Please Answer Questions 1-3

1. How long will it take for a 1750 W motor to lift a 335 kg piano to a 6^th story window 16 m above?(30s)

2. If a car generates 18hp when traveling at a steady 95km/hr what must be the average force exerted on the car due to friction and air resistance? 510N

3. During a workout, football players ran up stadium stairs in 75s. The stairs are 78m long and inclined at an angle of 33 degrees. If a player has a mass of 92 kg, estimate his average power output on the way up. Ignore friction. 510W