8. An elevator can lift a load of 5000N from the ground level to a height of 20m in 10 seconds. Find the horsepower rating of the elevator.
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- 1. To compress spring 1 by 0.20m takes 150 J of work. Stretching spring 2 by 0.30m requires 210J of work. Which spring is stiffer? Explain and draws.10. Jared and Clay are climbing the stairs. Jared gets tired and stops halfway to the fourth floor. Clay makes it to the fourth floor v.. a problem. If Jared is twice as heavy as Clay, who has more potential energy? Explain.Power of the Human Heart. The human heart is a powerful and extremely reliable pump. Each day it takes in and discharges about 7500 L of blood. Assume that the work done by the heart is equal to the work required to lift this amount of blood a height equal to 1.5 m. The density (mass per unit volume) of blood is 1050 kg/m3 . What is the heart's power output. Use g = 9.8m/s2 Calculate answer to one decimal.
- A water pump draws water from a pit that is 11.5 m deep at a rate of 685 kg/min. The water ejects above the ground surface at a speed of 20.0m/s, making a vertical fountain. 1. Figure out what the power output is of the pump 2. How high is the fountain? Make sure to Ignore air resistance!4. Identify a case where an object is moving over a surface with friction, but the frictional force does no work.2. A 5.2-kg box slides a distance of 16.0-m. If the coefficient of kinetic friction is 0.30, what is the work done by the frictio" 6 d x244.64 J ✓cci 6 ccilo 16 cci16 ceiz
- 4. How much is the work done in pulling up a block of wood weighing 300 N for a length of 300 cm on a smooth plane inclined at an angle of 35° with the horizontal ? Answer = ENG DELL F10 F9 F8 F6 F7 F5 F2 F3 F4 $. 3. 3. 4. 10A 62 kg man climbs the CN tower which is 0.55 km high in 30 min. How powerful is the man? a) 1.9 X 10¹ W b) 1.9 X 10² W c) 1.1 X 10⁴ W d) 1.9 X 10⁻¹ W10. A rollercoaster cart begins at the bottom of a hill at rest. An external motor pulls a 1.2 x 10³ kg cart up to the top of the first hill. The power provided by the motor is 9.9 x10³ W and it takes the cart 35 s to reach the top of the first hill. The cart reaches the top of the first hill and is released with a speed of 7.0 m/s. There is no friction between the track and the cart. A: Pictorial Representation label givers with symbols Event 1: Motor turns on Event 2: Cart reaches the top of the first hill, motor turns off y₂-? Event 3: Cart reaches the top of the second hill. ya 10.0 88317 B: Physics Representation energy flow diagrams, energy bar charts E+E Flow 1-2 Flow 2-3 ÖFF OFF D: Mathematical Representation Complete equations, describe steps, algebraic work, substitutions, final answer (a) What is the total work done by the motor on the cart? (Hint: rearrange the power equation) (Tum over!) (b) What is the speed of the cart when it travels over the second hill? (If you could…