A tennis player swings her 1000 g racket with a speed of 10 m/s. She hits a 60 g tennis ball that was approaching her at a speed of 20 m/s. The ball rebounds at 40 m/s.
a. How fast is her racket moving immediately after the impact? You can ignore the interaction of the racket with her hand for the brief duration of the collision.
b. If the tennis ball and racket are in contact for 10 ms, what is the average force that the racket exerts on the ball? How does this compare to the gravitational force on the ball?
a) Speed of the racket is 6.4 m/s
b) Average force that the racket exerts is 360 N and where is the gravitational force.
We need to find out :
a) Speed of the racket moving immediately after the impact.
b) Average force that the racket exerts on the ball and its relation with Gravitational force.
The collision occurring as an elastic collision.
Using Law of Conservation of Momentum,
Impulse can be expressed as :
F can be compared with FG as:
The stoplight had just changed and a 2000 kg Cadillac had entered the intersection, heading north at 3.0 m/s, when it was struck by a 1000 kg eastbound Volkswagen. The cars stuck together and slid to a halt, leaving skid marks angled 35° north of east. How fast was Volkswagen going just before the impact?
The nucleus of the polonium isotope (mass 214 u) is radioactive and decays by emitting an alpha particle (a helium nucleus with mass 4 u). Laboratory experiments measure the speed of the alpha particle to be . Assuming the polonium nucleus was initially at rest, what is the recoil speed of the nucleus that remains after the decay?
94% of StudySmarter users get better grades.Sign up for free