6. A man having a mass of 60 kg. runs up a flight of stairs with a vertical height of 5 meters. If the trip takes 8 seconds to complete, calculate the man's power.
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- 4. Calculate the power made by a 50-kg boy running up the stairs with a height of 3.00 m in 2.50 s.26. A 2000 kg car with speed 12.0 m/s hits a tree. The tree does not move or break and the front of the car is smashed inward 50.0 cm. Ignore friction. (a) Determine the work done on the car by the tree. (b) Determine the amount of force involved.4. You throw a 20-N rock vertically into the air from ground level. You observe that when it is 15.0 m above the ground, it is traveling at 25.0 m/s upward. Use the work-energy theorem to find (a) The rock's speed just as it left the ground and (b) Its maximum height.
- Answer both or NONE question 1 - For exercise, an athlete lifts a barbell that weighs 400 N from the ground to a height of 2.20 m at a constant speed in a time of 1.60 s. What is the metabolic power, in kW (kiloWatts)? Your answer needs to have 2 significant figure, including the negative sign in your answer if needed. Do not include the positive sign if the answer is positive. No unit is needed in your answer, it is already given in the question statement. Question 2 - The metabolic power for typing is 150 W for Lili, not a lot as you know probably. How long does it take to burn off the energy in a slice of apple pie, which energy content is 1680 kJ (400 food calorie), in minutes? (Try to stay active, working/studying in front of a computer is not the best exercise you can do for your body.)An advertisement claims that a(n) 1600 kg car can accelerate from rest to 26 m/s in 8.4 s. Given: Unit conversion: 746 W/hp. What average power must the motor pro- duce to cause this acceleration, if we ignore friction and air resistance? Answer in units of hp. Answer in units of hp. Your response... PALETTE3. Suppose you lift a 20 kg box by a height of 1.0 m. a) How much work do you do in lifting the box? Instead of lifting the box straight up, now suppose you push it up a 1.0m high ramp that makes a 30-degree angle with the horizontal. The ramp has no friction. b) How much force F is required to push the box straight up the ramp at constant speed? c) How long is the ramp? d) Use your force and distance results to calculate the work you do in pushing the box up the ramp. How does your answer compare to what you got in part a?