Three identical playdough balls collide, two of the clay balls come in at equal angles of 45 degrees and equal (unknown) speeds, and strike the third (stationary) ball simultaneously. All three stick together and move off together without rotating. There are no forces on the balls of clay other than those that they exert on each other. Find the fraction of the original energy of the system that becomes thermal?
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- A person can generate about 300 W of power on a treadmill. The treadmill is inclined at 2.80∘ and an 85.0-kg man runs at s2.90 m/s for 49.0 min. Calculate the percentage of the power output that keeps him moving on the treadmill, Ppercentage,moving. Calculate the percentage of the power output that goes into heating up his body, Ppercentage,heat. How much water mwater would that heat evaporate? Assume the water molecules that evaporate are at 100 ∘C.A block leaves a frictionless inclined surface horizontally after dropping off by a height hh. Find the horizontal distance DD where it will land on the floor, if h=4.4h=4.4 m and H=2.2H=2.2 m. Image Description D=D= m The potential energy function for either one of the two atoms in a diatomic molecule is often approximated by U(x)=ax6−bx3U(x)=ax6-bx3 where xx is the distance between the atoms. At what distance of separation does the potential energy have a local minimum (not at x=∞x=∞)? Express your answer algebraically.xmin=xmin= What is the force on an atom at this separation? F(x=xmin)=F(x=xmin)= N⦁ An engine has a hot reservoir that contains 20,000 J of heat energy at 3270 C, and a cold reservoir that contains 12,000 J of heat energy at 270 C. What is the relative efficiency of this engine?⦁ 80%⦁ 70%⦁ 60%⦁ 50%⦁ 40%
- The power output of a car engine running at 3000 rpm is 400 kW. Express your answer in kilojoules. ► View Available Hint(s) 8.00 kJ Submit Correct MODEL: Assume that the car engine follows a closed cycle. Previous Answers SOLVE: Since 3000 rpm is 50.00 cycles per second, the work output of the car engine per cycle is 1 Wout (400) (5.0) eycles) = 8.00 Part B V = How much heat is exhausted per cycle if the engine's thermal efficiency is 20.0%? Give your answer in kJ. Express your answer in kilojoules. ► View Available Hint(s) ΑΣΦ kJ cycle ? kJAn air-filled cylinder with a movable piston has a heat reservoir in contact with it. The heat reservoir transfers 850 ) of energy into the cylinder. Due to the energy transfer, the piston does 437 J of work on the environment. What is the change in internal energy of the system? A 1.9J 413 J 1287 J D 371 000 JA simple pendulum is suspended from the ceiling by means of a string and this time, the pendulum is 2.40 m long and has a mass of 3.23 kg. You give it a push away from vertical so that it starts swinging with a speed of 2.93 m/s. Due to friction at the pivot point, 1.00 Joule of the pendulum s initial kinetic energy is lost as heat during the upward swing. What maximum angle will it reach, with respect to the vertical, before falling back down? 39.5 degrees 33.8 degrees 35.1 degrees 43.9 degrees
- A Carnot engine uses a hot reservoir consisting of a large amount of boiling water and a cold reservoir consisting of a large tub of ice and water. When 6442 J of heat is put into the engine and the engine produces work, how many kilograms of ice in the tub are melted due to the heat delivered to the cold reservoir? Do not enter unit.please answer the following As a gasoline engine is running, an amount of gasoline containing 12,000 J of chemical potential energy is burned in 1 s. During that second, the engine does 4,000 J of work. What is the engine's efficiency (in percent)? The burning gasoline has a temperature of about 4,300°F (2,600 K). The waste heat from the engine flows into air at about 88°F (304 K). What is the Carnot efficiency (in percent) of a heat engine operating between these two temperatures?I Review I Constants One mole (6.02×1023 atoms) of helium atoms in the gas phase has 3700 J of microscopic kinetic energy at room temperature. Assume that all atoms move with the same speed. The mass of a helium Part A -27 atom is 6.68×10 kg. What is the speed of a helium atom? Express your answer with the appropriate units. ? HA Value Units V = Submit Request Answer Provide Feedback Next >
- Consider a situation where you carry a 20-N box up a flight of stairs, raising its elevation by 5 m. When the box hits the floor its kinetic energy is converted into internal energy. O True False O IIA graduate student leaves a cylinder of carbon dioxide sitting in the sun. The cylinder absorbs 25.2 J of energy while sitting in the sun. A piston in the cylinder moves upward. The carbon dioxide did 12 J of work on the piston to move it upward. Find the change in internal energy of the carbon dioxide.a rock with mass0.15kg is placeedin a sling shot and the elastic band of the sling shot is stretched by 70 cm from its relaxed position to store elastic potential energy in it. the spring constant of the elastic band is 28,5 N . the elastic band is then released to launched the rock. what is the speed of the rock when it leaves the sling shot if a) no heat is produced when the Celtic band is released? b: 2.8 J of heat energy are produced when the elastic band is released?