A champion athlete can produce one horsepower (746 W) for a short period of time. If a 70-kg athlete were to bicycle from the bottom to the top of a 254-m high mountain while expending power at the rate of 532 Watts, she would take at least how many seconds to reach the top.

Q: As part of a charity fund raising drive, a runner with mass 50.0 kg runs up the stairs to the top of…

A: Mass of the runner=50kgHeight=443macceleartion due gravity=g=9.8m/s2Increase in potential…

Q: How much power is needed to uniformly accelerate a 1000-kg test car from 30 kph to 70 kph as it…

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Q: An elevator must lift 15,000 kg a distance of 125 m at a velocity of 2.5 m/s. What is the average…

A: Mass, m = 15000 kg Distance, d = 125 m  Velocity, v = 2.5 m/s Acceleration due to gravity, g = 9.81…

Q: A 1,505 kg car starts at rest and speeds up to 4.2 m/s with a constant acceleration. If the car…

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Q: A student weighing 551 N climbs at constant speed to the top of an 14 m vertical rope in 17 s. What…

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Q: Brick load. A load of bricks with mass m = 363 kg is to be lifted by a winch to a stationary…

A:

Q: A circular coil 12.0 cm in diameter and containing nine loops lies flat on the ground. The Earth's…

A:

Q: omputation. QO A 10-kg block is pushed a distance d up an inclined plane by a horizontal force of…

A: Calculate the work done by the gravity force on the block.  Acceleration due to gravity is, g = 9.81…

Q: A car of wheat weight 700 kg.To what height should it be raised so that potential energy is 8860 J?…

A: Given data:  Mass of car (m) = 700 kg Potential energy (PE) = 8860 J Acceleration due to gravity (g)…

Q: A roller coaster car tops the highest point of the ride at 2 metres per second. The highest point of…

A:

Q: A 618-kg elevator starts from rest and moves upward for 3.10 s with constant acceleration until it…

A: Given Data: The mass of an elevator is, m=618 kg The time required to move upward is, t=3.10 s The…

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: A 1000 kg car is initially travelling at 26ms26ms along a horizontal road when the driver hits the…

A: The car is having a deceleration. The equation of motion is given by, v=u-at Here, v is the final…

Q: The car weighing 1.0 × 10³ kg has an engine with a power of 80 kW. What is the biggest acceleration…

A:

Q: A bag of wheat weight 330 kg .To what height should it be raised so that potential energy is 7800J?…

A: Given data:  Mass (m) = 330 kg Potential Energy (PE) = 7800 J g = 9.8 m/s2 Required: Height (h)

Q: what is the power required for a 55 kg student to run up a set of stairs that has a height of 20 m…

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Q: Question 9. The cheetah is one of the fastest accelerating animals, for it can go from rest to 9.4…

A:

Q: A 125-lb student races up stairs with a vertical height of 4.0 m in 5.0 s to get to a class on the…

A: The force due to gravity is, F=mg=125 lb1 kg2.2 lb9.8 m/s2=556.8 N The work done by the force is,…

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

A:

Q: A child pulls on a wagon with a force of 75 N. If the wagon moves a total of 30 m in 2.0 min, what…

A: Given , Force = 75 N Displacement s = 30 m Time = 2 minutes

Q: A 684-kg elevator starts from rest and moves upward for 4.20 s with constant acceleration until it…

A: Given: The mass of the elevator is m=684 kg, The cruising speed is vf=1.79 m/s. The time is t=4.20…

Q: A 56.5-kg person is running and accelerates from 3.67 m/s to 8.29 m/s in 5.67 s. How much power does…

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

A: Given: Mass of system, (combined mass of platform and the crate), M = 300 kg Height upto which it is…

Q: A car climbing up a hill at constant speed of X m/s. Given the car is going up a slope of 5 degree…

A: The mass of the car, The inclination of the plane, The power of the engine, The frictional force,

Q: A 694-kg elevator starts from rest and moves upward for 2.80 s with constant acceleration until it…

A: Data Given , Mass of the elevator ( m ) = 694 kg Elevator starts from rest , means  Initial velocity…

Q: A cowboy shoots a pistol in the air when he rides a horse into a small town. The muzzle speed is…

A:

Q: A 55.5 kg man walks up a set of stairs in 10.2 s. The man rises 4.5 m in going up the stairs. What…

A: Given Data Mass of man, m = 55.5 kg height, h = 4.5 m Time taken, t = 10.2 s Average power (in…

Q: Without pedaling, the rider rides down a 3.0% slope with constant speed of 7.0 m/s. With how much…

A: Slope = 3% therefore, θ = Tan-1(0.03) = 1.718oV = 7 msmass (m) = 80 kg

Q: An advertisement claims that a(n) 1600 kg car can accelerate from rest to 26 m/s in 8.4 s. Given:…

A: Given Mass of the car is given as m=1600 kg Initial speed of the car is vi=0 Final speed of the car…

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

A:

Q: A 607-kg elevator starts from rest and moves upward for 3.90 s with constant acceleration until it…

A: Solution: given that m = 607 kg t = 3.9 s v = 1.67 m/s

Q: A 1000kg car moving at 22.8 m/s on a flat road slams on the brakes and skids to a stop. The…

A: Mass of the car (m) = 1000 kgInitial velocity (v) = 22.8 m/sCoefficient of kinetic friction () =…

Q: Gravel is lifted from the ground to the top of a building 60 feet high by a 20 Hp engine.How many…

A: Power of engine = 20 Hp using 1 Hp = 746 Watts Therefore, power of engine = 20 * 746  = 14920 Watts…

Q: A 129 pound student races up stairs with a vertical height of 5.7 m in 6.5s to get to a class on the…

A: Given data The weight of the student is W = 129 lb. The vertical height is given as h = 5.7 m The…

Q: A horizontal spring is stretched 10 cm and then released from rest. Will the spring ever stretch a…

A: Given that: The spring was stretched 10 cm initially and released from rest.