A 75.0 kg skier slides down a 75.0 m high slope without friction. The velocity of the skier at the bottom of the slope is
A. 20.6 m/s.
B. 29.7 m/s.
C. 38.3 m/s.
D. 40.5 m/s.
E. 50.0 m/s.
C. 38.3 m/s.
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When we say an appliance "uses up electricity," we mean
A) current disappears. B) electric charges are dissipated. C) voltage is lowered. D) electric energy dissipates into heat.
A coil of 57. turns of wire has a diameter of 9.5 cm and carries 7.2 Amperes
(a) How large is the magnetic field, in Tesla, at the center of the loop? (b) How many Gauss is that? (c) If the same length of wire made a coil with twice the original diameter, how large is the magnetic field now?
A positive charge and a negative charge held near each other are released. As they move, the force on each particle
a. increases. b. Stays the same. c. decreases.
Which of the following properties make flare stars so active?
A) fast rotation rates B) deep convection zones C) convecting cores D) strong stellar winds E) both A and B