Physics Quizzes Questions & Answers

Physics Quizzes Questions & Answers A ball is thrown vertically upward from the surface of the earth. Consider the following quantities (1) the speed of the ball (2) the velocity of the ball (3) the acceleration of the ball A. 1 and 3 B. 1 and 3 C. 1 only D. 2 only E. 1, 2, and 3 - CORRECT ANSWER- A A ball is whirled on the end of a string in a horizontal circle of radius R at a constant speed v. The centripetal acceleration of the ball can be increased by a factor of 4 by A. Keeping the speed fixed and increasing the radius by a factor of 4 B. Keeping the radius fixed and increasing the speed by a factor of 4 C. Keeping the radius and increasing the period by a factor of 4 D. Keeping the radius fixed and decreasing the period by a factor of 4 E. Keeping the speed fixed and decreasing the radius by a factor of 4 - CORRECT ANSWERE A baseball is hit upward and travels along a parabolic arc before it strikes the ground. Which one of the following statements is necessarily true? A. the acceleration of the ball decreases as the ball moves upwards