The gravitational force that the Earth exerts on the Moon is equal and opposite to that which the Moon exerts on the Earth. Therefore, according to Newton's second law of motion,
A) the Moon and the Earth both have equal accelerations, because the forces are equal.
B) the Moon has a larger acceleration than the Earth, because it has a smaller mass.
C) the Earth has a larger acceleration than the Moon, because it has a larger mass.
B
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A 20-g bullet moving at 1000 m/s is fired through a one-kg block of wood emerging at a speed of 200 m/s. What is the change in the kinetic energy of the bullet-block system as a result of the collision assuming the block is free to move?
a. 0 J c. 9.5 kJ b. -9.5 kJ d. -18 J
At a distance of 4.3 cm from the center of a very long uniformly charged wire, the electric field has magnitude 2000 N/C and is directed toward the wire
What is the charge on a 1.0 cm length of wire near the center? (?0 = 8.85 × 10-12 C2/N ? m2) A) -0.056 nC B) -0.044 nC C) -0.048 nC D) -0.052 nC
The Sun is gradually increasing in brightness as it ages. Why isn't this considered to be an explanation for global warming?
A) A change in the Sun's brightness would not be expected to have any effect on Earth's average temperature. B) The scientists are covering up this potentially valid explanation. C) The amount of energy the Earth receives from the Sun remains constant regardless of what the Sun does. D) The Sun is increasing in brightness much too slowly to be causing the current warming.
A rocket with a mass of 2.0 × 106 kg is designed to take off from the surface of the earth by burning fuel and ejecting it with an exhaust speed of 3500 m/s
What is the minimum rate at which the fuel should be consumed in order to attain liftoff? A) 5.6 × 103 kg/s B) 1.4 × 103 kg/s C) 1.8 × 103 kg/s D) 2.8 × 103 kg/s E) 18 × 103 kg/s