Answered: A family uses 8 kW of power, (a) Direct… | bartleby

Related questions

Question

A family uses 8 kW of power, (a) Direct solar energy is incident on the horizontal surface at an average rate of 200 W per square meter. If 20% of this energy can be converted to useful electrical energy, how large an area is needed to supply 8 kW? (b) Compare this area to that of the roof of a typical house.

Expert Solution

Step by step

Solved in 2 steps

SEE SOLUTION Check out a sample Q&A here

Blurred answer

Similar questions

As a gasoline engine is running, an amount of gasoline containing 16,000 J of chemical potential energy is burned in 1 s. During that second, the engine does 4,000 J of work. (a) What is the engine's efficiency (in percent)? % (b) The burning gasoline has a temperature of about 4,100°F (2,500 K). The waste heat from the engine flows into air at about 82°F (301 K). What is the Carnot efficiency (in percent) of a heat engine operating between these two temperatures? %
Why do we not use brakes with more than 80% efficiency in automobiles? Whatshould be the minimum stopping distance for a car running at 80 kph?
As a gasoline engine is running, an amount of gasoline containing 13,600 J of chemical potential energy is burned in 1 s. During that second, the engine does 3,400 J of work. (a) What is the engine's efficiency (in percent)? % (b) The burning gasoline has a temperature of about 4,100°F (2,500 K). The waste heat from the engine flows into air at about 90°F (305 K). What is the Carnot efficiency (in percent) of a heat engine operating between these two temperatures? Need Help? % Read It
In the figure, a 3.2 g ice flake is released from the edge of a hemispherical bowl whose radius ris 19 cm. The flake-bowl contact is frictionless. (a) What is the speed of the flake when it reaches the bottom of the bowl? (b) If we substituted a second flake with 5 times the mass, what would its speed be? (c) If, instead, we gave the flake an initial downward speed 0.51 m/s along the bowl, what would the answer be? Ice flake-
In the figure, a 2.8 g ice flake is released from the edge of a hemispherical bowl whose radius r is 21 cm. The flake-bowl contact is frictionless. (a) What is the speed of the flake when it reaches the bottom of the bowl? (b) If we substituted a second flake with 5 times the mass, what would its speed be? (c) If, instead, we gave the flake an initial downward speed 1.2 m/s along the bowl, what would the answer be? Ice flake (a) Number i Units (b) Number i Units (c) Number i Units
Solar panels are rated by their theoretical maximum output capacity. A 2-kW PV panel would theoretically produce 2 kW of electricity at its maximum output (during peak solar radiance). If the average daily peak sun-hours in Philadelphia are approximately 4.0 hr and a rowhome is outfitted with 10 PV panels each having a capacity of 260 W, how much energy (kilowatt x hours) would be generated in one year (in units of kWh/year)?
In the figure, a 2.6 g ice flake is released from the edge of a hemispherical bowl whose radius r is 16 cm. The flake-bowl contact is frictionless. (a) What is the speed of the flake when it reaches the bottom of the bowl? (b) If we substituted a second flake with 4 times the mass, what would its speed be? (c) If, instead, we gave the flake an initial downward speed 0.62 m/s along the bowl, what would the answer be?
Using Kirchoff's Rules determine power dissipated by R4 if: R1: 8ohm, R2: 4ohm, R3: 14ohm, R4: 10ohm, R5: 12ohm, V1: 11V, V2: 14V
As a gasoline engine is running, an amount of gasoline containing 18,500 J of chemical potential energy is burned in 1 s. During that second, the engine does 3,700 J of work. (a) What is the engine's efficiency (in percent)? % (b) The burning gasoline has a temperature of about 4,100°F (2,500 K). The waste heat from the engine flows into air at about 90°F (305 K). What is the Carnot efficiency (in percent) of a heat engine operating between these two temperatures? %
Rub your hands together vigorously. What happens? Discuss the energy transfers and transformations that take place.
b) Energy may be stored for use during peak demand by pumping water to a high reservoir when needed. Suppose water is pumped to a lake 135 m above the turbines and at a rate of 1.35 x 10 kgs" for 10 hrs at night. ) How much energy (kWh) is needed to do this each night. i) If all this energy is released during a-14 h day, at 75% efficiency, what is the average power output? e) State three forms of environmental polution and how they can be prevented.
A previous part of the question says that the total electrical energy the battery can produce is 5832000 Joules. The battery has a mass of 18.1 kg. What total mass of such batteries would be required to deliver the same effective mechanical energy as 12 gallons of gasoline? Assume that the efficiency of an electrically powered car is 2.5 times that of a gasoline-powered car for the conversion to mechanical energy, and that energy content of 1 gallon of gas =1.32×10^8 Joules.

SEE MORE QUESTIONS