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An elevator has mass 680kg , not including passengers. The elevator is designed to ascend, at constant speed, a vertical distance of 21.0m (five floors) in 15.8s , and it is driven by a motor that can provide up to 35hp to the elevator. What is the maximum number of passengers that can ride in the elevator? Assume that an average passenger has mass 65.0 kg . Express you answer as an integer.
A tennis player, when performing a serve, applies an average force to a tennis ball of 525 N to a 55 g ball. What is the speed of the ball as it leaves the racket
A certain airplane has a speed of 250.0 km/h and is diving at an angle of 30.0° below the horizontal when the pilot releases a radar decoy. The horizontal distance between the release point and the point where the decoy strikes the ground is 700 m..
What is the electric potential energy of a system that consists of two protons 2.0×10?15 apart-as might occur inside a typical nucleus?
A bob of mass = 0.300 is suspended from a fixed point with a massless string of length = 25.0. What tangential speed must the bob have so that it moves in a horizontal circle with the string making an angle 21.0 with the vertical
A helicopter flies at a constant altitude towing a mass M of 119 kg. The helicopter and the mass have a horizontal acceleration of 2.54 m/s^2. Ignore air resistance find the tension in the cable.
How much lift is exerted on the wings of an airplane that have atotal surface area of 102 m2 when the difference in air pressure below and above the wings is 4% of atmospheric pressure?
A child in a boat throws a 5.45-kg package out horizontally with a speed of 10.0 m/s. Calculate the velocity of the boat immediately after, assuming it was initially at rest
In a physics laboratory experiment, a coil with 210 turns enclosing an area of 13cm^2 is rotated from a position, What is the average emf induced in the coil
A car with a mass of 1.50x10^3 kg starts from rest and accelerates to a speed of 18.0 m/s in 12s. Assume that the force of resistance remains constant at 400-N all through this time. What is the average power developed by the car's engine?
An automobile with 0.200 m radius tires travels 70,000 km before wearing them out. How many revolutions do the tires make
A 0.100 kg meterstick is supported at its 40 cm mark by a string attached to the ceiling. A 0.700 kg mass hangs vertically from the 5 cm mark.
A cyclist, traveling at a constant speed, covers a distance of 6860 m in a time period of 34.5 minutes. Calculate the power the cyclist must provide in overcoming that force
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