PHYSICS HIGH SCHOOL

if a 1000 kg car is sent toward a cement wall with a speed of 14m/s and car stops in .08 seconds. What's the average force exerted on the car/

Answers

Answer 1

Answer:

Answer:175000N

Explanation:f=m(v-u)/t

F=1000(14-0)/0.08

F=(1000×14)/0.08

F=14000/0.08

F=175000N

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Einstein's famous equation indicates that E=mc^2, where c is the speed of light and m is the object's mass. Given this, what is the SI unit for E?

Answers

Answer: Joules

Explanation:

Einstein's equation is:

$E=mc^(2)$

Where:

$E$ is the energy

$m$ is the mass and its SI unit is kilogram $kg$

$c$ is the speed of light and its SI unit is meters per second $(m)/(s)$

If we input the units in the equation and make the analysis of the units:

$E=kg{((m)/(s))}^(2)=kg (m^(2))/(s^(2))$

Rearranging the units:

$E=kg (m)/(s^(2))m$

As we know 1 Newton is $1 N=kg (m)/(s^(2))$

$E=Nm$

And 1 Joule is $1J=Nm$

$E=J$ This is correct because the Joule is the SI unit for energy

A runner is at the starting line and hears the starting gun. He starts running from rest with a constant acceleration ai = 0.53 m/s2. He crosses the finish line at d = 100 m and then begins slowing down. It takes him a time interval tr to cross the finish line. It takes him a time interval ts = 7.5 s to return to rest after crossing the finish line. Use the given coordinate system where x is positive to the right. a)Enter an expression for the time, tr, it takes for the runner to cross the finish line, in terms of d and ai

Answers

To find the time, tr, it takes for the runner to cross the finish line, we can use one of the kinematic equations that relate displacement, initial velocity, acceleration, and time. Since the runner starts from rest, his initial velocity is zero, so we can use the equation:

Δx=v0t+21at2

where Δx is the displacement, v0 is the initial velocity, a is the acceleration, and t is the time. Plugging in the given values of Δx=d, v0=0, and a=ai, we get:

d=0+21ait2

Solving for t, we obtain:

t=ai2d

This is the expression for the time, tr, it takes for the runner to cross the finish line, in terms of d and ai.

Which of the following best describes the fate of energy in ecosystems?

Answers

The fate of energy in ecosystems is for it to be lost as heat. Energy "flows" through the ecosystem in the form of carbon-carbon bonds. When respiration occurs, the carbon-carbon bonds are broken and the carbon is combined with oxygen to form carbon dioxide. This process releases the energy, which is either used by the organism (to move its muscles, digest food, excrete wastes, think, etc.) or the energy may be lost as heat.All energy comes from the sun, and that the ultimate fate of all energy in ecosystems is to be lost as heat.

Answer:

It's best to also include the options since this is a multiple choice question! But the best answer would be D.

Explanation:

It flows through and is used by ecosystems.

If Earth were twice as far from the sun, the force of gravity attracting the Earth to the Sun would bea. twice as strong
b. half as strong
c. one-quarter as strong.

Can someone explain this one for me ? :)

Answers

one quater as your moving away more!

In a closed system, a cart with a mass of 1.5 kg is rolling to the right at 1.4 m/s, while another cart of mass 1.0 kg is rolling to the left at the same speed. What is the total momentum of the system of two carts?a. 0.0 kgm/s

b. 0.50 kgm/s

c. 0.70 kgm/s

d. 3.5 kgm/s