Physics, 13.01.2021 18:50 Corykids6080
Numerical:
1. A ball of mass 0.2kg falls from a height of 45m. on striking the ground it rebounds in 0.1 sec
with two third of the velocity with which it struck the ground. Calculate (i) the momentum
change on hitting the ground, (ii) the force on the ball due to the impact.
Answers: 3
Physics, 21.06.2019 19:00
Many machines- including inclined planes such as ramps- increase the strength of the force put into the machine but decrease the distance over which the force is applied.
Answers: 1
Physics, 21.06.2019 21:40
Avery hard rubber ball (m = 0.5 kg) is falling vertically at 4 m/s just before it bounces on the floor. the ball rebounds back at essentially the same speed. if the collision with the floor lasts 0.05 s, what is the average force exerted by the floor on the ball?
Answers: 3
Physics, 22.06.2019 07:50
The ratio of lift to drag l/d for a wing or airfoil is an important aerodynamic parameter, indeed, it is a direct measure of the aerodynamic efficiency of the wing. if a wing is pitched through a range of angle of attack, l/d first increases, then goes through a maximum, and then decreases. consider an infinite wing with an naca 2412 airfoil. estimate the maximum value of l/d. assume that the reynolds number is 9x10^6.
Answers: 2
Numerical:
1. A ball of mass 0.2kg falls from a height of 45m. on striking the ground it rebounds i...
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