A 53.4-kg skateboarder starts out with a speed of 1.76 m/s. He does 80.8 J of work on himself by pushing with his feet against the ground. In addition, friction does -208 J of work on him. In both cases, the forces doing the work are non-conservative. The final speed of the skateboarder is 7.88 m/s. (a) Calculate the change (PEf - PE) in the gravitational potential energy (h) How much has the vertical height of the skater changed? Give the absolute value

A 53.4-kg skateboarder starts out with a speed of 1.76 m/s. He does 80.8 J of work on himself by pushing with his feet against the ground. In addition, friction does -208 J of work on him. In both cases, the forces doing the work are non-conservative. The final speed of the skateboarder is 7.88 m/s. (a) Calculate the change (PEf - PE) in the gravitational potential energy (h) How much has the vertical height of the skater changed? Give the absolute value

Name: A 53.4-kg skateboarder starts out with a speed of 1.76 m/s. He does 8
Uploaded: 2024-03-20T06:57:25.000Z
Channel: Bartleby
Description: A 53.4-kg skateboarder starts out with a speed of 1.76 m/s. He does 80.8 J of work onhimself by pushing with his feet against the ground. In addition, friction does -208 J of workon him. In both cases, the forces doing the work are non-conservative.

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

See similar textbooks

Similar questions

(a) What is the efficiency of an out-of-condition professor who does 2.30 ✕ 105 J of useful work while metabolizing 490 kcal of food energy? (Enter your answer as a percentage. Enter a number.) % (b) How many food calories (in kcal) would a well-conditioned athlete metabolize in doing the same work with an efficiency of 25%? (Enter a number.) kcal
What is the efficiency of an out-of-condition professor who does 2.30 ✕ 105 J of useful work while metabolizing 490 kcal of food energy?% (b) How many food calories would a well-conditioned athlete metabolize in doing the same work with an efficiency of 15%?
Calculate the work done (in J) by an 80.0 kg man who pushes a crate 4.15 m up along a ramp that makes an angle of 20.0° with the horizontal. (See the figure below.) He exerts a force of 505 N on the crate parallel to the ramp and moves at a constant speed. Be certaln to Include the work he does on the crate and on his body to get up the ramp.
Ms. Dewitte's son, Theo, slides down a slide, from rest, with a length of 2.00 m at an incline of 50° above the horizontal. He has a mass of 22.0 kg and he reaches the bottom of the slide with a velocity of 2.90 m/s. Briefly explain if total mechanical energy was conserved and what energy transfers otcurred?
A 61.8-kg skateboarder starts out with a speed of 1.75 m/s. He does 80.4 J of work on himself by pushing with his feet against the ground. In addition, friction does -221 J of work on him. In both cases, the forces doing the work are non-conservative. The final speed of the skateboarder is 9.19 m/s. (a) Calculate the change (PEF - PEo) in the gravitational potential energy. (b) How much has the vertical height of the skater changed? Give the absolute value. (a) Number (b) Number i Units Units
An 7.6 kgkg crate is pulled 5.4 mm up a 30∘∘ incline by a rope angled 19 ∘ above the incline. The tension in the rope is 140 NN and the crate's coefficient of kinetic friction on the incline is 0.23.How much work is done by tension, by gravity, and by the normal force?What is the increase in thermal energy of the crate and incline?
(a) What is the efficiency of an out-of-condition professor who does 2.30 ✕ 105 J of useful work while metabolizing 510 kcal of food energy?(b) How many food calories would a well-conditioned athlete metabolize in doing the same work with an efficiency of 25%?
Calculate the work done (in J) by a 90.0 kg man who pushes a crate 4.30 m up along a ramp that makes an angle of 20.0° with the horizontal (see below). He exerts a force of 455 N on the crate parallel to the ramp and moves at a constant speed. Be certain to include the work he does on the crate and on his body to get up the ramp.
(2) The combined force of lift and thrust on a model airplane is a constant F = (4î + 3j + 6k) N. a. How much work is done by the force F if the displacement of the airplane is: A = (6î – 5j – 3k) m? %3D b. Will this force cause the airplane to speed up, slow down or maintain a constant speed?
Calculate the work done (in J) by a 75.0 kg man who pushes a crate 3.50 m up along a ramp that makes an angle of 20.0° with the horizontal (see below). He exerts a force of 465 N on the crate parallel to the ramp and moves at a constant speed. Be certain to include the work he does on the crate and on his body to get up the ramp.
Calculate the work done (in J) by a 75.0 kg man who pushes a crate 4.30 m up along a ramp that makes an angle of 20.0° with the horizontal. (See the figure below.) He exerts a force of 540 N on the crate parallel to the ramp and moves at a constant speed. Be certain to include the work he does on the crate and on his body to get up the ramp.
(a) What is the efficiency of an out-of-condition professor who does 2.00 × 105 J of useful work while metabolizing 510 kcal of food energy? (Enter your answer as a percentage. Enter a number.) % (b) How many food calories (in kcal) would a well-conditioned athlete metabolize in doing the same work with an efficiency of 20%? (Enter a number.) kcal