The focal length of the lens of a simple camera is 40.0 mm. How far must the lens be moved to change the focus of the camera from a person 25 m away to one that is 4.0 m away?
A) 0.2 mm
B) 0.3 mm
C) 0.4 mm
D) 0.5 mm
E) 0.7 mm
B
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Jets from compact objects are explained by the effect of _____
a. magnetic fields b. gravitational waves c. angular momentum d. mass transfer e. pulsar winds
What is kinetic energy?
a. The energy stored in a dry cell. b. The energy an object has because of its position. c. The energy an object such as a spring has because of its shape. d. The energy an object has because of its motion. e. The energy that two objects at rest have because of their gravitational attraction.
A particle is in the ground state of a one-dimensional box of length 1.0 m. What is the minimum value of its momentum (in kg × m/s)?
a. 9.9 × 10^-34 b. 6.6 × 10^-34 c. 3.3 × 10^-34 d. 13 × 10^-34 e. cannot be solved unless mass of particle is known.
From Kepler's ________ law, we conclude that the planets do not move with constant speed.
A. First B. Second C. Third D. Fourth