The only force acting on a 1.6-kg body as it moves along the x axis is given in the figure. If the velocity of the body at x = 2.0 m is 5.0 m/s, what is its kinetic energy at x = 5.0 m?
A. 52 J
B. 44 J
C. 36 J
D. 60 J
E. 25 J
Answer: C
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An object is thrown downward with an initial (t = 0) speed of 10 m/s from a height of 60 m above the ground. At the same instant (t = 0), a second object is propelled vertically upward from ground level with a speed of 40 m/s. At what height above the ground will the two objects pass each other?
A. 53 m B. 41 m C. 57 m D. 46 m E. 37 m
The wavelength of light visible to the human eye is on the order of 5 × 10?7 m. If the speed of light in air is 3 × 108 m/s, find the frequency of the lightwave.
A. 3 × 107 Hz B. 4 × 109 Hz C. 5 × 1011 Hz D. 6 × 1014 Hz E. 4 × 1015 Hz
Which statement is NOT true?
a. A transformer contains a primary coil of wire and a secondary coil of wire wound around the same iron core. b. A transformer changes one voltage to another. c. A transformer works because changing magnetic fields can induce electric fields. d. A transformer operates on direct current as well as on alternating current. e. Transformers are commonly used for delivering household electric power.
Two long parallel wires separated by 5.0 mm each carry a current of 60 A. These two currents are oppositely directed. What is the magnitude of the magnetic field at a point that is between the two wires and 2.0 mm from one of the two wires?
A. 2.0 mT B. 10 mT C. 8.0 mT D. 1.6 mT E. 7.2 mT