Acceleration is sometimes expressed in multiples of g, where is the acceleration of an object due to the earth's gravity. In a car crash, the car's forward velocity may go from to in How many g's are experienced, on average, by the driver?
A) 20 g
B) 14 g
C) 24 g
D) 26 g
A
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Into the gap between the plates of a parallel plate capacitor of capacitance 
a slab of metal is inserted halfway between the plates filling one fourth of the gap between the plates. What is the resulting new capacitance?
A.
B.
C.
D.
E.
A 50-kg box is resting on a horizontal floor. A force of 250 N directed at an angle of 30.0° below the horizontal is applied to the box. The coefficient of static friction between the box and the surface is 0
40, and the coefficient of kinetic friction is 0.30. What is the force of friction on the box? A) 32 N B) 200 N C) 220 N D) 250 N E) 620 N
Synchrotron radiation is produced by
a. objects with temperature below 10,000 K. b. high-velocity electrons moving through a magnetic field. c. cold hydrogen atoms in space. d. the collapsing cores of massive stars. e. helium flash.
What is the approximate temperature of the universe (as a whole) today?
A) 3K B) 3000K C) 300K D) The universe cannot be said to have a single temperature.