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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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 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
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.
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