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举一反三
【单选题】2-1 As shown in the figure, an object with mass m tied by a thin thread, which is parallel to an inclined plane, si placed on a smooth inclined plane. If the inclined plane moves toward to left with a...
A.
g sin θ
B.
g cos θ
C.
gtan θ
D.
g cot θ
【简答题】3-2Translation: Newton’s second law implies that: When a body is acted upon by a constant force, its resulting acceleration is inversely proportional to the mass of the body and is directly proportion...
【单选题】An artificial Earth satellite in an elliptical orbit has its greatest centripetal acceleration when it is at what location?
A.
nearest the Earth
B.
farthest from the Earth
C.
between Earth and Moon
D.
between Earth and Sun
E.
none of the others
【单选题】The magnitude of the normal acceleration is
A.
proportional to radius of curvature.
B.
inversely proportional to radius of curvature.
C.
sometimes negative.
D.
zero when velocity is constant.
【单选题】Starting at time t = 0, an object moves along a straight line. Its coordinate in meters is given by x ( t ) = 75 t – 1.0 t 3 , where t is in seconds. When it momentarily stops its acceleration is:
A.
0
B.
–73 m/s 2
C.
–30 m/s 2
D.
–9.8 m/s 2
E.
9.2 ´ 10 3 m/s 2
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