9. An 10.0 g bullet, moving at 200 m/s, goes through a stationary block of wood in 3.0x10–4 s, emerging at a speed of 200 m/s.

(a) What average force did the wood exert on the bullet?

(b) How thick is the wood?

10. An artificial Earth satellite, of mass 3.00 * 103 kg, has an elliptical orbit, with a mean altitude of 500 km.

(a) What is its mean value of gravitational potential energy while in orbit?

(b) What is its mean value of orbital kinetic energy?

(c) What is its total energy while in orbit?

(d) If its perigee is 150 km, what is its orbital velocity at perigee?

Q3 A positive charge of 3.2 x 10-5 C experiences a force of 4.8n to the right when placed in an electric field. What is the magnitude and direction of the electric field at the location of the charge?

Q4 What is the gravitational field intensity at the surface of Mars if a 2.0kg object experiences a gravitational force of 7.5 N?

Q6 What is the gravitational field intensity at a distance of 8.4 x 107 m from the centre of Earth?

Q7 Find the electric potential energy stored between charges of +2.6 μC and -3.2 μC placed 1.6m apart

Q9 A pair of metal plates, mounted 1.0cm apart on insulators, is charged oppositely. A test charge of +2.0 μC placed at the midpoint, M, between the plates experiences a force of 6.0 x 10-4 N [W]

a. what is the electric field intensity at M?

b. what is the electric field intensity at a point 2.0mm from negative plate?

c. what is the electric field intensity at a point 1.0mm from the positive plate?

d. what are two possible ways in which you could double the strength of the electric field?

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