A mass vibrates back and forth from the free end of an ideal spring (k = 20. N/m) with an amplitude of 0.25 m. What is the maximum kinetic energy of this vibrating mass?
A) 2.5 J
B) 1.3 J
C) 0.63 J
D) 5.0 J
E) It is impossible to give an answer since kinetic energy cannot be determined without knowing the object's mass.
C
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A 200-? resistor, 40.0-mH inductor and a 2.00-?F capacitor are connected in series with a 120-V rms source at 1000 Hz. What is the phase angle of this circuit?
A) 49.3° B) 90.0° C) 40.7° D) 0° E) 45.0°
Which of the following statements best explains why the densities of Uranus and Neptune are higher than that of Saturn, even though Saturn is much more massive?
a They have higher masses. b. They have a higher proportion of hydrogen compounds and rock. c. They have stronger magnetic fields. d. They are at greater distances from the Sun. e. Their interiors are more compressed due to stronger gravity.
Two forces are the only forces acting on a 3.0-kg object which moves with an acceleration of 3.0 m/s2 in the positive y direction. If one of the forces acts in the positive x direction and has a magnitude of 8.0 N, what is the magnitude of the other force?
A. 12 N B. 14 N C. 16 N D. 18 N E. 22 N
A boy with a mass of 55 kg walks into a room and sees a girl 8.0 m in front of him who has a mass of 40 kg. What is his gravitational attraction to her?
A. 
B. 
C. 
D. 
E. 