An ice skater glides across a frozen pond at a constant velocity. What is the net force acting on the skater?
A. more than her weight
B. equal to her weight
C. less than her weight but more than zero
D. depends on her speed
E. zero
E. zero
(constant velocity implies zero acceleration which implies zero net force [F = ma].
Also in the vertical direction the normal force (upward)
and her weight (downward) cancel each other.)
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When a photon is scattered from an electron, there will be an increase in the photon's
A) energy. B) frequency. C) wavelength. D) momentum. E) speed.
Force on a Wire: A straight wire that is 0.60 m and carrying a current of 2.0 A is placed at an angle with respect to the magnetic field of strength 0.30 T. If the wire experiences a force of magnitude 0.18 N, what angle does the wire make with respect to the magnetic field?
A. 20° B. 25° C. 30° D. 35° E. 60°
In contradiction to the teachings of Aristotle, Galileo found that an object with no forces (and no friction) acting on it will ____
a. move faster and faster b. eventually stop moving c. move at a constant speed forever d. first increase and then decrease in speed e. first decrease and then increase in speed
The objective of an astronomical telescope has a focal length of 900 mm. The telescope has eyepieces of focal lengths 20 mm, 15 mm, and 10 mm. What is the highest magnification for this telescope?
a. 
b. 
c. 
d. 
e. 