9 As shown in Fig. 4, a frictionless arc-shaped groove of mass m is placed on a frictionless horizontal surface. From the top of the groove a block of mass m slides down from at rest. The air drag neglected. The correct statement of the following is ( ) (A) The momentum of the system consisting of m and m is conserved. (B) The mechanical energy of the system consisting of m and m is conserved. (C) The mechanical energy of the system consisting of m, m and the Earth is conserved. (D) The normal force exerted on m by m always does no work. m Fig. 4
9 As shown in Fig. 4, a frictionless arc-shaped groove of mass m is placed on a frictionless horizontal surface. From the top of the groove a block of mass m slides down from at rest. The air drag neglected. The correct statement of the following is ( ) (A) The momentum of the system consisting of m and m is conserved. (B) The mechanical energy of the system consisting of m and m is conserved. (C) The mechanical energy of the system consisting of m, m and the Earth is conserved. (D) The normal force exerted on m by m always does no work. m Fig. 4
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Question
Transcribed Image Text:9 As shown in Fig. 4, a frictionless arc-shaped groove of
mass m is placed on a frictionless horizontal surface.
From the top of the groove a block of mass m slides down
from at rest. The air drag neglected. The correct statement
of the following is ( )
(A) The momentum of the system consisting of m and
m is conserved.
(B) The mechanical energy of the system consisting of
m and m is conserved.
(C) The mechanical energy of the system consisting of
m, m and the Earth is conserved.
(D) The normal force exerted on m by m always does no work.
m
Fig. 4
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