The force responsible for a car moving steadily along a no-friction icy banked curve is due to
A) centrifugal effects.
B) the normal force at right angles to the curved surface.
C) the radial component of the normal force.
D) none of the above
Answer: C
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Fill in the blank in the following chemical reaction that occurs in theSun: Deuterium+proton = ?? + energy:
a) hydrogen-1 b) helium-3 c) deuterium-2 d) carbon-12 e) helium-4
A megaton explosion releases
How much mass is converted into energy in this process?
A. none, if it a result of a chemical reaction
B. none, since mass is conserved
C. 50 kg
D. 50 g
E. 
Graphical Analysis: The graph in the figure shows the velocity of a particle as it travels along the x-axis. (a) In what direction (+x or -x) is the acceleration at t = 0.5 s?(b) In what direction (+x or -x) is the acceleration at t = 3.0 s?(c) What is the average acceleration of the particle between t = 2.0 s and t = 4.0 s?(d) At what value of t is the instantaneous acceleration equal to 0 m/s2?
What will be an ideal response?
The first of two identical boxes of mass m is sitting on level ground. The second box is sitting on a ramp that makes a 20° angle with the ground. The normal force of the level ground on the first box is 
; the normal force of the ramp on the second box is 
. Which statement is correct?
A.
= = mg.B.
= mg; = mg sin 20°.C.
= mg; = mg cos 20°.D.
= mg; = ?mg cos 20°.E.
= ? = ?mg.