A 1000W electric kettle contains 1200g of water at 25*C. In how many minutes after the power is switched on is 200 g left in the kettle?

Q: How much energy would you consume daily if you kept a lightbulb of 20 watts on all day long?

A: A lightbulb is rated as 20 Watt which is indicating the power of the bulb.  P = E/t  Power is…

Q: Suppose you have a car with a 100-hp engine. How largea solar panel would you need to replace the…

A: Let A be the area of the solar panel needed. The power required can be written as, P=AηPr Here, η is…

Q: If a battery can release 511 J of energy and 475 J are used for work, how much energy is released as…

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Q: Calculate the time taken by a 60 bulb to consume 3000 J of energy.

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Q: A heat engine has a solar collector receiving 600 Btu/h per square foot, inside which a transfer…

A: Transfer medium is heated to 800R and  collected energy power heat is 100F engine deliver heat 8500.…

Q: A coal- burning steam locomotive heats steam to 180°C and exhausts it at 100°C. During 1 s of its…

A: Refer Table “Heat engine efficiencies. Typical input and exhaust temperatures, ideal (best possible)…

Q: (II) (a) How much energy is required to bring a 1.0-L pot ofwater at 20°C to 100°C? (b) For how long…

A: Given The volume of the water is 1 L. The initial temperature of the water is 20o C. The final…

Q: To keep warm outdoors, your run a 1287W generator for 4 minutes to make yourself a 297mL cup of tea.…

A: Variables known, Power of the generator is 1287W, Time the generator ran is 4 minutes, Mass of cup…

Q: 6) (a) The United States, with a population of 2.2×10* people, consumes 5×10 1º J per year. What is…

A: Question 6  Given population, P = 2.2× 108  Consume energy, E = 5×1019 per year  Sun radiation…

Q: A worker drives a 0.500 kg spike into a rail tie with a 2.50 ksledgehammer. The hammer hits the…

A: The expression for kinetic energy (KE) KE = 12× Mass (m) × {speed (v)}2

Q: 600 J of heat energy are transferred to a system that does 400 J of work. By how much does the…

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Q: An electric refrigerator rated 400 W operates 8 hour/day. What is the cost of the energy to operate…

A: The power of the refrigerator is 400W. The total time operated by the refrigerator is,

Q: C7 21.) If a hair dryer is rated at 1300 W, how much energy does it require in 6 minutes?…

A: Power=Work/time Work=Power X time

Q: 2. A stove has a power rating of 8.00 x10³ W. The energy transferred to a pan of water during a…

A: (2): Given: The power rating is 8x103 W. The transferred energy is 3.25x105 J. The time interval is…

Q: An aluminium rod is 20 cm long at 20c and has a mass of 350 g. If 100000 j of energy is added to…

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Q: If a 71.0 kgkg hiker eats one of these bars, how high a mountain must he climb to "work off" the…

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Q: Ina small dam, water flows at a rate of 2500 kg/s and falls 30 m. After calculating the power wasted…

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Q: A 150-g aluminum cup contains 750 g of water in thermal equilibrium with the cup at 90°C. The…

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Q: Why do we not use brakes with more than 80% efficiency in automobiles? What should be the minimum…

A: we do not use brakes with more than 80% efficiency in automobiles

Q: Q38. Q38. How much energy does a 150 W steam iron consume per second? O 15 W O 15 J O 150 J O 0.15 J

A: Answer  150 J

Q: If a CD player uses electricity at a rate of 14 W, how much energy does it use during an 9 hour day?…

A: Power = 14 W Time = 9 hours Using formula , Power = energy /time 14W = energy/9hours Energy = 14 * 9…

Q: 4. A 30 W light bulb is left on for 8 hours overnight, how much energy was wasted? ANSWER THIS IN…

A: Given: Power P=30 W Time  t=8 hours=8×60×60=28800 s

Q: A worker drives a 0.500 kg spike into a rail tie with a 2.50 kg sledgehammer. The hammer hits the…

A: The concepts used to solve this problem are kinetic energy and internal energy. Initially, use the…

Q: A furnace supplies 36.0 kW of thermal power at 230 C to an engine that exhausts waste energy at 20.0…

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Q: Suppose you have a 1000Wmicrowave that you need to run for 5minto heat up your dinner.1. How much…

A: Power "P" = 1000 W      Time "t"= 5 mins

Q: My computer uses 15 W, if I run it for 3 hours how many Joules have I used?

A: Given:         Power used by computer = 150W       Time it's running = 3 hrs= 3× 60 × 60 sec…

Q: 3. How long must a 400 W electrical engine work in order to produce 300 kJ of work?

A: GivenPower of electrical engine, P=400 WWork done , W=300 kJ

Q: The energy of 723 BTU is supplied to a blower per minute. How much power (in kW) is supplied for…

A: Given: The energy (E) of 723 BTU is supplied to a blower per minute. Introduction: The power (P) of…

Q: A hot gas is injected into an engine at 300°C and exhausts at 70°C . What is the highest efficiency…

A: We have a heat engine in which a hot gas is injected at a temperature T1=300oC=573 K and the gas…

Q: In order to keep a basement from flooding, it is necessary to pump 285 kg of water each minute from…

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Q: What is the work that a 45 W light bulb can do in five minutes? O 390 kJ O 13.5 kJ O 216 kJ O 160 kJ

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Q: On a trip, you notice that a 4.64-kg bag of ice lasts an average of one day in your the average…

A: GivenMass of ice bag, m=4.64 kg

Q: A 3.00 g lead bullet at 40oC is fired at a speed of 250m/s into a large block of ice at 0o C, in…

A: We are allowed to give the explanation of first question only which is given below.  Please repost…

Q: A 3kW immersion heater is used to raise a 500g container of water from 20 degrees Celsius to 30…

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Q: A sample of 5.25 kilograms of water at 6.00°C is placed in the freezer. Assuming all energy removed…

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Q: If a typical city consumes electrical energy at a rate of 2.0 GW (that's 2 billion joules per…

A: Given data The power is given as P = 2 GW. The time duration is given as t = 14 weeks. The speed of…

Q: 43) The compressor in a refrigerator performs 580 J of work to remove 160 J of heat from the…

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Q: Calculate the time taken 34 w bulb 10 consume 21.00 J of energy?

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Q: An engine is able to do 1000 J of work. How much heat would need to be added for it to be as…

A: Given:- An engine is able to do 1000 J of work. How much heat would need to be added for it to be as…

Q: 1. A 210 W heater is placed in 2kg of water and switched on for 200 s, how much energy is needed to…

A: Given Data : The power of the heater is given as P = 210W. The mass of the water is given as m =…

Q: you are standing 2.5 m from a 150-W lightbulb. If the pupil of your eye is a circle 5.0 mm diameter,…

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Q: Q1. 1 Jis the energy required to do of work. O 1N O 1J O 9.8 N O 98 J

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Q: An aluminum rod is 30cm long at 33°C and has a mass of 330g. If 13,000 J of energy is added to the…

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Q: To keep warm outdoors, your run a 1118W generator for 4 minutes to make yourself a 300mL cup of tea.…

A: Efficiency=output energyinput energy×100

Q: A 440 kW of reftigerator working in a room at 35 °C and rejects 450 kj/s. Extimate the temperature…

A: Given data: Work output from the refrigerator is, W=400 kW=400 kJ/s=400×103 J/s. Temperature of room…

Q: Compute the work done against gravity by a pump that discharges 600 L of fuel oil into a tank 20 m…

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Q: How can a 50-W light bulb use more energy than a 1000-W oven?

A: A 50-W light bulb can use more energy than 1000-W oven when the time period of lightning of bulb…

Q: A particular car does work at the rate of about 7.0 k J/swhen traveling at a steady 21.8 m/s  along…

A: Given:The rate of doing work is W=7 kJ/s  The velocity is v=21.8 m/s The distance d=17 km the volume…

Q: Why 2200 m/s was changed to 22 W ? Can't we solve with using the 2200 m/s?

A: given,m=1.67×10-27 kgh=6.626×10-34 Js

Relativistic Energy and Momentum

According to classical physics, time flow is the same for every observer. But according to einstein's theory, time flow is different for different observers. The idea that time flow is not the same for all may sound strange because we may not experience this effect in everyday life. This effect is only observed when an object moves with some velocity comparable to the velocity of light. This velocity is termed relativistic velocity.