COLLEGE PHYSICS
2nd Edition
ISBN: 9781464196393
Author: Freedman
Publisher: MAC HIGHER
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Chapter 6, Problem 14QAP
To determine
What types of energy that are associated with the "circuit" that a snowboarder follows from the bottom of a mountain, to its peak, and back down again.
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A) Explain the Law of Conservation of Energy in the context of this
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A factory has a ventilation system with a fan motor that has a 2½ horsepower motor. The fan must run continually, 24 hours a day, seven days a week. Assume a 30-day month and a cost of $0.16 per kilowatt-hour (kWh). What is the monthly cost to operate this system for the factory? (1 horsepower = 746 W)
When a battery provides power to a hand-held fan, what kinds of energy are present and how do they change? Give me a step-by-step explanation in complete sentences with as much detail as you can. Also tell me the type of motion is happening when the fan works, remember it's a hand-held fan.
Chapter 6 Solutions
COLLEGE PHYSICS
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- What is the difference between energy conservation and the law of conservation of energy? Give some examples of each.arrow_forwardThere is a 5K event coming up in your town. While talking to your grandmother, who uses an electric scooter for mobility, she says that she would like to accompany you on her scooter while you walk the 5.00-km distance. The manual that came with her scooter claims that the fully charged battery is capable of providing 120 Wh of energy before being depleted. In preparation for the race, you go for a test drive: beginning with a fully charged battery, your grandmother rides beside you as you walk 5.00 km on flat ground. At the end of the walk, the battery usage indicator shows that 40.0% of the original energy in the battery remains. You also know that the combined weight of the scooter and your grandmother is 890 N. A few days later, filled with confidence that the battery has sufficient energy, you and your grandmother drive to the 5K event. Unbeknownst to you, the 5K route is not on flat ground, but is all uphill, ending at a point higher than the starting line. A race official tells you that the total amount of vertical displacement on the route is 150 m. Should your grandmother accompany you on the walk, or will she be stranded when her battery runs out of energy? Assume that the only difference between your test drive and the actual event is the vertical displacement.arrow_forwardA large household air conditioner may consume 15.0 kW of power. What is the cost of operating this air conditioner 3.00 h per day for 30.0 d if the cost of electricity is $0.110 per kW h?arrow_forward
- Make an order-of-magnitude estimate of your power out-put as you climb stairs. In your solution, state the physical quantities you take as data and the values you measure or estimate for them. Do you consider your peak power or your sustainable power?arrow_forwardThe change in the total energy of a body moving because of work being done on it is attributed by the change in kinetic energy only when ______ a) It moves extremely slowly b) It moves with a very high velocity c) It moves on an equipotential surface d) It moves with a positive accelerationarrow_forward26-30. The ski slopes at Bluebird Mountain make use of tow ropes to transport snowboarders and skiers to the summit of the hill. One of the tow ropes is powered by a 22-kW motor which pulls skiers along an icy incline of 14° at a constant speed. Suppose that 18 skiers with an average mass of 48 kg hold onto the rope and suppose that the motor operates at full power. A. Determine the cumulative weight of all these skiers. B. Determine the force required to pull this amount of weight up a 14° incline at a constant speed. C. Determine the speed at which the skiers will ascend the hill.arrow_forward
- Haliade-X 12 MW is one of the most powerful offshore wind turbines in the world and it will be installed in the New Jersey offshore area (Figure 1). Energy storage is a long-time problem for wind energy, because the period of wind power is not necessary at the peak of electricity demand. To match the power supply and demand, the generated energy has to be stored either in battery or other forms. There is an idea to use the tower of the wind turbine as energy storage – sea water is pumped to the top of the tower when power generation is more than demand; and water is released to drive a generator at the base of the tower to supply energy when it is needed. Assume the turbine tower is 20 m below the sea bottom and the water depth is 30 m, and the tower is filled by sea water (density = 1030 kg/m3). Answer the questions below (make sure your answer is in both gauge pressure and absolute pressure form). At the mean sea level, how much is the pressure between inside and outside the…arrow_forwardUnder what conditions can you apply the law of conservation of energy?arrow_forwardChallenge - Solar Panels and Sunlight You are part of an expedition traveling through space. You have a space ship with solar panels on it. These solar panels are square and have a side length of L = 4.00 m absorb energy and convert 45.0 % of the light energy from the sun into electrical energy for your ship. Currently your ship is a distance R = 8.50 x 107 km away from the Sun. The Sun has a power of 3.85 x 1026 w. How long (time) does it take these solar panels to store 20.0 x 108 J of energy? Please list your answer in hours! Make sure to put your answer in the correct units and in an appropriate number of significant figures. Your Answer:arrow_forward
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