An elevator has mass 775 kg, not including passengers. The elevator is designed to ascend, at constant speed, a vertical distance of 20.0 m (five floors) in 18.0 s, and it is driven by a motor that can provide up to 49.0 hp to the elevator. What is the maximum number of passengers that can ride in the elevator? Assume that an average passenger has mass 70.0 kg. 1 hp = 746 W.

A 1.50 × 103-kg car starts from rest and accelerates uniformly to 16.9 m/s in 11.6 s. Assume that air resistance remains constant at 400 N during this time. (a) Find the average power developed by the engine. hp 29.7 (b) Find the instantaneous power output of the engine at t = 11.6 s, just before the car stops accelerating. 0.079670122 Your response differs significantly from the correct answer. Rework your solution from the beginning and check each step carefully. hp Need Help? Read It

24. A skier of mass 70 kg is pulled up a slope by a motor-driven cable. How many horsepower output must a motor have to pull him 100 m up a 30° frictionless slope at a constant speed of 2 m/s? a.700 b. 0.94 c. 746 d. 1.06 a b d

A car speeds at 18 m/s. The force of resistance remains constant at 400.0 N during this time. What is the average power developed by the car's engine?

Situation 02. A crate has a mass of 120kg and the coefficient of static and kinetic friction is 0.60 and 0.50, respectively. The crate starts from rest and the motor exerts a tension T= 1220 + 200t (N). If the elevation of the dock is 30 degrees from the horizontal, a. What is the velocity of the crate after 1sec? b. Compute the power transmitted after 1sec.

A box of mass 4.0 kg hangs by a cable from the ceiling of an elevator. The elevator is moving up at a steady speed of 5.0 m/s for 8.0 m. Use g = 10 m/s2. Consider the system is the box and the Earth. When apply the following energy principle, considering the system is box+earth, which of the energy term is positive? Select all apply. ΔK + ΔUg + ΔUsp + ΔEth + ΔEch = Wext Answer choice     ΔK     ΔUg      ΔUsp     ΔEth      ΔEch     Wext

In 2.79 minutes, a ski lift raises four skiers at constant speed to a height of 131 m. The average mass of each skier is 70.7 kg. What is the average power provided by the tension in the cable pulling the lift? Number Units