One half second after starting from rest, a freely falling object will have a speed of about
A) 2 m/s.
B) 5 m/s.
C) 10 m/s.
D) 20 m/s.
E) none of the above
Answer: B
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A rectangular steel plate with dimensions of 40.0 cm × 30.0 cm is heated from 14.0°C to 164.0°C. What is its change in area? (Coefficient of linear expansion for steel is 11 × 10^?6/C°.)
a. 8.96 cm2 b. 29.7 cm2 c. 3.96 cm2 d. 1.32 cm2 e. 9.90 cm2
When measuring the Hall voltage, what happens to the reading when the current is increased 20%?
A. it increases 20% B. it increases 40% C. it increases 44% D. it decreases 20% E. it decreases 44%
Force on a Moving Charge: An electron, moving south, enters a magnetic field. Because of this field, the electron curves upward. We may conclude that the magnetic field must have a component
A. downward. B. towards the east. C. upward. D. towards the west. E. towards the north.
Which of the following type(s) of materials is(are) repelled when a magnet is brought near by?
a. paramagnetic b. diamagnetic c. ferromagnetic d. paramagnetic and ferromagnetic e. paramagnetic, ferromagnetic, and diamagnetic