If a blow dryer uses 1.1 x 10³ J of energy, and it is in use for 15 minutes, what is its power? the answer is... a. 990 W b. 1.2 W c. 4400 W d. 18 000 W e. 980 W

Q: In the figure here, amal k is sent the point Awith apd of 4 w e gh where he 50m and 30m What is the…

A: Using the conservation of energy for points A and C,…

Q: How long would it take a  2.5*10^5 airplane with engines that produce  135MW of power to reach a…

A: Given,

Q: As Chinook salmon swim upstream in theYukon River to spawn, they must travel about 3000 km in…

A:

Q: A pump is required to lift 800 kg (about 200 gallons) of water per minute from a well 10 meters deep…

A: Power= (force× distance)/time P = mgh/t 1HP = 745.7 watt Potential energy = mgh Where, m = mass h =…

Q: (II) A ski area claims that its lifts can move 47,000 people per hour. If the average lift carries…

A:

Q: A certain rain cloud at an altitude of 2.10 km contains 3.20 107 kg of water vapor. How long would…

A:

Q: A water pump pumps out 2040kg of water per minute. (A) if water is coming out with a velocity of 3…

A: mass of water pumped per minute = 2040 kg mass of water pumped per second = 2040/60 = 34 kg

Q: A person in good physical condition can put out 100 W of useful power for several hours at a…

A:

Q: Q2(Hw) In two Wattmeter method, iff W-120.6W W2%=220,5W, Calculate the load p.f.

A: The phase angle (lag) in two wattmeter method is given by :  Putting values :

Q: A person in good physical condition can put out 100 W of useful power for several hours at a…

A: power of each person = 100 Wefficiency = 100 %

Q: 3. A car of mass 1500kg is accelerated from rest to a) What is the final kinetic energy of the ca b)…

A:

Q: Before the invention of the electric refrigerator in 1913, people kepi neir food cool with blocks of…

A: work done = Fx potential energy = - work done by conservative force

Q: One Watt = ? A) 1 Joule/sec B) 1 erg/sec C) 1 Pascal/sec D) 1 m/s

A:

Q: A box of mass 20kg is raised to a height of 30m? a. How much work is done on the box? b. If it…

A:

Q: An automobile having a mass of 1250 kg is traveling at 40 m s¯1. What is its kinetic energy in kJ?…

A: Given Kinetic energy can be determined as

Q: A person in good physical condition can put out 100 W of useful power for several hours at a…

A: (a) Consider the output of one person be Wp, and the power of the electric clothes dryer be We. The…

Q: 59. a. Find the amount of work done in lifting a 50-lb weight upward 5 ft. b. If 200 N of force is…

A: a. the amount of work done is W=Fd=50 lb5 ft=250 lb-ft

Q: A student who weighs 569N climbs a stairway (vertical height of 4.3 m) in 26 s. (a) How much work is…

A:

Q: How much work done in k J( kilo joule) can a 3 hp (horsepower) motor do in 1 hour? (Write the full…

A: Power is the amount of force per unit velocity Power=force×velocity P=Force×distancetimeP×time=work…

Q: ry from the floor onto a shelf 1.9 2) a) How much work Gin Joules) is done in lifting a 2.5 kg…

A:

Q: A man of mass 80 kg runs up a flight of stairs 20 m high in 10 s. (a) how much power is used to lift…

A: Given: Mass of the man m = 80 kg Height of the stairs = 20m Time taken t = 10 seconds

Q: Q1/ Derive the power (watt) into its tlhe basic S.I mits?

A: Power = workdone/time

Q: A certain handcrank generates power at 75W. How long will it need to be run to fully charge a…

A: Power: The energy per unit time is known as power. Power = Energy/time

Q: 10. A machine is used to move a 700 N object by 2.00 m by exerting 400 N of force through a distance…

A:

Q: tia 10 kg m² Vigt is the required average power? g at 50 rad/s. It must be brought to stop in 10 s.…

A: Work done on a body is equal to the increase in the energy of the body, for work transfers energy to…

Q: If a boat and its riders have a mass of 900 kg and the boat drifts in at 1.4 m/s how much work does…

A:

Q: A heavy rope, 50 ft long, weighs 0.9 lb/ft and hangs over the edge of a building 140 ft high. a. How…

A: Given: Length of rope (l) = 50 ft. Weight of rope (w) = 0.9 lb/ft. Height of building (h) = 140 ft.

Q: A student who weighs 547 N climbs a stairway (vertical height of 2.9 m) in 21 s. (a) How much work…

A: weight = mg  = 547 N Height = 2.9 m time (t) = 21 seconds   A) Work done = change in potential…

Q: A pump is required to lift 800 kg (about 200 gallons) of water per minute from a well 10 m deep and…

A: Given: Mass m=800 kg Depth h=10 m Speed v=20 m/s Time  t=1 min Standard conversion used: 1…

Q: (I) A 75.0-kg firefighter climbs a flight of stairs 28.0 m high.How much work does he do?

A:

Q: An electric motor is rated to have a maximum power output of 0.67 hp. If this motor is being used to…

A:

Q: A 9.55 kg object is initially traveling at 24.8 m/s. During the next 185 seconds – 263 J of total…

A: According to the work energy theorem,

Q: 20. A small electric motor is used to raise a weight of 2.0 N through a vertical height of 80 cm in…

A: Given : W = 2.0 N h = 80 cm = 0.80 m t = 4 s e = 20% = 0.20

Q: A 1.0 kg box is moving with a velocity of 36.0 km/h. If 150 J of work is done on the box, what is…

A:

Q: A 1500kg car is travelling with an initial velocity of 30.0 km/h while traveling through a school…

A: This question is based on Work Power and Energy topic. Power formula: Efficiency formula:

Q: A certain rain cloud at an altitude of 2.10 km contains 3.20 x 10 kq of water vapor. How long would…

A: Given values:Mass of the water vapor, m = 3.20 x 107 kgHeight of water be raises, H = 2.10 km = 2.10…

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

A:

Q: Four light bulbs, rated at 100 W, 75 W, 50 W and 25 W each, are in parallel. What is the total power…

A:

Q: How much power does it require to raise a car with mass of 1890kg at the rate of 45 meter per…

A: Given data :  Mass of car 'm'= 1890kg . velocity of car "v" = 45 m/s . To find power or energy of…

Q: (I) (a) Show that one British horsepower(550 lb/s) is equal to 746 W. (b) What is the horsepower…

A:

Q: |F] B A Compute the work done by the 98 N in moving the block from position A to position B in above…

A:

Q: A body does 25.J of work in a seconds. what is its Power I

A:

Q: A person in good physical condition can put out 100 W of useful power for several hours at a…

A:

Q: The power of a small motor in a toy can be calculated by the amount of work it does in a period of…

A:

Q: An automobile having a mass of 1250 kg is traveling at 40 m·s−1. What is its kinetic energy in kJ?…

A: To find the kinetic energy of the automobile and required amount of work to halt it.We are given…

Q: A 100 g apple falls fom a tree fom a height of 2.8 m and reaches the ground at a speed of 5 m/s…

A:

Q: How much work would have to be done to bring a 970-kg automobile traveling at 72 km/h to a stop?__ J

A: Consider an automobile having mass m moving with initial speed vi.

Instantaneous Power

Power is defined in physics as the amount of energy transmitted or transformed per unit time. The watt is the unit of electricity in the International System of Units, equivalent to one joule per second.