Say I lift a box from the ground straight up to 1m in 2s. If I lift the same box from the ground but except this time, I do it diagonally in 2s. Why do I feel more tired when the same amount of work (and same power used) is done on the box?

Q: A bag of wheat weight 2300 kg .To what height should it be raised so that potential energy is 7890J?…

A:

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 fast must be the 4.0 kg basketball thrown upward to achieve the same potential energy of 160 J?

A: Given: The mass of the object is 4 kg. The potential energy of the object is 160 J.

Q: A force of 2 pounds is required to hold a spring stretched 0.3 feet beyond its natural length. How…

A: calculation

Q: A boy carrying a bag on his shoulders walking at angle of 90 degrees does any work or not?

A: Given : A boy carrying a bag on his shoulders walking at an angle of 90 degrees. We know that the…

Q: Is it possible to increase the kinetic energy without the application of external force?

A: yes the kinetic energy will increase without applying any external force. for example, when we kept…

Q: If a .770 kg ball is tied to a 1.5m string and swung in a vertical circle, what is the work done by…

A: Given:mass of ball (m) = 0.77 kg. length of string (l) = 1.5 m. displacement by string = 2l = 3 m.

Q: - A weight-lifter does 4.4 x 10³ J of work in raising a weight from the floor to a height of 2.0…

A: Given  Work (w) = 4.4 × 103 J  Height (h) = 2 m  (a) let average force is ' F ' .   w = F× h…

Q: A force of 77 pounds is required to hold a spring stretched 0.3 feet beyond its natural length. How…

A:

Q: A force of 7 pounds is required to hold a spring stretched 0.5 feet beyond its natural length. How…

A:

Q: Ahmed carrying a weight of 50 N walks a distance of 2m as shown in figure. The work done by him is…

A:

Q: A ball of 0.1 kg is dropped from rest. When it falls through a distance of 2 m, the work done by the…

A: The expression for work done is, W=F×d                                    F=force,d=dispalcement…

Q: A 700-kg car accelerates uniformly from 3 m/s to 10 m/s. The work done on the car (in kJ) is: Оа.…

A:

Q: A force of 4 pounds is required to hold a spring stretched 0.3feet beyond its natural length. How…

A:

Q: If your friend pushes a lawnmower 4 times as far as you do while exerting only half the force, which…

A: The work is force times distance. Your friend uses a half of the force but goes four times as far.…

Q: Why is it tiring to push hard against a solid wall even if no work is done? A 75 kg firefighter…

A: Q 1) We get tired because we use our energy to contract the muscles. We try to push the wall using…

Q: A 5.0-kg cart is moving horizontally at 4.0 m/s. In order to change its speed to 6.0 m/s, the net…

A: Given: Mass of cart m=5.0 kg Initial speed u=4.0 m/s Final speed v=6.0 m/s To find net work done in…

Q: A 1400 kg car accelerates from 5 m/s to 10 m/s. The net work done by the car is V2 500 J 200 J 300…

A: Given, Mass of car m = 1400 Kg Initial velocity of  the car u = 5 m/s Finial velocity of the car v =…

Q: What would be the power output in hp of a 1750 kg car if it can ascend to the top of a 285 m high…

A: Take the bottom of the hill to be at height zero. The potential energy of the car at the bottom of…

Q: How much work is done by a table as it holds up a 3.8 kg cat? Your answer: O OJ 3.8 J 37 J The…

A: The work done to hold up a cat on the table is the potential energy due to the gravitational force.…

Q: What is the average power must produce to accelerate car with 1500 kg from rest to the speed 30…

A:

Q: In a "pop fly a 1.5 x 10^2 g baseball is projected vertically upward with an initial kinetic energy…

A:

Q: A bird of mass m = 2kg flies at a height h = 10 m from the ground with a constant horizontal speed v…

A: The mass of the bird, m=2 kg   The height, h=10 m   The horizontal speed, v=10 m/s

Q: A record was set for stair climbing when a man ran up the 2300 steps of the Empire State Building in…

A: Average power output is,

Q: A force of 1 pounds is required to hold a spring stretched 0.4 feet beyond its natural length. How…

A: Given : F1=1 pounds x1=0.4 feet x2=07 feet In this question we have to find the work done in…

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: What distance can a crane lift a 55.0 N box, if it expends work of 2.00 x 104 Joules?

A: given ;    force, F = 55.0 N , work done = 2.00 x 104  Joules  formula used;     W = F x d   where,…

Q: A 4 kg object is moving horizontally with a speed of 5 m/s. To increase its speed to 10 m/s, the…

A: As object is moving horizontally, potential energy will remain constant. From work energy theorem,…

Q: A force of 200 N displaces a body by 4 m, calculate the work done (in J). A) 40 B) 500 C) 80 D) 800

A: Given Data: The force applied is, F = 200 N. The displacement happened is, s = 4 m. The work is…

Q: What is the average power needed to move a 1000 kg car from rest in 7 seconds at a rate of 4 m/s^2?

A:

Q: If a person lifts up a heavy box weighing 500 N a distance of 20 cm off the ground, but then gets…

A: We have a box which has a weight of F=500 N that is lifted up to a height h=20 cm=0.2 m off the…

Q: A force of 4 pounds is required to hold a spring stretched 0.2 feet beyond its natural length. How…

A:

Q: A force of 1 pounds is required to hold a spring stretched 0.2 feet beyond its natural length. How…

A: Given  Force, F = 1 lb  Stretching distance from its natural length , x = 0.2 ft  From Hooke's law-…

Q: A bodybuilder lifted a 1000 N weight 20 cm above his head as shown in the figure below. The athlete…

A: Given, weight, mg = 1000 Ndistance above his head, h = 20 cmheight of the bodybuilder, L =180 cmg =…

Q: that

A: Given, Mass(M)=13 kg. Displacement=65 cm=65/100 m=0.65 m. g=9.8 m/s²

Q: A 5.0-kg box is moving horizontally at 6.0 m/s. In order to change its speed to 10.0 m/s, the net…

A:

Q: What is the average power must produce to accelerate car with 1500 kg from rest to the speed 30…

A:

Q: If 12 J of work is needed to stretch a spring from 11 cm to 15 cm and another 20 J is needed to…

A: Given data: The work done for the first case is, W1= 12 J The spring stretched from an initial…

Q: Why does the force of gravity does no work on a car that rolls down a hill but no work when it rolls…

A: Actually there is a small mistake in the given question. The question is the force of gravity does…

Q: At the time of throwing a ball up, it has acquired the kinetic energy of 30 J. To what height it…

A: According to energy conservation law, total energy imust reamin the same. At the initial point,…

Q: A bag of wheat weight 130 kg. To what height should it be raised so that potential energy is 150 J ?…

A:

Q: If 54 J of work are needed to stretch a spring from 10 cm to 16 cm and 90 J are needed to stretch it…

A: Given Work needed to stretch a spring from 10 cm to 16 cm- 54[J] Work needed to stretch it from 16…

Q: How much work does it take to lift a 30.0 N bag 10.0 m high in 5.00 s?

A:

Q: A force of 7 pounds is required to hold a spring stretched 0.6 feet beyond its natural length. How…

A: The required force to stretch the spring by ∆x = 0.6 ft is F1 = 7lb so by the spring force law i.e.…

Q: Why does one get tired when pushing against a stationary wall when no work is done on the wall?

A: Work done can be calculated as the product of the displacement and the force applied.