A 2.00 kg-ball has zero kinetic and potential energy. Ernie drops the ball into a 10.0-m deep well. Just before the ball hits the bottom, the sum of its kinetic and potential energy is:
a. zero.
c. -196 J.
b. 196 J.
d. 392 J.
A
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The acceleration due to gravity is 10 m/sec2. If an object falls from rest, its instantaneous speed at the end of the fifth second is (neglecting air resistance)
A) 10 m/sec. B) 5 m/sec. C) 100 m/sec. D) 50 m/sec. E) impossible to determine from the given information.
The x and y components of a vector in a horizontal plane are 4.00 m and 3.00 m, respectively
(a) What is the magnitude of this vector? (b) What angle does this vector make with the positive +y-axis.
Upon entering a medium in which the speed of light is 1.5 × 10^8 m/s from a medium in which the speed of light is 2 × 10^8 m/s, an oblique light ray will be _____________ the normal to the interface between the two media
a. bent away from b. bent toward c. travel along d. remain undeviated with respect to
An astronomical telescope is made with lenses of focal lengths 80.0 and 1.25 cm. What magnifying power does this telescope provide?
A. 10 B. 81 C. 79 D. 64 E. 41