A motor operates at its rated load of 10hp for 8hrs a day. Its efficiency is 87%. What is the daily cost operation if electric energy costs $0.10/kw-hr?

Q: A pumped water storage plant has a head of 600 m and volume 5 x 10° m². How much potential energy is…

A: Height of Storage tank equal to 600 metre

Q: What is the Kinetic Energy of a 478 kg object that is moving with a speed of 15 m/s?

A: The mass of the object, m=478 kg   The velocity of the object, v=15 m/s

Q: A small car has a mass of 800 kg, and its efficiency is 14%. How much energy is transferred from the…

A: Conservation of energy theorem states that energy cannot be created or destroyed. It can only be…

Q: What is the maximum amount of work that a 600-W motor can do in 10 seconds?

A:

Q: A light bulb produces 400J of light energy and is 20% efficient. How much energy does it use?

A:

Q: The kinetic energy of a 68 -kg athlete running at a velocity of 4.5 m/s is about

A: Given  Mass of athlete = m = 68 kg  Velocity of athlete = v = 4.5 m/s  The kinetic energy is to be…

Q: What is the cost of operating a 3.00-W electric clock for a year if the cost of electricity is…

A: The number of hours for which the clock is operated can be obtained as 1 year=1year×365 days1year×24…

Q: The kinetic energy of a 68 -kg athlete running at a velocity of 4.7 m/s is about

A:

Q: If an input of 100 J in a pulley system increases the potential energy of a load by 60 J, what is…

A: Given that Input energy = 100 J Output energy = 60 J

Q: A winch is driven by a 4.0 kW electric motor and is lifting a load of 400 kg to a height of 5.0 m.…

A: Formula of efficiency is as follows: η(%)=PoPin×100…

Q: How much time is required for a car engine to do 278 kJ of work, if its maximum power is 95 kW?

A:

Q: A lightbulb has an average power output of 125 watts. If the lightbulb is left on for an hour, what…

A: Given: The power output of the lightbulb is 125 W. The running time of the bulb is 1 hour.…

Q: A force of 1050 N is needed to move a crate weighing 3050 N up a ramp that is 3.89 m long. If the…

A:

Q: What is the yearly cost, in dollars, of operating such a clock if the cost of electricity is $0.125…

A: Power of clock (P) = 3.1 W cost of electricity = $0.125 per kWh

Q: If a crane does 350J of work on a beam in 6 seconds, what is the crane's power?

A: Given The Work done by the crane is W = 350 J. The time up to which work is done is t = 6 s. The…

Q: What is the work output of a machine with 62% efficiency with an in- put of 537 J? A 870 J 33 000 J…

A:

Q: A light bulb has 75% efficiency. How much energy is wasted if the useful output energy of the bulb…

A: Given data: Efficiency η=75% The output energy of the bulb =24J

Q: A small car has a mass of 800 kg, and its efficiency is 14%. How much energy is transferred from the…

A:

Q: The engine of a machine can deliver 947J of energy to the machine in 63 seconds.  What is the power…

A: The energy delivered by the engine is, E=947 J The time duration to deliver the energy is, t=63 s

Q: If a person consumes 2000 Calories (kcal) per day, how many watts of power can they generate,…

A: Answer:-  Given  Energy consume (E) = 2000 kcal  ( 1 kcal = 4184 J )  E = 2000 × 4184 = 8368000 J…

Q: How long will it take a 25 W machine to produce 438 J of work?

A: Power(p)= Work/Time So, Time = Work/Power

Q: What is the efficiency (in percent) of a subject on a treadmill who puts out work at the rate of 147…

A: Given: The power output of the treadmill is 147 W. The oxygen consumption is 2.28 L/min.

Q: A computer uses 1.62 x 10^4 J in one hour. What is the power used?

A: The energy usage of device is 1.62 ×104J in one hour.    Power is the rate with respect to time at…

Q: A person goes up a flight of stairs in 20 s. If the person weighs 600 N, and the vertical height of…

A:

Q: For exercise, an athlete lifts a barbell that weighs 400 N from the ground to a height of 2.20 m at…

A: Given data:  Weight (mg) = 400 N Height (h) = 2.20 Time (t) = 1.60 s Required: The metabolic energy…

Q: What is the wattage of a light bulb that uses 35 J of energy in 7 s?

A: given,  Energy = 35 J  time = 7 s  Therefore, the wattage of the light bulb               =…

Q: A crane lifts a 320 kg crate up a height of 6.5 m. The crane uses 17 kJ of energy to lift this…

A: in above question we to find the efficiency of crane.

Q: A clothes dryer uses 3000 W and is run fro 1 hour. If the total useful energy to dry the clothes is…

A: Given: Power of the dryer P= 3000 W  time to use dryer = 1 hour  Total useful energy to dry the…

Q: A pitching machine uses 122J of energy to throw a baseball with a mass of 0.145kg at a speed of 36.0…

A: Power is ratio of energy divided by time.  P=Et Power is measured in watt.

Q: A 35-kW freight elevator with a total mass of 1950 kilograms rises to a height of 25 metres in 32…

A: Actual power required= 35k watt Height gain during the operation= 25 m to find the efficiency of…

Q: What is the average power consumption in watts of an appliance that uses 6.62 kW · h of energy per…

A: We know that the appliance uses 6.62 kW.h of energy per day and in this question, we need to…

Q: A worker slides a block of wood along a surface. The work output is determined to be 5.85 x 103 J…

A:

Q: How much energy does it take to drive a 200 Hp car at 20 % power for 3 hours if it is 12 %…

A: Given Power rating of car = 200 Hp = 200 × 746 W Output run power is only 20% of rated power time =…

Q: What is the cost of running a 0.200-kW computer 6.00 h per day for 30.0 d if the cost of electricity…

A: The energy consumed in kWh is

Q: An electric motor with a 2 hp output drives a machine with an efficiency of 45%. What is the energy…

A:

Q: An engine does 7500 J of work in one minute. The power output of the engine is 125 flb/s 0.17 hp 6.0…

A: Work done,(W) by an engine=7500 J -----(1) [Given] Time taken,(t) by an engine=1 min=60 sec -----(2)…

Q: What is the kinetic energy of a 15 kg dog that is running at a speed of 7.0 m/s (about 16 mi/h)?

A: Given mass m = 15 kg speed v = 7.0 m/s  we have to find out kinetic energy

Q: A force of 35 N is needed to keep a 5.0 kg body moving at a constant speed of 7.5 m/s. What power is…

A: Given: The force on the body is 35 N. The mass of the body is 5.0 kg. The velocity of the body is…

Q: If the energy of a mosquito (10−2 g at 0.5 m/s) were used to supply the energy needs of the world,…

A: N = Eworld/ Emusquito

Q: One horsepower - hour is the work done in one hour by an agent working at the constant rate of one…

A: To determine: The definition for one horsepower hour.

Q: A 1400kg car accelerates from 11 m/s to 22 m/s. How much mechanical work was done on the car by the…

A:

Q: Output of a truck is 4500 J and its efficiency is 50%, input energy provided to truck is A. 5000 J…

A: Given data :- Output energy = 4500 J efficiency  η = 50 % = 1/2

Q: A winch is driven by a 4.0 kW electric motor and is lifting a load of 400 kg to a height of 5.0m. If…

A: Input power, P =  4 kW = 4000 W  mass, m = 400 kg  height, h = 5 m  time, t = 8.6 s   The power is…

Q: how much work is required to lift a 3.00kg object from a well 10.0 m deep?

A: The relation between work and displacement(height) is given by, W=Fd..............(1) where, F=force…

Q: What is the efficiency of a pulley system, which lifts a 1,000 kg load a distance of 2 m by the…

A: Given : Mass, m=1000 kg Distance, h=2m Force, F=150 kg for distance, d=15 m

Q: What is the kinetic energy of a 1066 kg car moving at 29.8m/s(66.7mi/h)?

A: Kinetic energy of an object is given by,                K.E = 12mv2     ----(1) where,    m - Mass…

Q: Force is defined as the speed at which work is performed. The unit of power is wet (W = 1 Js– 1).…

A: Write the given values with suitable variables. E=8000 kJt=24 hrs=86400 s Here, E and t are the…

Q: A worker does 100 J of work to move a box up an inclined plane. The amount of work useful  done is…

A: