A car travels around an oval racetrack at constant speed. The car is accelerating
a.
at all points except B and D.
b.
at all points except A and C.
c.
at all points except A, B, C, and D.
d.
everywhere, including points A, B, C, and D.
e.
nowhere, because it is traveling at constant speed.
d
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Conservation of angular momentum means that a spinning body tends to:
A) fly apart. B) slow down. C) wobble into an eccentric orbit. D) gravitationally collapse. E) keep spinning.
Based on observations of the universal expansion, the age of the universe is about ________
A) 14,000 years B) 14 billion years C) 14 million years D) 14 trillion years
A 20-ton truck collides with a 1500-lb car. Which of the following statements must be true?
A) During the collision, the force on the truck is smaller than the force on the car. B) The car did not slow down during the collision, but the truck did. C) During the collision, the force on the truck is equal to the force on the car. D) The truck did not slow down during the collision, but the car did. E) During the collision, the force on the truck is greater then the force on the car.
A 100 lb sack of potatoes falls from an airplane. As the velocity of fall increases, the air resistance also increases. When air resistance equals 100 lb, the acceleration of the sack will be ____ m/sec/sec
a. 0 b. 16 c. 32 d. 9.8 e. 24