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　　21.A cart is pulled by a rope making an angle of 45 to the horizontal.If 100 newtons of force are applied to the rope,the magnitude of the horizontal component force is approximately

　　A.45N B.141N C.100N D.80N E.71N

　　E

　　22.A moon of mass m orbits a plant of mass 100m. Let the strength of the gravitational force exerted by the planet on the moon be denoted by F,and let the strength of the gravitational force exerted by the moon on the planet be F.Which of the following is true?

　　A. F=100 F B.10 F= F C. F= F. D. F.=10 F E. F.=100F23.At the surface of the earth , an object of mass m has weight w . If this object is transported to an altitude that’s twice the radius of the earth , then , at the new location

　　A. its mass is m/2 and its weight is w/2 B. its mass is m and its weight is w/2

　　C.its mass is m/2 and its weight is w/4 D. .its mass is m and its weight is w/4

　　E. .its mass is m and its weight is w/9

　　E

　　24.If the distance between two point particles is doubled, then the gravitational force between them

　　A.decreases by a factor of 4 B. decreases by a factor of 2

　　C. increases by a factor of 2 D. increases by a factor of 4

　　E.Cannot be determined without knowing the masses

　　25. The resultant of a 3-newton and a 4-newton force acting simultaneously on an object at right angles to each other is,in newtons

　　A.0 B.1 C.3.5 D.5 E.7

　　D

　　26.Two force act together on an object.The magnitude of their resultant is least when the angle between the forces is

　　A.0 B.45 C.60 D.90 E.180

　　E

　　27.The resultant of a 5-newton and a 12-newton force acting simultaneously on an object in the same direction is,in newtons.

　　A.0 B.5 C.7 D.13 E.17

　　E

　　28. An object is moving around a circle of radius 1.5 meters at a constant velocity of 7 meters per second. The frequency of the motion, in revolution per second, is

　　A.0.24 B.0.53 C.0.67 D.0.74 E.0.98

　　D

　　29.An object undergoes uniform accelerated motion. If the radius of the path is 2 meters and the period is equal to 4 seconds, the magnitude of the centyipetal acceleration is equal to

　　A.5m/s B.10 m/s C.20 m/s D.25 m/s E.30 m/sA

　　30.An object undergoes uniform accelerated motion. If the radius of the path is equal to 1.5 meters and the magnitude of the centripetal acceleration is equal to 6 m/s,the magnitude of the tangential velocity is equal to

　　A.3m/s B.4 m/s C.5 m/s D.6 m/s E.9 m/s

　　A

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