Physics, 16.07.2019 21:20 yasminnishkan
Energy is conventionally measured in calories as well as in joules. one calorie in nutrition is one kilocalorie, defined as 1 kcal = 4 186 j. metabolizing 1 g of fat can release 9.00 kcal. a student decides to try to lose weight by exercising. he plans to run up and down the stairs in a football stadium as fast as he can and as many times as necessary. to evaluate the program, suppose he runs up a flight of 100 steps, each 0.150 m high, in 61.0 s. for simplicity, ignore the energy he uses in coming down (which is small). assume that a typical efficiency for human muscles is 20.0%. therefore when your body converts 100 j from metabolizing fat, 20 j goes into doing mechanical work (here, climbing stairs). the remainder goes into extra internal energy. assume that the student's mass is 74.0 kg. (a) how many times must the student run the flight of stairs to lose 1.00 kg of fat?
Answers: 1
Physics, 21.06.2019 21:30
Look at the potential energy diagram for a chemical reaction. which statement correctly describes the energy changes that occur in the forward reaction?
Answers: 1
Physics, 22.06.2019 02:30
Mass (kg) force (n) 5 25 10 50 15 75 20 100 a student was trying to find the relationship between mass and force. he placed four different masses on a table and pulled them using a spring scale. the table shows the different masses used in the experiment and the force required to pull each mass. the student concluded that more force was required to pull heavier objects. what comment would you make regarding his conclusion? a) no clear relation can be observed between mass and force from the data. b) there is a direct proportion between the mass and force listed in the table. c) gravity should have been taken into account while performing the experiment. d) there is an inverse proportion between the mass and force listed in the table.
Answers: 2
Physics, 22.06.2019 09:30
In a heat engine if 1000 j of heat enters the system the piston does 500 j of work, what is the final internal energy of the system if the initial energy was 2000 j? 1. write the equation 2.list out your known variables 3.plug the numbers into the equations 4.solve 5.write your solution statement that includes initial energy and final
Answers: 3
Physics, 22.06.2019 11:50
The mass of the sun is 1.99×1030kg and its distance to the earth is 1.50×1011m. what is the gravitational force of the sun on the earth?
Answers: 3
Energy is conventionally measured in calories as well as in joules. one calorie in nutrition is one...
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