用中文解答第二题,第三题,第四题第五题和第六题
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2. Which one of the following is equal to 1 Newton?
A)
B)
C)
D)
3.A 20 kg box moving at an initial speed of slides 25 m to the right on a horizontal floor before it comes to a complete stop, what is the coefficient of friction between the box and the floor?
(A) 0.1
(B) 0.2
(C) 0.4
(D) 0.6
(E) 0.8
4.A 50.0 N box is at rest on a horizontal surface. The coefficient of static friction between the box and the surface is 0.50 , and the coefficient of kinetic friction is 0.30 . A horizontal 20.0 N force is then exerted on the box. The magnitude of the acceleration of the box is most nearly
(A)
(B)
(C)
(D)
5.Two people, one of mass 100 kg and the other of mass 50 kg , stand facing each other on an ice-covered pond. if the heavier person pushes on the lighter one with a force F , then
(A)The force felt by the heavier person is -0.5 F
(C)The magnitude of the acceleration of the lighter person will be 0.5 of the magnitude of the acceleration of the heavier person
(D)The magnitude of the acceleration of the lighter person will be twice the magnitude of the acceleration of the heavier person
6.Three forces act on an object. If the object is in translational equilibrium, which of the following must be true?
I. The vector sum of the three forces must equal zero.
II. The magnitudes of the three forces must be equal
III. All three forces must be parallel
(A) I only
(B)II only
(C)I and III
(D)II and III
斯课堂国际数同 Thinktown Education I New York - Beling - Shanghai - Shenzhen - Hangzhou
28
第三题
第四题
第五题
第六题
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