A rocket traveling at 80 m/s is accelerated uniformly to 152 m/s over a 18 s interval. What is its displacement during this time?

Answers

Answer 1

Answer:

Recall that with constant acceleration,

$x_f-x_i=\frac{v_i+v_f}2t$

where $x_f-x_i$ is the rocket's displacment, $v_i$ is its initial velocity, $v_f$ its final velocity, and $t$ is time. So

$x_f-x_i=\frac{80(\mathrm m)/(\mathrm s)+152\,(\mathrm m)/(\mathrm s)}2(18\,\mathrm s)=2088\,\mathrm m$

or just 2100 m if taking significant digits into account.

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Whenever the motion of an object change,____ has been applied.

Answers

Whenever the motion (speed or direction) of an object changes, we say that acceleration has occurred. From Newton's First Law of Motion, we know that force has been applied to the object.

Which of the following statements accurately describes the properties gases

Answers

It may be, A change in the pressure of a gas results in a more significant change in volume than would occur in a liquid. I’m not for sure because I’m still studying this, but I think I correct but correct me if I’m wrong so that I can know and figure out what is the correct answer. Thank you

a classmate states that continental drift could not be possible because it would take far too much force to move tectonic plates. describe the hypothesis scientists use to explain the movement of tectonic plates. which hypothesis do money scientist things may explain the great force needed to move plates

Answers

Seafloor Spreading is how the plates move. It is a process in which new oceanic crust (ocean floor) is created from the hot magma that comes to the surface. The magma is cooled by the water. The new floor pushes outward and moves the old floor. This is the force that causes the plates to shift. Harry Hess came up with this theory. John Tuzo Wilson combined Alfred Wegener's theory of continental drift and Harry Hess's theory of seafloor spreading to create a reasonable explanation for how the plates could have moved then created his own theory of plate tectonics.

A 2.00x10^6 hertz radio signal is sent a distance of 7.30x10^10 meters from earth to a spaceship orbiting Mars. How much time does it take for the radio signal to travel from earth to the spaceship

Answers

Answer:

It takes $2.43* 10^2$ for the radio signal to travel from earth to the spaceship.

Explanation:

Given:

The frequency of the radio signal = $2.00 * 10^6$ hertz

Distance = $7.30* 10^10$ meters

To Find:

The time taken for the radio signal to travel from the earth to the spaceship= ?

Solution:

we know that the time taken can be found by dividing the distance travelled by the speed at which the signal travels

$Time = (Distance)/(Speed)$

Here the speed of the radio signal is equal the the speed of light

Now substituting the values,

Time taken is

=> $Time = (7.30* 10^10)/(3 * 10^8)$

=> $Time = 2.43* 10^(10-8)$

=> $Time = 2.43* 10^2$

The time taken for the 2×10⁶ Hz radio signal to get to the spaceship from Earth is 243.33 s

What is speed?

Speed is the distance travelled per unit. Mathematically, it can be expressed as:

Speed = distance / time

How to determine the time

Speed of radio signal = 3×10⁸ m/s
Distance = 7.3×10¹⁰ m
Time =?

speed = distance / time

3×10⁸ = 7.3×10¹⁰ / time

Cross multiply

3×10⁸ × time = 7.3×10¹⁰

Divide both sides by 3×10⁸

Time = 7.3×10¹⁰ / 3×10⁸

Time = 243.33 s

Learn more about speed:

brainly.com/question/680492

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A foot strikes the floor with a force of 520N at an angle of 20 degrees. what is the friction force exerted by the foot?

Answers

Answer:

Friction force on the ground is 488.6 N

Explanation:

As we know that the force of reaction which is along the horizontal surface in tangential direction is known as Friction force while other perpendicular component of the force is Normal force

Here we know that force is inclined at 20 degree with the horizontal

so we have

$F_f = F cos\theta$

here we know

F = 520 N

$\theta = 20 degree$

so we have

$F_f = 520 cos20$

$F_f = 488.6 N$

HELP ASAP REAL ANSWERS PLEASE You push a box across the floor with a force of 30 N. You push it 15 meters in 8 seconds. How much work did you do? How much power did you use?

Answers

When you lift a box up off the floor, you must exert a force at least equal to the weight of the box. If you lift the box at constant speed, you "do work" on the box that would be equal to the force you exert (the weight of the box) times the height through which you lifted the box. If you exert a force of 50 Newtons on the box and lift it 1 meter high, then you did (50 N)x(1 m) or 50 N-m of work on the object. 1 Newton-meter is called a Joule (J), pronounced "jewel." In lifting the 50 N box upward 1 meter at constant speed, you would do 50 Joules of work on the box. That means your body used 50 J of energy to lift the box.

and here is the Equation for Work: Work = Force x distance, or W = F d.

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