Question
A 1500kg car moving at a speed of 20 m/s comes to a halt. How much work was done by the brakes?
How fast can a 2.0 horsepower motor lift a 200 kg mass?
A boy with a mass of 20 kg is riding on a 10 kg cart which is travelling at 3 m/s. He jumps off in such a way that he lands on the ground with no horizontal speed. What was the change of speed of the cart?
not sure how to solve please help
How fast can a 2.0 horsepower motor lift a 200 kg mass?
A boy with a mass of 20 kg is riding on a 10 kg cart which is travelling at 3 m/s. He jumps off in such a way that he lands on the ground with no horizontal speed. What was the change of speed of the cart?
not sure how to solve please help
Answers
Henry
1. Work = 0.5M*V^2 = 0.5*1500*20^2 =
300,000 J.
2. hp * 746W/hp = 1492 Watts=1492J/s.
P = F*V = Mg * V = 1492 J/s.
200*9.8 * V = 1492
1960V = 1492
V = 0.76 m/s.
300,000 J.
2. hp * 746W/hp = 1492 Watts=1492J/s.
P = F*V = Mg * V = 1492 J/s.
200*9.8 * V = 1492
1960V = 1492
V = 0.76 m/s.
G
thank you for the help
Henry
Glad I could help.