Compute the difference in height attained by ball in two cases Case(i) : ball is thrown with 20 m/s vertically upwards Case(ii) : Ball is thrown with 15 m/s vertically upwards

4. An airplane initially at rest accelerates at 4.5 m/s² down a runway. It reaches a velocity of 33 m/s before it lifts off the ground. a. How much time does the airplane spend on the runway before taking off? gintarit no1 Inemsonigy insod mot avhh limm om bas boos qia o rot ylipalay agstovsods bas busbe ogsnove ori bait b. Find the distance the airplane travels before it lifts off.

A wind turbine is designed to produce the power of 5 kW. What is the percentage of mechanical and electrical conversion if the value of C, is 0.45, Wind speed is 5 m/s length of the blade is 15 m density of air is 1.12 kg/m?.

A boxer delivers a hard blow to the chin of his opponent. The inertia of the boxer's hand (with glove) and forearm is 3.0 kg, and the inertia of the opponent's head is 6.5 kg. You learned in neurobiology class about 10 J of extra internal energy will render an opponent wobbly - kneed, and you guess that about half of the converted energy will end up in the opponent's head. Assuming a coefficient of restitution e = 0.20, with what speed does the boxer's fist have to contact the opponent's head in order to deliver the punch?