.e distance from the car) were the backpack will land is 765 m. Thus, the backpack will not land on your car. Hence, you do not need to move the car.

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Answer:

See below

Explanation:

Distance covered = 400 + 200 = 600 km

displacement =   400 w   -  200 e  = 200 km  west

d = M/V, where d is density, M is mass, and V is volume, is the formula for density. Grams per cubic centimeter are a typical unit of measurement for density.

To fill the graduated cylinder to the 2.0 mL mark, add water. The water makes a curve if you see the graduated cylinder from the side. Make sure the 2.0 mL level is at the bottom of the curve. Calculate the graduated cylinder's mass and the water's mass in milliliters using the gram scale. In the table, note the mass. Subtract the graduated cylinder's mass to determine the mass of 2.0 mL of water. To find and note the mass of 4.0 mL of water, repeat this procedure.

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The number of significant figures in the following product: 0.005032 x 4.0009 is 9.

Significant figure is a figure that is meaningful with respect to the precision of a measurement.

It is a digit that is nonzero, followed by a nonzero digit, or (for trailing zeroes) justified by the precision of the derivation or measurement.

According to this question, the product of 0.005032 x 4.0009 is as follows: 0.0201325288

The result of this product is as follows:

Therefore, the number of significant figures in the following product: 0.005032 x 4.0009 is 9.

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Answer:

No

Explanation:

The chemical identity of the substance is the same. The substance is merely in a different state.

Answer:

pascal

energy,

power,

electric charge,

Explanation: