Part AA 57 kg woman athlete can generate a sustainedspecific power output of 5.0 W/kg. One trainingexercise is to push a heavy sled across the grass ata steady speed, which takes a horizontal pushingforce of 155 N.What speed can she maintain for a sustained period of time?Express your answer with the appropriate units.µÁValueUnitsU =SubmitRequest AnswerPart BHow much stored chemical energy will she "burn" in 10 minutes if her body is 25% efficient at converting chemical energyinto mechanical energy?Express your answer with the appropriate units.HÅE =ValueUnits%3DSubmitRequest Answer •Part CCalories are more familiar units than joules for thinking about the body's energy use. A useful conversion factor is1 Cal = 4.2 kJ, where Cal įs the abbreviation for a food calorie. How many calories does the woman burn during the10 min workout?%3DExpress your answer in calories.ΑΣφ?Cal%3DSubmitRequest Answer

In this question we are given with a situation about a female athlete and we have to answer some…

A 57 kg woman athlete can generate a sustained specific power output of 5.0 W/kg. One training exercise is to push a heavy sled across the grass at a steady speed, which takes a horizontal pushing force of 155 N.

A 57 kg woman athlete can generate a sustained specific power output of 5.0 W/kg. One training exercise is to push a heavy sled across the grass at a steady speed, which takes a horizontal pushing force of 155 N.

Physics for Scientists and Engineers, Technology Update (No access codes included)

9th Edition

ISBN:9781305116399

Author:Raymond A. Serway, John W. Jewett

Publisher:Raymond A. Serway, John W. Jewett

Chapter7: Energy Of A System

Section: Chapter Questions

Problem 7.15OQ: A cart is set rolling across a level table, al the same speed on every trial. If it runs into a...

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A cart is set rolling across a level table, at the same speed on every trial. If it runs into a patch of sand, the cart exerts on the sand an average horizontal force of 6 N and travels a distance of 6 cm through the sand as it comes to a stop. It instead the cart runs into a patch of gravel on which the can exerts an average horizontal force of 9 N, how far into the gravel will the cart roll before stopping? (a) 9 cm (b) 6 cm (c) 4 cm (d) 3 cm (e) none of those answers
The masses of the javelin, discus, and shot are 0.80 kg, 2.0 kg, and 7.2 kg, respectively, and record throws in the corresponding track events are about 98 m, 74 m, and 23 m, respectively. Neglecting air resistance, (a) calculate the minimum initial kinetic energies that would produce these throws, and (b) estimate the average force exerted on each object during the throw, assuming the force acts over a distance of 2.0 m. (c) Do your results suggest that air resistance is an important factor?
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a. Saif is going in his bike with an initial speed of 24.2 m/s and as he approaches a crane, the braking system abruptly brings the 223kg bike (rider mass included) to a speed of 4.3 m/s over a distance of 6.7m. Determine the braking force applied to his bike. b. A tow truck is experiencing 600 N tensional force in the cable and the cable makes a 60o angle with the horizontal, If the mass of the car is 2400 kg, calculate the acceleration with which it gets lifted? c. A Physics 1 student got confused by Newton’s laws and asks her teacher this question “Astronauts in outer orbit are weightless (or float) because there is no gravity there”. Is this true? If not, explain the mistake in this statement.
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A 0.01kg bullet is shot upward (+y axis) at 3600kph and hits and passes through the center of mass of a 5kg stationary block. The bullet emerges from the block and continues to move upward at 1440kph. To what maximum height does the block then rise above from its original position? (Answer in 3 decimal places, no unit)
(a) Calculate the force needed to bring a 950-kg car to rest from a speed of 90.0 km/h in a distance of 120 m (a fairly typical distance for a non-panic stop). (b) Suppose instead the car hits a concrete abutment at full speed and is brought to a stop in 2.00 m. Calculate the force exerted on the car and compare it with the force found in part (a).
A child of mass m starts from rest and slides without friction from a height h along a curved waterslide (Fig. P5.46). She is launched from a height h/5 into the pool. (a) Is mechanical energy conserved? Why? (b) Give the gravitational potential energy associated with the child and her kinetic energy in terms of mgh at the following positions: the top of the waterslide, the launching point, and the point where she lands in the pool. (c) Determine her initial speed V0 at the launch point in terms of g and h. (d) Determine her maximum airborne height ymax in terms of h, g, and the horizontal speed at that height, v0x. (e) Use the x-component of the answer to part (c) to eliminate from the answer to part (d), giving the height ymax in terms of g, h, and the launch angle . (f) Would your answers be the same if the waterslide were not frictionless? Explain. Figure P5.46
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A person slaps her leg with her hand, bringing her hand to rest in 2.50 milliseconds from an initial speed of 4.00 m/s. (a) What is the average force exerted on the leg, taking the effective mass of the hand and forearm to be 1.50 kg? (b) Would the force be any different if the woman clapped her hands together at the same speed and brought them to rest in the same time? Explain why or why not.