1. A motorist whose car is out of gas pushes his car at a steady speed of 0.75 m

Question

1. A motorist whose car is out of gas pushes his car at a steady speed of 0.75 m/s with a force of 200 N. What power does he deliver to the car?

2. Ayeka exers a force of 186 N on a lever to raise 2.70 x 103-N object to a height of 29.0 cm. If the efficiency of the lever is 83.3 percent, how far does Ayesha move her end of the lever?

3. If a bowling ball and a marble are dropped frrom the same height and have the same speed at any time during their fall, why would you rather have a falling marble hit you on the nose than a bowling ball?

4. In the collision of two billiard balls, one ball moves from east to west and impacts a second ball that is initially at rest. That second ball moves northeast to southwest, while the first ball continues on its east-west path. Is this possible? Why or why not?

5. The Voyager spacecraft are the fastet objects ever launched from Earth. They escaped Earth's gravitational pull and rocketed off past the farthest planets. Their heigh above Earth is now many hundreds of millions of miles, yet their kinetic energy is still very high. Doesn't this violate the law of conservation of energy?

Explanation / Answer

1) Given that Force F = 200 N

speed is V = 0.75 m/sec

Power is P = F*V = 200*0.75 = 150 W

Related Questions

Navigate

• Browse (All)
• Browse 1
• Subjects

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.