A cannonball has more kinetic energy than the recoiling cannon from which it is fired because the force on the ball
A) is more concentrated.
B) meets less resistance than the cannon on the ground.
C) acts over a longer distance.
Answer: C
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The graphs below show the phasors ?Vmax and Imax for five RLC series circuits. The solid arrows represent the voltage phasors, ?V, and the dashed arrows represent the current phasors, Imax. Which graph represents a circuit where the inductive reactance is greater than the capacitive reactance?
A.
B.
C.
D.
E.
What buoyant force is exerted by water on a 0.60-kg solid gold crown when it is immersed in water? The density of gold is 19.3 × 103 kg/m3 and that of water is 1000 kg/m3
A) 3.0 × 10-5 N B) 3.0 × 10-4 N C) 3.0 × 10-2 N D) 0.30 N
A light ray in air strikes a glass plate whose index of refraction is 1.42. Some of the light reflects off the surface of the plate, but most of it enters the glass
If the angle of refraction is one-half the angle of reflection, the angle of refraction is closest to which one of the following angles? A) 45° B) 43° C) 41° D) 39° E) 37°
Three Carnot engines operate between temperature reservoirs as follows: Engine A: Th = 1 100 K, Tc = 1 000 K; Engine B: Th = 550 K, Tc = 500 K; Engine C: Th = 1100 K, Tc = 500 K. Which two engines have the same thermal efficiency?
a. A and C b. B and C c. A and B d. No two have the same thermal efficiency. e. A and B and C