An object is moving with constant velocity. Which of the following statements is true?
A) A constant force is being applied in the direction of motion.
B) A constant force is being applied in the direction opposite of motion.
C) There are no forces acting on the object.
D) The net force on the object is zero.
E) There is no frictional force acting on the object.
D
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Energy Conservation With Nonconservative Forces: On a planet where g = 10.0 m/s2 and air resistance is negligible, a sled is at rest on a rough inclined hill rising at 30° as shown in the figure. The object is allowed to move and it stops on a rough horizontal surface, at a distance of 4.0 m from the bottom of the hill. The coefficient of kinetic friction on the hill is 0.40. What is the coefficient of kinetic friction between the horizontal surface and the sled?
A. 0.10 B. 0.20 C. 0.31 D. 0.40 E. 0.60
The concept the picture above is trying to get across is _______
a. intensity
b. luminosity
c. flux
d. energy
A boy and a girl are riding a merry-go-round which is turning at a constant rate. The boy is near the outer edge, while the girl is closer to the center. Who has the greater tangential acceleration?
A) the boy B) the girl C) Both have the same non-zero tangential acceleration. D) Both have zero tangential acceleration. E) There is not enough information given to answer the question.
An object consists of a rod (of length 3.00 m and negligible moment of inertia) to which four small 3.50-kg masses are attached, one at each end and one at each point on the rod spaced at 1.00-m intervals. The moment of inertia of this object about an axis perpendicular to the rod and through one of the end masses:
a. is 49 kg·m2. b. is 21 kg·m2. c. is 31.5 kg·m2. d. is 10.5 kg·m2. e. cannot be uniquely determined until it is stated which inner mass the axis goes through.