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A car is to be hoisted by elevator to the fourth floor of a parking garage, which is 14 m above the ground. If the elevator can have a maximum acceleration of 0.2 m/s^(2) and maximum decelaration of 0.1m/s^(2) and can rach a maximum speed of 2.5 m/s, determine the shortest time to make the lift, starting from rest and ending at rest.

A car is to be hoisted by elevator to the fourth floor of a parking garage, which is 14 m above the ground. If the elevator can have a maximum acceleration of 0.2 m/s^(2) and maximum decelaration of 0.1m/s^(2) and can rach a maximum speed of 2.5 m/s, determine the shortest time to make the lift, starting from rest and ending at rest.

Grade:11

2 Answers

easwer
40 Points
7 years ago
A ball having a mass 1.5 kg is thrown vertically upward from ground with a velocity 20 m/s. It returns to the ground with a speed 18 m/sec. If g = 9.8 m/s2, the work done by air resistance is

 

easwer
40 Points
7 years ago
A wind powered generator converts wind energy into electric energy. Assume that the generator converts a fixed fraction of the wind energy intercepted by its blades into electrical energy. For wind speed v, the electric power out put will be proportional to

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