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3 years ago

9

To avoid an accident, a driver steps on the brakes to stop a 1000kg car traveling at 65km/h. If the braking distance is 35m, how

much force is necessary to stop the car?

1 answer:

Alenkinab [10]3 years ago

8 0

To stop the car it would be 100m because if the car is going to 65km/h then it would still be 100km/h

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Select the correct answer.

Bumek [7]

Answer:

B. 2 Hours

Explanation:

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An object with a temperature of 0 Kelvin would not emit radiation.<br> a. True<br> b. False

dem82 [27]

That's true.
Radiation always carries energy.
An object at 0 K doesn't have any.

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A person uses a constant force to push a 14.0 kg crate 1.80 m up a frictionless 10⁰ incline and to also increase its speed from

zubka84 [21]

a) Making h as the shorter cathetus, we have,

$h=1.8*sin10=0.312$

We proceed to calculate the work done by gravity

$W_g=-mgh$

$W_g=-140*0.312=-43.76J$

b) It's necessary to calculate the Kinetic Energy, we use the equation of KE,

$\Delta KE = \frac{1}{2}m(v_2^2-v_1^2)$

$\Delta KE = \frac{1}{2}14(1.5^2-0.5^2)=14J$

c) By work energy theorem

$W_{net}=\Delta KE \rightarrow W_net = 14J$

d) we calculate net work through the law of conservation

$W_{net}=W_f+W_g=14$

$\rightarrow W_f = 14-W_g=14-(-43.76)$

$W_f=57.76J$

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4 years ago

Which of the three types of equations follows the law of conservation of mass?

ArbitrLikvidat [17]

Answer:

BE MORE DESCRIPTIVE

Explanation:

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3 years ago

What is a law which states energy cannot be created of destroyed only transferred

dlinn [17]

Answer:

The law of conservation of energy

Explanation:

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