A car is going around a racetrack at constant speed. The curves around the track have different radii. In which turn is the magnitude of the car's acceleration the greatest?
a. It is the greatest in the turn with the greatest radius.
b. It is the greatest in the turn with the smallest radius.
c. The acceleration is zero everywhere because of the constant speed. d. More information is needed to determine the answer.
B
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Conservation of Momentum: A small car meshes with a large truck in a head-on collision. Which of the following statements concerning the momentum during the collision are correct? (There could be more than one correct choice.)
A. The momentum of the truck is conserved. B. The momentum of the car is conserved. C. The car and the truck must undergo the same change in speed. D. The momentum of the car and the momentum of the truck are each conserved. E. The momentum of the car-truck system is conserved, but the momentum of each one separately is not conserved.
What is the shortest wavelength in the Balmer series?
A) 328 nm B) 365 nm C) 456 nm D) 656 nm E) 820 nm
A ray in air is incident on a glass plate whose index of refraction is 1.42. The angle of refraction is one half the angle of reflection. The angle of refraction is closest to:
A) 45° B) 43° C) 41° D) 39° E) 37°
We say we are looking back in time when we are looking at the stars because
A) we see stars as they once were when their light reaches us. B) space curves, we are actually looking at the past when we look in the night sky. C) stars are emitting immense radiation, we are seeing processes that have already happened. D) Earth's atmosphere bends and distorts their light.