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?

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?
Q10 When an 80.0 V battery is connected across a pair of parallel plates, the electric field intensity between the plates is 360.0N/C.
a. What is the distance of separation of the plates?
b. What force will be experienced by a charge of -4.0 μC placed at the midpoint between the plates?
c. Calculate the force experienced by the charge in part (b) if it is located one quarter of the way from positive plate.
Q11 Two large horizontal parallel plates are separated by 2.00cm. an oil drop, mass 4.02 x 10-15kg, is held balanced between the plates when a potential difference of 820.0V is applied across the plates, with the upper plate being negative
a. what is the charge on the drop?
b. what is the number of excess or deficit electrons on the oil drop?
Q12 A proton is projected into magnetic field of 0.5T directed into the page. If the proton is travelling at 3.4 x 105 m/s in a direction [up 28o right], what is the magnitude and direction of the magnetic force on the proton?
6. A 2.4 ´ 10–3-C positive test charge is placed between two plates. The potential difference between two parallel metal plates is 30 V. Plate A is positive and plate B is negative. Which plate has a higher electric potential?
a.
plate A
b.
plate B
c.
Plates A and B have the same potential.
d.
If the positive charge is placed closer to the positive plate, then plate A will have a greater electric potential.
e.
If the positive charge is placed closer to the negative plate, then plate B will have a greater electric potential.
8. a. Calculate the electric field 2.0 m from a small sphere with a positive charge of 2.3 ´ 10–3 C.
b. Charged spheres X and Y are in a set position and have charges and , respectively. Calculate the net force on sphere Z, of charge .