A heater is rated to dissipate 2880 W when connected to a 120 V source. The current drawn by the device is
A. 0.133 A.
B. 240 A.
C. 60 A.
D. 24 A.
E. 30 A.
Answer: D
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Suppose you climb the stairs of an eight-story building, about 24 m high, and your mass is 70 kg. The gravitational potential energy you gain is about
A. 40 calories. B. 16,500 calories. C. 40 Joule. D. 16,500 Joule.
The radius of a sphere is 2.00 m. The surface area of the sphere is
A. 36.7 
B. 50.3
C. 72.5
D. 75.0
A tiny particle with charge + 5.0 ?C is initially moving at 55 m/s. It is then accelerated through a potential difference of 500 V. How much kinetic energy does this particle gain during the period of acceleration?
A) 1.0 × 104 J B) 2.5 × 10-3 J C) 100 J D) 2500 J
A radioactive isotope with an atomic number of 90 undergoes beta decay. What is the atomic number of the daughter nucleus?
A) 89 B) 91 C) 92 D) 88