A 1,000-W motor powers a hoist used to lift cars at a service station. (a) How much time would it take to raise a 2,150-kg car 3 m? (b) If the original motor is replaced with one rated at 3,000 W, how long would it take to complete this task?

Q: A man pushes a lawn mower on a level lawn with a force of 213 N. If 53% of this force is directed…

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Q: A 1000 Kg truck has a power output of 40. 0 kilo watts. Find the time (seconds) needed to accelerate…

A: Mass of truck, M=1000kg Mass of load, m=100kg Initial speed of truck, u=40m/s Final speed of truck,…

Q: If a 1300 kg car can accelerate from 30 km/h to 60 km/h in 3.9 s , how long will it take to…

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Q: When its 80 kW engine is generating full power, a small single-engine airplane with mass 750 kg…

A: Given data:  Full power of engine (Pfull) = 80 kW Mass (m) = 750 kg Speed (v) = 2.5 m/s Required:…

Q: An electric motor is rated to have a maximum power output of 0.83 hp. If this motor is being used to…

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Q: Determine the amount of work, in Joules, done to lift a 500 kilogram piano 4 meters above the…

A: Mass of paino(m) = 500 kgHeight above ground (h) = 4mLinear mass density of cable = 5 kg/mLength of…

Q: How much power does it take to lift a 49kg person a 5m vertical distance in 20s?

A: Given: mass, m = 49 kg  height, h = 5 m  time, t = 20 s

Q: average power delivered

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Q: An electric motor raises an elevator weighing 1.20 x N a distance of 9 m in 15 s. What is the power…

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Q: A crane lifts a 320 kg crate up a height of 4.5 m. The crane has a power rating of 2000 W. How much…

A: Given data The mass of the crate is given as m = 320 kg. The height up to which the crate lifts is…

Q: What is the shortest possible time for a forklift with a 2¾ horsepower lifting motor to raise a…

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Q: Motor-driven cable lifts a skier of 78 kg up a slope. (a) At a constant speed of 3.1 m/s, how much…

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Q: A car could accelerate from rest to 60 mi/hr (27 m/sec) using a 302 V8 in a time of 1.2 sec.  If the…

A: solution

Q: How long will it take a 742-kg car with a useful power output of 43.2 hp (1 hp equals 746 W) to…

A: Mass of car (M) = 742 kg  Output power of car = 43.2 hp  Power (P) = 43.2(746W) = 32227.2 W  Speed…

Q: A 40-foot rope with a linear density of 0.1 pounds per foot is hanging from the edge of a balcony. A…

A: Given:        e=0.1 pounds per foot         L=40ft        w=20lb

Q: How much power will a 260 N student develop if he/she climbs a flight of stairs 12 m from the ground…

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Q: You are an athlete who masses 80 kg. When doing a pushup you lift a total of about 56 kg a distance…

A: The gravitational force is, F=mg Here, F is the force, m is the mass and g is the acceleration due…

Q: How long will it take a 921-kg car with a useful power output of 57.6 hp (1 hp equals 746 W) to…

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Q: An electric motor with an efficiency of 85% drives an elevator that raises 10 tons at a height of 85…

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

A: Given data:  Weight (mg) = 400 N Height (h) = 2.20 m Time (t) = 1.60 s Required: The output power in…

Q: A 500-kg dragster accelerates from rest to a final speed of 110 m/s in 400 m (about a quarter of a…

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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: A race car travelling on a straight and flat stretch of track must overcome 1.5 kN of resistance to…

A: Given : F = 1.5 kN = 1.5 x 103 N v = 190 km/hr = 190 x 1000/3600 = 52.78 m/s

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

A: We know that one people produces an output of 100 W so the number of people that can produce 5 kW of…

Q: Consider a space colonist on a far off planet. They are trying to lift a box tied to a rope from the…

A: Let the weight of the box = w Let the height of first floor window from ground = h Let the…

Q: How long will it take a 751-kg car with a useful power output of 57.5 hp (1 hp equals 746 W) to…

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Q: (a) How long would it take a 1.50×105 -kg airplane with engines that produce 100 MW of power to…

A: Given: Mass of airplane M = 1.5×105 kg Power produced by engine P = 100 MW Final speed of airplane v…

Q: An elevator has a rated capacity of 1000 kg. It can transport people at the rated capacity between…

A: Given data m=1000 kgd=5 mt=7 sec

Q: If a ski lift raises 100 passengers averaging 660 N in weight to a height of 150 m in 60.0 s, at…

A: Given information: Here, mg is the average weight of the passenger, h is the height attained by the…

Q: If a 1300 kg car can accelerate from 30 km/h to 60 km/h in 3.9 s , how long will it take to…

A: Mass of car, m = 1300 kg Velocities are,  v1 = 30 km/h = 30*(1000m/3600s) => v1 = 8.33 m/s v2 =…

Q: A child pulls on a wagon with a force of 67 N. If the wagon moves a total of 45m in 188 s, what is…

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Q: A 1,000-W motor powers a hoist used to lift cars at a service station. (a) How much time would it…

A:

Q: A shooting star is the trail of a meteor - a chunk of debris hurtling through Earth’s atmosphere. As…

A: Energy = (1/2)m(v)2 E = (1/2)(0.002)(100000 * 1609.4/3600)2 E = 1998586.7 Joules Work done =…

Q: How much work is done by a person lifting a 4.1 kg object from the bottom of a well at a contact…

A: Given Data: The mass of an object is, m=4.1 kg The contact speed is, v=2.2 m/s The time required for…

Q: An electric motor is rated to have a maximum power output of 0.79 hp. If this motor is being used to…

A:

Q: An electric hoist working at 65% efficiency lifts 255 kg to a height of 6.5 m drawing 1470 W of…

A: Efficiency e = 65  M = 255 kg  H = 6.5 m  P = 1470 w