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Lilit [14]
4 years ago
7

When a object is at rest, what is it’s speed??

Physics
2 answers:
Firdavs [7]4 years ago
7 0

Answer:

the speed when object at rest is 0 m/s

nadya68 [22]4 years ago
3 0

Answer:

0   (there is no speed)

Explanation:

If an object is at rest, it is not moving, and it doesn't have a speed, so the speed is zero.

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3 years ago
An 1120 kg car traveling at 17 m/s is brought to a stop while skidding 40 m. Calculate the work done on the car by friction forc
sergij07 [2.7K]

Answer:

Approximately (-1.6 \times 10^{5}\; \rm J) (assuming that the car was on level ground.)

Explanation:

When an object of mass m is moving at a speed of v, the kinetic energy of that object would be (1/2) \, m \cdot v^{2}.

Initial kinetic energy of the car:

\begin{aligned}&\frac{1}{2}\, m \cdot v^{2} \\ &= \frac{1}{2}\times 1120\; \rm kg \times (17\; \rm m \cdot s^{-1})^{2} \\ &\approx 1.6\times 10^{5}\; \rm J \end{aligned}.

After the car comes to a stop, the kinetic energy of this car would be 0\; \rm J because the car would not be moving.

Change to the kinetic energy of the car: \text{Final KE} - \text{Initial KE} = -1.6 \times 10^{5}\; \rm J.

If the car is traveling on level ground, friction would be the only force that contributed to this energy change. Hence:

\text{Work of friction} = \text{Energy change} = -1.6\times 10^{5}\; \rm J.

The value of the work that friction did is negative. The reason is that at any instant before the car comes to a stop, friction would be exactly opposite to the direction of the movement of the car.

The work of a force on an object is the dot product of that force and the displacement of that object. The dot product of two vectors of opposite directions is negative. Hence, in this question, the work that friction did on the car would be negative because the friction vector would be opposite to the movement of the car.

6 0
3 years ago
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Answer:

D.   Satin Cloth

Explanation:

i thought it said glass, not grass lol

satin it the smoothest surface and therefore the least amount of friction.

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The balloon prohibits the flow of air through the air capacitor.

Explanation:

Just like an electric capacitor has an insulator between the plates, the air capacitor has a balloon between the chambers.

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Animals like bats and whales use something called echolocation (sounds or echoes that travel to the other animal) these echoes can let one animal let another one know that danger is near or that food is nearby etc it's like a telephone line
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