NO LINKS! What are the definitions of initial horizontal velocity and initial vertical velocity? Please help! This like is my 20
1 answer:
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Answer:
J = 357.5 kg*m/s
Explanation:
- The impulse exerted on Katelyn when she was on the force plate, is equal to the change in her momentum, according to Newton's 2nd Law.
- Assuming as the positive direction the upward direction (coincident with the positive y-axis) we can express the initial momentum as follows:
- By the same token, the final momentum is as follows:
- As we have already said, the impulse J is just equal to the change in momentum, i.e., the difference between (2) and (1):
Answer:
D. 1.8 × 102 newtons radially inward
Explanation:
The magnitude of the centripetal force is given by:
where
m is the mass of the object
v is the tangential speed
r is the radius of the circular trajector
In this problem, we have m = 4.0 kg, v = 6.0 m/s and r = 0.80 m, therefore substituting into the equation we get
The centripetal force is the force that keeps the object in a circular trajectory, so it is a force that is always directed inward (towards the centre of the circular path) and radially. Therefore, the correct answer is
D. 1.8 × 102 newtons radially inward