Question

I.-Solve the next problems using your knowledge and the formulas for each topic. (remember, show
your work) 8 pts.
1. An object with a mass of 25kg accelerates 3.5 m/s2 when an unknown force is applied to it.
What is the amount of the force?

2. The hubble space telescope has a mass of approximately 11600 kg. What is the force on
a 150-kg suited astronaut if it is 28m from the center of mass of the telescope?

3. A 250 kg motorcycle is moving with a kinetic energy of 20 000 J. Estimate its velocity.

4. A ball falls down 7 meters from the top of a building. If the ball of 3.5 kg, what is the
gravitational potential energy lost by the ball? Estimate g as 9.8

5. If the total mechanical energy of a swinging pendulum is 360 J, and its mass is 18.0 kg,
what is the maximum height reached?

6. A microwave oven does 26,000 joules of work in 20 seconds. Then the power of the
microwave is:

7. An object has a mass of 1500g and a volume of 2500 cm . Calculate its density.

3

8. A man is standing on one foot, and this foot is applying 620N to the ground. As a result,
this foot is exerting 1,212 N/ m of pressure onto the ground. What is the surface area of

2
the bottom of his foot?

Answer 1

Respuesta:

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