(II) In a certain library the first shelf is 15.0 cm off the ground,and the remaining four shelves are each spaced 38.0 cmabove the previous one. If the average book has a mass of1.40 kg with a height of 22.0 cm, and an average shelf holds28 books (standing vertically), how much work is requiredto fill all the shelves, assuming the books are all laying flaton the floor to start?

Q: A shopper in a supermarket pushes a trolley with a force of 40N directed at an angle of 35° downward…

A: Work-done by a force F over displacement 'd' is given by: W = F.d W = F*d*cos theta Given that: F =…

Q: a block with mass m=20 kg pulled on horizontal surface , bulled by external force by 1000 N as shown…

A: Frictional force=μmg where μ=coefficient of friction m=mass of body Work done by force=F.X where…

Q: You raise a bucket of water from the bottom of a deep well. If yourpower output is 108 W, and the…

A:

Q: A labourer weighing 600 N is to carry 5 sacks of rice from ground floor to the second floor of the…

A: Given  Weight of labour, W = 600 N  No of sack, N = 5  Mass of each sack ,M = 50 kg  Distance…

Q: A 2.0 kg box is raised from rest a distance of 5.0 m by a vertical force of 130 N. Find the work…

A: Given data:  Mass (m) = 2.0 kg Height (h) = 5.0 m Force (F) = 130 N Required: Work done (W)

Q: How long will it take an 850-kg car with a useful power output of 40.0 hp (1 hp equals 746 W) to…

A: Use work energy theorem

Q: Why do we say that the work done by coolie carrying a suitcase along a horizontal road is zero?

A: When a coolie lifts the luggage, he applies the force in the upward direction, which is against…

Q: A spring has a natural length of 15 inches. A force of 10 lbs. is required to keep it stretched 5…

A:

Q: A ball of mass 0.320 kg is thrown upward, rising 12.1 m above the point at which it was released.…

A:

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: is pushed 4.O m along hori zontal floor by A 2 kg block a force of magnitude 25N at angle Q = 30.0°…

A:

Q: A worker pushes horizontally on a large crate with a force of 250 N, and the crate is moved 3.0 m.…

A: Given that the force applied by the worker on the crate is F =250 N. The distance moved by the crate…

Q: How long will it take an 850-kg car with a useful power output of 40.0 hp (1 hp equals 746 W) to…

A: Given data: The mass of the car is, m= 850 kg The useful output power is, P=40 hp=29840 Watt The…

Q: The work done on an object moving parallel to the force acting on it is: O OJ O at maximum O…

A:

Q: A 50lb is lifted, at a constant rate, to a height of 10 feetfrom the ground. Compute the work…

A:

Q: A box weighing (10O Ib) is pushed (20 ft) along a level floor at constant velocity by a horizontal…

A: Given- Weigh of box m=100 lb Distance d=20 ft The coefficient of sliding friction between the box…

Q: Can the power expended by a force be negative?

A: The rate of doing work is known as power.

Q: A spring of spring constant 5 x 10 N/m is stretched initially by 5cm from the unstretched position.…

A:

Q: A ball of mass 0.270 kg is thrown upward, rising 11.1 m above the point at which it was released.…

A: Given:

Q: Suppose the car approches a hill and has the intial speed 106 km/h at the bottom of the hill. The…

A: Given Data : The initial speed of the car at the bottom of the hill is given as u=106 ms

Q: In the question given as follows, determine the work done by the constant force :-   The locomotive…

A: Given,  massm=7 tons=7000 kg displacement (d)=0.25 mile=402.336 m

Q: If it takes 6.00 J of work to stretch a Hooke's-law spring 15.0 cm from its unstressed length,…

A: Given Data: Work Done to stretch spring from unstressed length to 15 cm = 6 Joule We have to find…

Q: ure shown, if the mass (m=8 Kg) is moving with constant speed and traveled a distance d=15 m, what…

A: Given that Block is moving at constant speed, So that means acceleration of block in horizontal…

Q: Assume it takes 10 J to stretch a spring 10 cm beyond its natural length. Find the work required (in…

A: Solution:Given: work done=10JStrecth in spring x =10cm =0.1msince we know that dW= F.dx

Q: If 2.0 J of work is done in raising a 0.180 kg apple, how far is it lifted? (Remember: F = mg)

A: Given  Work done W=2J Mass of apple m=0.18kJ

Q: When a punter kicks a football, is he doing any work on theball while the toe of his foot is in…

A: The punter can only be applying a force when he is in contact with the football. Therefore the…

Q: - A moving object whose initial KE is 10 J is subject to a frictional force of 2 N that acts in the…

A: Given data:  Initial kinetic energy (KEi) = 10 J Final kinetic energy (KEf) = 0 J Force (F) = 2 N…

Q: An electric motor driven conveyor belt is required to take 2,200 pounds of dirt, rocks, etc. per…

A: A conveyor belt takes 2200 pounds per minute and raises it by 15ft.  2200 pounds (m) = 997.9 kg…

Q: Camplng eipneut weighing 6000N is polled ro n lale t means of a horiatal 2ope The coefficient of…

A: The mass of the equipment can be written as m=Wgm=6000 N9.8 m/s2m=612.2 kg…

Q: When a driver applies the brakes to keep a car going downhill at constant speed and constant kinetic…

A:

Q: How high a hill can a car coast up (engine disengaged) if work done by friction is negligible and…

A: Using the conservation of energy, the kinetic energy of the car at the lowest point equals the…

Q: A 380-kg piano slic from accelerating E llel to the incline (F ted by the man, - done by the man o…

A: We know tha the we have given that the mass of the piano is m and it slide from d =  3.9 m down with…

Q: Calculate the work done (in J) on a 1550 kg elevator car by its cable to lift it 37.5 m at a…

A:

Q: A shopper in a supermarket pushes a trolley with a force of 40N directed at an angle of 35° downward…

A:

Q: oblem 8.6 As shown in Fig. 8.21, consider a 15 kg block being shed up the rough incline by a…

A: Work done = FS Cosθ

Q: A shopper in a supermarket pushes a trolley with a force of 40N directed at an angle of 35° downward…

A:

Q: Calculate the work done in pushing a 40 kg crate 12 m across a level floor if the cofficent of…

A: Mass, m=40 kg Distance to be pushed, d=12 m Coefficient of friction = 0.4

Q: Calculate the work done in lifting a 500N barbell 2.2m above the floor?

A: Given:Weight of the barball = 500 NDisplacement of the barbell = 2.2 m upward

Q: 2.5 F est across a floor at the rate of 2.01m/s- for 8.5s. Find the net work done on the box.

A: Work done = Force × Displacement  If force and displacement are in same direction

Q: When a conservative force does positive work on a body, the potential energy ofthe body…

A: Decreases

Q: Find out the work done when a force done of 20N displaces a body through 8m in the direction of the…

A: Write the expression for the work done.

Q: 6.35 Just before striking the ground, a 2.0-kg mass has 400 J of KE. If friction can be ignored,…

A: