A 3.0-kg object moves to the right at 4.0 m/s. It collides head-on with a 6.0-kg object moving to the left at 2.0 m/s. Which statement is correct?
A) The total momentum both before and after the collision is 24 kg ? m/s.
B) The total momentum before the collision is 24 kg ? m/s, and after the collision is 0 kg ? m/s.
C) The total momentum before the collision is 0 kg ? m/s, and after the collision is 24 kg ? m/s.
D) The total momentum both before and after the collision is zero.
E) None of the above is true.
D
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A sled having a certain initial speed on a horizontal surface comes to rest after traveling 10 m. If the coefficient of kinetic friction between the object and the surface is 0.20, what was the initial speed of the object?
A) 9.8 m/s B) 6.3 m/s C) 3.6 m/s D) 7.2 m/s E) 8.9 m/s
Ariel claims that a pulse is described by the equation 
where x and y are measured in cm and t in s. Miranda says that it is not possible to represent a pulse with this function because a wave must be a function of x + vt or x?vt. Which one, if either, is correct, and why?
A.
B.
C.
D.
E.
is infinite when x = 0.A 10-A current flows through a wire for 2.0 min. (e = 1.60 × 10-19 C) (a) How much charge has passed through this wire? (b) How many electrons have passed any point in the wire?
What will be an ideal response?
The jovian planets in our solar system are
A) Mercury, Venus, Earth, and Mars. B) Jupiter, Saturn, Uranus, Neptune, Pluto, and Eris. C) Jupiter, Saturn, Uranus, and Neptune. D) Io, Europa, Ganymede, and Callisto.