During the collision between the ball and the racket, the velocity vector of the tennis ball is exactly reversed such that its speed is the same before and after the collision. Determine the speed of the ball assuming its mass to be 150 g. A nucleus A of mass 2 m moving with velocity 100 m/s collides inelastically with a stationary nucleus B of mass 10 m. After collision, the nucleus A travels at 90o to the original incident direction while B proceeds at an angle 37o to the original incident direction. a) Find the speeds of A and B after the collision. b) What fraction of the initial kinetic energy is gained or lost due to the collision? Two blocks having equal masses m1 = m2 = 10 kg are placed in contact on a surface inclined at an angle of 40o from the horizontal as shown in the figure below. The coefficient of static friction between the incline and the lower block is µs1 = 0.90 and the coefficient of kinetic friction is µk1 = 0.40. The respective coefficients between the incline and the upper block are µs2 = 0.60 and µk2 = 0.30. a) Draw a freebody diagram for the system consisting of the contacting blocks. b) Assuming the blocks were initially at rest on the incline, determine whether or not they will begin to slide. If they do slide, what is the acceleration? c) Determine the magnitude of the contact force exerted on the lower block by the upper block.
During the collision between the ball and the racket, the velocity vector of the
tennis ball is exactly reversed such that its speed is the same before and after the
collision. Determine the speed of the ball assuming its mass to be 150 g.
A nucleus A of mass 2 m moving with velocity 100 m/s collides
inelastically with a stationary nucleus B of mass 10 m. After collision, the nucleus A
travels at 90o
to the original incident direction while B proceeds at an angle 37o
to the
original incident direction.
a) Find the speeds of A and B after the collision.
b) What fraction of the initial kinetic energy is gained or lost due to the collision?
Two blocks having equal masses m1 = m2 = 10 kg are placed in contact on
a surface inclined at an angle of 40o
from the horizontal as shown in the figure below.
The coefficient of static friction between the incline and the lower block is µs1 = 0.90 and
the coefficient of kinetic friction is µk1 = 0.40. The respective coefficients between the
incline and the upper block are µs2 = 0.60 and µk2 = 0.30.
a) Draw a freebody diagram for the system consisting of the contacting blocks.
b) Assuming the blocks were initially at rest on the incline, determine whether or not
they will begin to slide. If they do slide, what is the acceleration?
c) Determine the magnitude of the contact force exerted on the lower block by the upper
block.
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