What are fossil fuels? How are coal and oil forms of solar energy?
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What are fossil fuels? How are coal and oil forms of solar energy?
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- 20. If 60 percent of the potential energy of water flowing over a dam can be converted to electricity, find the maximum power output, in kW (kilowatts), for a dam 50 m high where the water crosses at a rate of 300,000 kg/min (1 watt = 1 joule/sec, 1 kW = 1000 watts)For the roller coaster shown in the Chapter 4 opening photo, a hydraulic catapult propels the car to the top of the ride, at a height of 450 ft. If the car and its occupants weigh 1200 lb,(a) what would be the potential energy at the top of the ride?20. If 60 percent of the potential energy of water flowing over a dam can be converted to electricity, find the maximum power output, in kW (kilowatts), for a dam 50 m high where the water crosses at a rate of 300,000 kg/min (1 watt = 1 joule/sec, 1 kW = 1000 watts)
- 9. What is the difference between renewable energy and non-renewable energy and give one example of each: (keep it SHORT!!)9. In the figure, R₁ = 3 kn = R₂. If the power dissipated in R₁ and R2 are 90 mW and 10 mW, respectively, how much power is dissipated in R3? (1) 45 mW (2) 10 mW 3) 30 mW 4) 90 mW 20 mW R₁ E www R₂ R3A hiker of mass 73 kg is going to climb to the top of Mount Tam, which has an elevation of 2,574 ft. a) If the hiker starts climbing at an elevation of 545 ft, what will their change in gravitational potential energy be, in joules, once they reach the top? Assume the zero of gravitational potential energy is at sea level. b) Repeat the above calculation for the change in gravitational potential energy, but assume the gravitational potential is zero at the top of the mountain.