Hi! Please help answer and understand these problems... THANK YOU! 1. Kurdapya, a grade 12 STEM student is helping her sister solve this problem. How fast is an oxygenmolecule moving if it is in a room temperature with a mass of 3.31 x 10-26 kg and has a KE ofabout 7.21 x 10-21 J . Let us help her calculate the answer?2. Kurdapya successfully solved the answer so she has time to visit her mini gym. She lifts an object thatweighs 350 N to a height of 3.5 m. How much work is done in lifting the object? If she wants to liftthe object in just 5 s, at what rate is the work done?3. Kurdapya then went to their playground to play tennis when she noticed that her tennis ball has amass of 500 g. If she holds the ball above the ground at a height of 2.5 m to serve, what is itsgravitational potential energy?4. It's 5:00 PM and Kurdapya needs to finish her physics module, one of the problems states that arocket and a spacecraft were attached and has a combined mass of 3.8 x 105 kg and is to reach aspeed of 12.3 km/s, she needs to know how much kinetic energy will it have.5. The next day, Kurdapya craved for some riped guava fruit. She has to climb the guava tree howevershe realized that she is already 65 kg and the tree is 7.2 meters high. Let us calculate the powerrequired for her to climb the tree in 15 seconds.

1. Kurdapya, a grade 12 STEM student is helping her sister solve this problem. How fast is an oxygen molecule moving if it is in a room temperature with a mass of 3.31 × 10-26 kg and has a KE of about 7.21 x 10-2¹ J. Let us help her calculate the answer?

1. Kurdapya, a grade 12 STEM student is helping her sister solve this problem. How fast is an oxygen molecule moving if it is in a room temperature with a mass of 3.31 × 10-26 kg and has a KE of about 7.21 x 10-2¹ J. Let us help her calculate the answer?

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter11: Energy In Thermal Processes

Section: Chapter Questions

Problem 4P

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Similar questions

Under normal conditions the human heart converts about 13.0 J of chemical energy per second into 1.30 W of mechanical power as it pumps blood throughout the body. (a) Determine the number of Calories required to power the heart for one day, given that 1 Calorie equals 4 186 J. (b) Metabolizing 1.00 kg of fat can release about 9.00 103 Calories of energy. What mass of metabolized fat would power the heart for one day?
A student has the idea that the total work done on an object is equal to its final kinetic energy. Is this idea true always, sometimes, or never? Ii it is sometimes true, under what circumstances? If it is always or never true, explain why.
(a) Calculate the energy in kJ used by a 55.0-kg woman who does 50 deep knee bends in which her center of mass is lowered and raised 0.400 m. (She does work in both directions.) You may assume her efficiency is 20%. (b) What is the average power consumption rate in watts if she does this in 3.00 min?
(a) How long can you rapidly climb stairs (116/min) on the 93.0 kcal of energy in a 10.0-g pat of butter? (b) How many flights is this if each flight has 16 stairs?
If you run down some stairs and stop, what happens to your kinetic energy and your initial gravitational potential energy?
A system consists of three particles, each of mass 5.00 g, located at the corners of an equilateral triangle with sides of 30.0 cm. (a) Calculate the gravitational potential energy of the system. (b) Assume the particles are released simultaneously. Describe the subsequent motion of each. Will any collisions take place? Explain.
(a) How fast must a 3000-kg elephant move to have the same kinetic energy as a 65.0-kg sprinter running at 10.0 m/s? (b) Discuss how the larger energies needed for the movement of larger animals would relate to metabolic rates.
(a) What is the efficiency of an out-of-condition professor who does 2.10105J of useful work while metabolizing 500 kcal of food energy? (b) How many food calories would a well-conditioned athlete metabolize in doing the same work with an efficiency of 20%?
(a) Calculate the work done on a 1500-kg elevator car by its cable to lift it 40.0 m at constant speed, assuming friction averages 100 N. (b) What is the work done on the lift by the gravitational force in this process? (c) What is the total work done on the lift?
Energy is conventionally measured in Calories as well as in joules. One Calorie in nutrition is 1 kilocalorie, which we define in Chapter 11 as 1 kcal = 4 186 J. Metabolizing 1 gram of fat can release 9.00 kcal. A student decides to try to lose weight by exercising. She plans to run up and down the stairs in a football stadium as fast as she can and as many times as necessary. Is this in itself a practical way to lose weight? To evaluate the program, suppose she runs up a flight of 80 steps, each 0.150 m high, in 65.0 s. For simplicity, ignore the energy she uses in coming down (which is small). Assume that a typical efficiency for human muscles is 20.0%. This means that when your body converts 100 J from metabolizing fat, 20 J goes into doing mechanical work (here, climbing stairs). The remainder goes into internal energy. Assume the students mass is 50.0 kg. (a) How many times must she run the flight of stairs to lose 1 pound of fat? (b) What is her average power output, in watts and in horsepower, as she is running up the stairs?
Shoveling snow can be extremely taxing because the arms have such a low efficiency in this activity. Suppose a person shoveling a footpath metabolizes food at the rate of 800 W. (a) What is her useful power output? (b) How long will it take her to lift 3000 kg of snow 1.20 m? (This could be the amount of heavy snow on 20 m of footpath.) (c) How much waste heat transfer in kilojoules will she generate in the process?
A block of mass m = 200 g is released from rest at point along the horizontal diameter on the inside of hemispherical bowl of radius R = 30.0 cm, and the surface of the bowl is rough (Fig. P8.23). The blocks speed at point is 1.50 m/s. Figure P8.23 (a) What is its kinetic energy at point ? (b) How much mechanical energy is transformed into internal energy as the block moves from point to point ? (c) Is it possible to determine the coefficient of friction from these results in any simple manner? (d) Explain your answer to part (c).