10. It takes a force of 21,714 lb to compress a coil spring assembly on a New York City Transit Authority subway car from its free height of 8 in. to its fully compressed height of 5 inches. How much work does it take to compress the assembly the first half inch? the second half inch? Answer to the nearest in.-Ib.

Q: A bag of wheat weighs 4 kg. To what height should it be raised so that potential energy is 12 J?…

A: Given data,    Acceleration due to gravity  =  g    Potential energy  =  P.E    Mass of the bag  =…

Q: A force of 3.0 pounds is needed to stretch the spring to 1.0 ft. from its natural length of 10…

A:

Q: A weight lifter holds 900 N (about 200 lb) over his head. Is he doing work on the weights? Did he do…

A: While the weight lifter is holding the weight over his head, he is not doing any work, because there…

Q: 5. When a ball rises vertically to a height h and returns to its original point of projection, what…

A:

Q: A 75.0-kg painter climbs a ladder that is 2.95 m long and leans against a vertical wall. The ladder…

A: Given, Weight of painter = 75.0 kg Length of ladder = 2.95 m Angle = 30 degrees

Q: Does it take any work to push an object that does not move? Explain.

A: Work done is defined as product of displacement and force acting along displacement.

Q: The work done by a fielder when he takes a catch in a cricket match, is negative. Explain.

A: Write the expression for the work done.

Q: A particle of mass 6 kg is constrained to move along the trajectory y(x) = -8 x2 + 49 (m).  If the…

A:

Q: An electric motor is used to hoist building supplies from the ground to the roof of a buidling.

A: Given: Power output P = 1.5 kW time taken t = 12 sec   Concept: Power is define as the rate of doing…

Q: How much work did the movers do (horizontally) pushing a 46.0-kg crate 11.8 m across a smooth floor…

A:

Q: Calculate the work done in lifting a 300 N weight to a height of 10 m with an acceleration 0.5 ms.…

A:

Q: 30.0 m

A: Given:mass, m = 75 kg

Q: Is work done whenever a force is exerted? Explain.

A: Force F is applied to body to displace it from one position to another position, then work done on a…

Q: 28. How much work is done by the boy pulling his sister 30.0 m in a wagon as shown below? Assume no…

A:

Q: A construction worker, 20 feet up on a scaffold, lifts a 2-lb rope hand over hand up to the scaffold…

A: Given : Weight of Block=m=8 lb Weight of rope=M=2 lb Length of rope=l=20 feet Height of the…

Q: The force, ? required to compress a spring by a distance ? meters is given by ?=4? newtons. Find the…

A: Given Data : The force required to compress the spring is given as F = (4x)N The initial position of…

Q: It takes a force of 35 N to stretch a 45-cm spring to 90 cm and hold it there. How much work was…

A:

Q: 6. (II) Estimate the work you do to mow a lawn 10 m by 20 m with a 50-cm-wide mower. Assume you push…

A: The area of the lawn is A=l×b=10 m×20 m=200 m2 The corresponding area should be covered by moving 50…

Q: QUESTION 10 10. The force required to hold a spring 0.5 m past its natural length is 8 N. Find the…

A:

Q: When doing a chin-up, a physics student lifts her 42.0-kg body a distance of 0.25 meters in 2…

A: Mass of the physics student,

Q: 8. Find the work done on a lagage of 50 kg. pulled by a string elevated at 45 degrees by a force of…

A:

Q: 9. A sailor pulls a boat along a dock using a rope at an angle of 60.0° with the horizontal. How…

A: A sailor pulls a boat along a dock using a rope at an angle =60 Applied force F=225 Distance d=30.0…

Q: A one-dimensional variable force in the x-direction is given as F(x) = 2 x 1.61, where Fis in…

A:

Q: 2. A force of 3ON is required to maintain a spring stretched from its natural length of 12cm to a…

A: As per the guide lines first question is answered. Kindly post other as new post 2. The force…

Q: What is the minimum work needed to push a 900 -kg car 750 m up along a 8.5 ° incline? Ignore…

A: The expression for work done is, W=FdCosθ                 (I)…

Q: 3- How much power is required to raise a 30 kg crate a vertical distance of 6 m in a time of 4…

A: Mass , m = 60 kg distance , d = 6 m Time , t = 4 s Acceleration due to gravity , g = 9.8 m/s2 which…

Q: A mountain climber is about to haul up a 90-m length of hanging rope. How much work will it take if…

A: Given: The length of the hanging rope is 90 m. The weight of the rope is 0.65 N/m.

Q: 13. Which requires more work, carrying a 420-N knapsack up a 200 meter high hill or carrying a 210-N…

A: Given  two forces F1= 420N and F2 = 210N And two displacement d1= 200m and d2 = 400m So we have to…

Q: What will be the work, in Joule, done in stretching the spring through 40 mm if 10 N force is…

A:

Q: Bassam pushes a box 2.5 m by applying a 20N horizontal force. What work does he do? Select one: a.…

A: Required : Work done, W.

Q: 8. A 110-kg football player does a chin-up by pulling himself up by his arms an additional height of…

A: Given values: Mass, m=110 kg Height from the floor, h=50.0 cm Number of chin-ups, n=25 Acceleration…

Q: How much work is done in completing one rep of 50 kg on a bench press ( holding the bar, lowering…

A: Expression for work done -  W=F×S ..... (1)Where, W =Work done F =Applied force S =Displacement…

Q: 4. If the work required to stretch a spring 0.25?? beyond its natural length is 12 ?? − ??, how much…

A: We know that work required to be done to stretch a spring by x from it's natural length is given by…

Q: Calculate the work you must do to accelerate 2 kg from rest to 1 m/s. Answer in Joules.

A: Given: The mass of the object is 2 kg. The initial speed of the object is 0 m/s. The final speed of…

Q: Can the normal force on an object ever do work? Explain.

A: The work done on any object is given by W=Fd

Q: A 73 kg athlete runs up a flight of stairs in 5 s. His net upward displacement is 7 m. What average…

A: Write the given values with the suitable variables. m=73 kgt=5 sd=7 m Here, m is the mass, t is the…

Q: 1) How much work must one do to pull the block up 13 meters?  The mass is 44 kg.

A:

Q: A spring has a natural length of 12 cm. If a 30-N force is required to keep it stretched to a length…

A:

Q: During a fitness test for the US marines, Jacob and Janelle ran up a hill. Jack is 1.5 times as…

A: Let Mass of janelle be m. Given mass of jack=1.5×m( mass of janelle) Let time taken by jack be t.…

Q: A men of mass Yong climbs up the stairs & reaches the roof at a height 8m in 5 sec- find:- men ii)…

A: Given: The mass of the man is 40 kg. The height climbed by the man is 8 m. The time interval is 5 s.

Q: 8.1. What is the work done by a force of 20 N acting through a parallel distance of 8 m? What force…

A: The work done by a force is   W=Fd      =(20 N)(8 m)=160 J

Q: 11The longest shish kebab ever made was 881 m long. Suppose the meat and vegetables need to be…

A: The net work done on the cart and its content during the delivery is Wnet=Fappdcosθ-Ffd=(40.00…

Q: QUESTION 7 is the ability to do work.

A: