A person in good physical condition can put out 100 W of useful power for several hours at a stretch, perhaps by pedaling a mechanism that drives an electric generator. Neglecting any problems of generator efficiency and practical considerations such as resting time: (a) How many people would it take to run a 2.00 kW electric clothes dryer? b) How many people would it take to replace a large electric power plant that generates 700 MW

Q: On an essentially frictionless, horizontal ice rink, a skater moving at 6.0 m/sm/s encounters a…

A: Given initial speed= 6m/s Final speed = 2.88m/s Friction force = 0.22Mg = 2.2M Change in kinetic…

Q: Promotional material for the 2020 C8 Chevrolet Corvette boasts a ''490 hp engine" and a "zero to 60…

A: Given data: Initial speed of the car, u=0 Final speed, v=60 mph = 26.82 m/s Mass of the car,…

Q: A power specification formula is to be derived for electric motors which drive conveyor belts moving…

A: The mass flow rate (m) can be converted to its value (say m1) in the SI unit (kg/s) as follows:

Q: A transport truck driving at a constant speed of 83.7 km/hr on a flat stretch of highway must…

A: Given,  Speed of truck, v = 83.7 km/h Force required to overcome friction, F = 2,893 N Power…

Q: A 520-kg dragster accelerates from rest to a final speed of 105 m/s in 390 m, during which it…

A:

Q: A 10 kg mass is released from rest from the top of a 2 m long ramp, inclined at 30°. The speed of…

A: 7) work done by the friction = final kinetic energy - initial potential energy W = (1/2)(10)(2)2 -…

Q: A toy train accelerates from rest to 0.62 m / s in 21 ms. If the mass of the train is 875 g, what is…

A: ACCELERATION  OF TARIN a = 0.062 / 21 X 10-3 m / s2 = 2.95 m/ s2 mass = 0.857 kg v= 0.62 m/s power =…

Q: A 450 kg dragster accelerates from rest to a final speed of 120 m/s in 400 m (about a quarter of a…

A: mass of dragster = 450 kg Initial velocity = 0 m/s final velocity = 120 m/s distance moved = 400 m…

Q: When its engine of power 76 kWkW is generating full power, a small single-engine airplane with mass…

A: Given:               Engine Power , P = 76 kW = 76×103W                                mass  M= 710…

Q: A cheetah can accelerate from rest to 6.4 m/s (about 16 m/h) in 1.2 seconds. How much average power…

A:

Q: Football players measure their acceleration by seeing how fast they can sprint 40 yards (37 m). A…

A:

Q: A tower crane has a hoist motor rated at  167 hp. If the crane is limited to using  65.0 % of its…

A: A tower crane has a hoist motor rated at  167 hp. If the crane is limited to using  65.0 % of its…

Q: A skier of mass 62 kg is pulled up a slope by a motor-driven cable. (a) How much work is required to…

A: mass of skier (m) = 62 kg distance pulled (d) = 50 m Angle of incline (θ) = 30oConstant speed (v) =…

Q: What average power is needed to lift a 65-kg vendor vertically upward at a uniform speed of 0.44…

A:

Q: I have a motor that is rated for 6000 W. What is the maximum amount of work that the motor can do in…

A: Given data The power of the motor is P = 6000 W The time taken to work is t = 10 s The mass of the…

Q: If a car generates 17.3 hp when traveling at a steady 81.3 km/hr, what must be the average force…

A:

Q: A transport truck driving at a constant speed of 83.3 km/hr on a flat stretch of highway must…

A:

Q: Using energy considerations, calculate the distance the 65.0-kg baseball player slides,given that…

A: The initial kinetic energy of the system is

Q: At an amusement park, a swimmer uses a water slide to enter the main pool. If the swimmer starts at…

A: The law of energy conservation,

Q: How much time is required for a elevator to lift a 2000 kg load up 28 m from the ground level, if…

A: Given data: Mass m = 2000 kg Distance from ground level d = 28 m Power P = 13 kW

Q: A skier of mass 61 kg is pulled up a slope by a motor-driven cable. (a) How much work is required to…

A: Given:Mass = 61 kgDistance to be covered = 55 mAngle = 30oSpeed = 2.1 m/s

Q: A loaded elevator has a total mass of 28 kg and is lighted to a height of 200 m in a time of 45s.…

A:

Q: Starting from rest, a 60.0 kg student takes 4.0 s to run up a 3.0 m high flight of stairs. On…

A:

Q: An accelerating object of mass m=5 kg is fired with an initial speed v;=9 m/s at a starting point.…

A:

Q: An engine develops 10 kW of power. How much time will it take to lift a mass of 200 kg to a height…

A: Given data :- Power P = 10 kW = 10 × 1000 W = 10000 W mass m = 200 kg height h = 40 m g = 10 ms-2

Q: Grains from a hopper falls at a rate of 22.1 kg/s vertically onto a conveyor belt that is moving…

A: Given: dmdt = 22.1 kg/sv =4.75 m/s

Q: I need help with this homework problem.

A: Given Mass of the elevator m = 3.0 x 103 kg Distance travelled y = 245 m Duration t = 19 s

Q: An accelerating object of mass m=20 kg is fired with an initial speed v;=7 m/s at a starting point.…

A:

Q: A warehouse worker uses a forklift to lift a crate of pickles on a platform to a height 3.75 m above…

A:

Q: A skier of mass 71 kg is pulled up a slope by a motor-driven cable. (a) How much work is required…

A:

Q: A truck weighing 3.0 x 10^4 newtons was driven up a hill that is 1.6 x 10^3 meters long to anarea…

A: Weight of the truck  W = 3×104 N The weight is a measure of the force of gravity acting on the…

Q: What minimum horsepower must a motor have to be able to drag a 380 kg box along a level floor at a…

A: The frictional force acting between box and floor is, F=μmg             (I)…

Q: The aircraft carrier USS George Washington has mass 1.0 ×108kg. When its engines are developing…

A: Let Pout be the total power output of the engines, P is the power used to push the ship through the…

Q: When its 75-kW (100-hp) engine is generating full power, a small single engine airplane with mass…

A:

Q: What average mechanical power (in W) must a 70.5 kg mountain climber generate to climb to the summit…

A: Write the given values with suitable variables. m=70.5 kgh=305 mt=47 min=47×60 s=2820 s Here, m, h,…

Q: A hydroelectric generator converts kinetic energy of water into electrical energy. Each second 2264…

A: Given: The mass of the water is m =2264 m3 The height of the waterfall is h=191 m’ Acceleration due…

Q: What average mechanical power (in W) must a 60.0 kg mountain climber generate to climb to the summit…

A: solution as

Q: A 700 kg dragster accelerates from rest to a final speed of 120 m/s in 400 m (about a quarter of a…

A:

Q: What average mechanical power (in W) must a 70.5 kg mountain climber generate to climb to the summit…

A: The expression for the average mechanical power (P) is,

Q: When an automobile moves with constant speed down a highway,most of the power developed by the…

A: Power and speed is related by,

Q: A skier of mass 77 kg is pulled up a slope by a motor-driven cable. (a) How much work is required to…

A:

Q: A woman uses a pulley and a rope to raise a 20 kg weight to a height of 2 m. If it takes 4 s to do…

A: mass, m = 20 kg  height, h = 2 m  time, t = 4s  The formula for energy is  E = m g h  The power is…

Q: Calculate the power output needed for a 952-kg car to climb a 2.00° slope at a constant 33 m/s while…

A: