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Energy and Power
Page 3
Questions (142)
How do i calculate how much time it takes to heat water?
All I know is the power supplied and the energy required. Thanks power=
1 answer
asked by
barbara
735 views
An 80 kg man climbs a 50 m-high hill in 20 minutes. What is the average power in watts he expends climbing the hill?
2 answers
asked by
Anonymous
720 views
A battery operated flashlight is turned on. What energy transformations take place and how does the amount of energy in the
1 answer
asked by
Judith
683 views
Four rivers have the same volume of water flow over time but fall from different heights to power hydroelectric dams. Which dam
1 answer
asked by
Bella
49 views
a car runs 44 km using 11/4 litre of petrol.how much distance will it cover in 1 litre of petrol?
4 answers
asked by
shehzad
614 views
Water drops over 49 m high Niagara Falls at the rate of 6.0 106 kg/s. If all the energy of the falling water could be harnessed
2 answers
asked by
Anonymous
605 views
The average power output of a human heart is 1.3 3 Watts.
You had to pay for this energy at Wis consin Energy’s rate of
2 answers
asked by
Meder
620 views
The equation for photon energy, , is
where = 6.626×10−34 (Planck's constant) and = 3.00×108 (the speed of light). What is the
2 answers
asked by
Trina
620 views
Water flows over the edge of a waterfall at a rate of 1.2 x 106 kg/s. There are 50.0 m between the top and bottom of the
2 answers
asked by
Guy M.
620 views
1. An electric pump, used to obtain water from 20 metres below the ground, is marked 5000W.
a) If the pump operates as rated, how
3 answers
asked by
Jeffrey
621 views
Assuming 95.0% efficiency for the conversion of electrical power by the motor, what current must the 12.0 V batteries of a 740
1 answer
asked by
Justin
592 views
4.28) A. Calculate the horsepower needed for a 1200 kg car to climb to an altitude of 1000 m from sea level in 1 hr.
B. If the
2 answers
asked by
Sean Francis C. Nocete
576 views
a bike is 25% efficient in converting energy of the bicyclist to mechanical energy. If a cyclist is travelling along a pathway
3 answers
asked by
Francis
554 views
Water flows over a section of a waterfall at the rate of 4.9 104 kg/s and falls 36 m. How much power is generated by the falling
2 answers
asked by
MRock
560 views
How many joules are taken in by a man who eats 4000 calories of food each day? What is this person's average thermal power
3 answers
asked by
Debra
538 views
A farmer wants to capitalize on the amount of sunlight shining on his farm everyday by building a solar power tower. The
2 answers
asked by
Kara
505 views
This problem compares some energy properties of two motor vehicles: For efficient car, use drag coefficient of .21 and a cross
2 answers
asked by
Lo
510 views
A total of 10000kg of water per second flows over a waterfall 30m high.If half of the power this flow represents could be
2 answers
asked by
Ania
505 views
A bulb is joined to a battery of e.m.f 6V. A steady current of 0.5 A flows through circuit. Calculate the total energy provided
2 answers
asked by
paresh
498 views
The electric motor of a model train accelerates the train from rest to 0.700 m/s in 17.0 ms. The total mass of the train is 670
1 answer
asked by
Anonymous
495 views
While running, a person dissipates about 0.60 J of mechanical energy per step per kilogram of body mass. If a 61-kg person
2 answers
asked by
Anonymous
502 views
In the design of a passenger bus, it is proposed to derive the motive power from the energy stored in a flywheel. The flywheel,
1 answer
asked by
Edwin
487 views
Note: One horsepower is equal to 746 watts.
An automobile engine delivers 53.1 hp. How much time will it take for the engine to
1 answer
asked by
Kethe
490 views
An Electricity account shows that a household has used 1400 units of electrical energy during a three month period. Calculate :
a
1 answer
asked by
Nelly
472 views
The electric motor of a model train accelerates the train from rest to 0.755 m/s in 19.5 ms. The total mass of the train is 875
1 answer
asked by
Emily Tran
442 views
How do you figure out the efficiency of a system?
In one sentance
1 answer
asked anonymously
13 views
An electric company compared the speed of wind and the number of power outages. The electric company determined the correlation
1 answer
asked anonymously
12 views
how does a Power Plant create electricity using a generator? simple answer
1 answer
asked anonymously
55 views
How does a powerplant create electricity using a generator?
1 answer
asked anonymously
16 views
hiow wind power is produced
1 answer
asked anonymously
6 views
Two different rivers have drops that are the same height. In river A this drop of the river is a waterfall. In river B this drop
1 answer
asked anonymously
38 views
What is the potential danger from an accident at a nuclear power plant?
Responses Entire cities could be wiped out Entire cities
1 answer
asked by
emilymay_2356
27 views
For powerscaling, how much could 2.68 x 10^15 joules destroy
1 answer
asked anonymously
23 views
Where does fission regularly occur and what kind of energy is produced?
Responses Fission occurs in a nuclear power plant. The
1 answer
asked anonymously
11 views
Which of the following is NOT a risk associated with nuclear power?
There are reactor accidents. It is a renewable energy
1 answer
asked by
john
13 views
A city gets its electricity from a dam, where water is stored in a reservoir. How does the water provide the city with its
1 answer
asked by
Blue Berry
79 views
Two rivers have the same volume of water flow over time but fall from different heights to power hydroelectric turbines. Which
1 answer
asked by
random
26 views
If you are given time and distance, you can determine power if you know
force energy joules watts
1 answer
asked anonymously
12 views
Wind farms are a source of renewable energy found around the world. The power P (in kilowatts) generated by a wind turbine
1 answer
asked anonymously
21 views
what is the dimension of power
1 answer
asked by
gfitivnkif
5 views
What are the units of power?
a. Watts b. Joules c. Newton-meters (N·m) d. Ampere
1 answer
asked by
ariianqtor
3 views
If a force of 50 N moves an object a distance of 5 m in 10 s, what is the power output?
a. 250 W b. 50 W c. 10 W d. 5 W
1 answer
asked by
ariianqtor
2 views
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Parent Categories (11)
Electricity and Magnetism
Environment and Infrastructure
Fluid Mechanics
Forces and Motion
Mechanics
Mechanics/Forces
Physics
Physics/Electrical Engineering
Science and Physics
Science and Technology
Technology and Science