A 4.0-kg mass on the end of a string rotates in a circular motion on a horizontal frictionless table. The mass has a constant speed of 2.0 m/s and the radius of the circle is 0.80 m. What is the magnitude of the resultant force acting on the mass?
a. 39 N
b. 20 N
c. 44 N
d. 0 N
e. 30 N
b
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A 25-g string is stretched with a tension of 43 N between two fixed points 12 m apart. What is the frequency of the second harmonic?
A) 18 Hz B) 24 Hz C) 36 Hz D) 12 Hz E) 6.0 Hz
What component is combined with the converging lens to construct a light microscope?
a. A focusing tool for the lens. b. A second, diverging, lens. c. A second, converging, lens. d. A concave mirror. e. A convex mirror.
The angular speed of the hour hand of a clock, in rad/min, is
A.
.B.
.C.
.D.
E.
A spaceship approaches the Moon, traveling at 0.5c with respect to the Moon. Its crew shines a laser at the Moon. The beam strikes a lunar mirror and is reflected back to the ship. The crew on the ship will measure the speed of the reflected beam to be
A. 1.5c. B. 0.75c. C. 2.0c. D. c. E. 0.5c.