A person holds a bundle of hay over his head for 30 minutes and gets tired. Has he done some work or not? Justify your solution.

Q: A crane lifts a 650 kg beam vertically upward 9.6 m and then swings it westward 18 m. How much work…

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Q: A 67 kg yak has an average power output of 200 W. How long can a yak climb a 3km high mountain?…

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Q: The work done by a force that varies in magnitude can be obtained from which of the following…

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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: When 20 N of force is applied to a spring of natural length 2 m, the resulting compression is 0.5 m.…

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Q: A record for stair climbing was achieved by a man who raced up the 1600 steps of the Empire State…

A: Given data from question,  Number of steps = 1600 Height = 320m Time taken = 10.2min Weight of man =…

Q: what is the total work done by the force over the distance x=0 to x=15.0m?

A: Work done is basically the area under the graph of Force vs displacement!

Q: Estimate the work (in J) you do to mow a lawn 20 m by 20 m with a 60-cm-wide mower. Assume you push…

A: in this question  we use simple work equation.

Q: From what height would an automobile have to fall to gain the kinetic energy equivalent to what it…

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Q: Find the work done in joules by gravity as an object of the mass m=5 kg is raised up at constant…

A: Given : m = 5 kg h1 = 23 m h2 = 69 m g = 10 m/s2

Q: A 1700 kg car coasts on a horizontal road with a speed of 23 m/s. a) How much work must be done by…

A: Given data: Mass (m) = 1700 kg Initial velocity (v0) = 23 m/s Final velocity (vf) = 17 m/s Required:…

Q: As an object moves from point A to point B only two forces act on it: one force is nonconservative…

A: The work done by non-conservative is responsible for the mechanical energy of system. When work done…

Q: a box of animal crackers is dragged at constant speed across a surface by horizontal force of 20.0 N…

A: solution is given by

Q: As a woman carries her suitcase up a flight of stairs, she does work against gravity. If the mass of…

A: mass of suitcase (m) = 10 kg Height of stairs (h) = 12 m g = 9.8 ms2

Q: As a young man, Tarzan climbed up a vine to reach his tree house. As he got older, he decided to…

A: To determine: A young man Tarzan climbed up a vine to reach the tree house, what did the king of…

Q: Calculate the total work done on a 1550-kg car as it coasts 20.4 m down a hill with f = 5.00°. Let…

A: Let m be the mas of the car, s is the distance traveled down the hill, and θ is the inclination…

Q: Several forces are applied to an object. If the object moves 40 m along the horizontal, and if one…

A: Given: The distance moved by an object is d=40 m. The force in the opposite direction of motion is…

Q: A physics professor tries to barricade himself in his office by pushing a 30 kg desk in front of the…

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Q: Find the work done in joules by gravity as an object of the mass m=11 kg is raised up at constant…

A: Mass, m = 11 kg  Height, h1=29 m and h2=78 m  Acceleration, a = -g = -10

Q: A leaky bucket, which weighs 2 N empty and initially has 10 N worth of water in it, is lifted into…

A: Work done will be equal to change in the potential energy of the bucket. Let the potential energy at…

Q: You drag your 30 kg suitcase 1200 m thru the Chicago airport at essentially constant velocity 2.0…

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

A: Answer Given  Initial speed of the car vi = 155 km/h We have to change the value into m/s 155 km/h =…

Q: In the figure shown, if the mass (m36 Kg) is moving with constant speed and traveled a distance d314…

A: mass (m)= 6 kg distance covered (d) = 14 m speed = constant F = 15 N θ = 53o

Q: If it takes 4.00 J of work to stretch a Hooke's-law spring 5.0 cm from its unstressed length,…

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Q: Calculate the total work done by the system from x = 1.40 m to x =4.80 m when force applied on the…

A: Given data : Force, Ft=5.00Nmx i^ + 7.00 Nm2x2 j^ + 9.00 Nm3x3 k^ Displacement x1=1.40 m…

Q: What work is done by a force F = (8.00 x N)î + (5.00N), v 7; =-(5.00 m)î – (3.00 m)j? with x in…

A: Given : Force, F→=(8.00xN)i^+(5.00N)j^ Initial position of particle, ri→ = (5.00m)i^+(3.00m)j^ Final…

Q: Find the work done in joules by gravity as an object of the mass m=14 kg is raised up at constant…

A: Mass of object m = 14 kg Initial height h1 =34 m Final height h2 = 75 m g = 10 m/s²     Concept…

Q: Which of these is an example of no work being done?   a. a child pushes a toy car across a flat…

A: Work done is the energy transferred when a force is displaced by a distance.

Q: While pushing her younger brother on a swing, Ivy exerted an average force of 446 N through a…

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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: Is the work done by the applied force positive or negative when a heavy body is lowered to the…

A: Let h be the height at which the body is initially, F be the applied force, W be the work done by…

Q: How much work does the force F(x) = (−2.0/x) N do on a particle as it moves from x = 2.0 m to x =…

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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: It requires 76 J of work to stretch an ideal very light spring from a length of 0.45 m to a length…

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Q: A 28 kg air compressor is dragged up a rough incline from r1=1.9i+2.2j m to r2=9i+1.4j m, where the…

A: The expression for the work done by the gravity is W=mgh       h-displacement along y axis=28 kg-9.8…

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

A: Given: Force F = 40 N. Angle = 35o Distance ∆x = 30 m To determine: Work done Formula used: W = F ×…

Q: Find the work done in joules by gravity as an object of the mass m=7 kg is raised up at constant…

A: The mass of the object is 7 kg.  The initial height is 40 m.  The final height is 67 m.  The work…

Q: While training for breeding season, a 380 gram male squirrel does 32 pushups in a minute, displacing…

A: Given: m = 380 g = 0.38 kg  number of push ups, n = 32  height, h = 8.5 cm = 0.085  m

Q: If it takes 4.00 J of work to stretch a Hooke's-law spring 5.0 cm from its unstressed length,…

A: Work done to stretch the spring from its unstretched length to 5 cm  = 4 Joules Using, formula for…

Q: What is the power output for a 60.0-kg woman who runs up a 3.00 m high flight of stairs in 3.50 s,…

A: The mass of the woman is m=60 kg. The height is h=3 m. The time is t=3.50 s. The final speed is vf=2…

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

A: Given data:  Initial Speed of the car (V0) = 155 km/h Free falling acceleration (g) = 10 m/s2…

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: Given data : Initial force = 0 N Final force = 35 N Initial stretch in spring = 45 cm = 0.45 m Final…

Q: Consider again pulling a 60 m rope up a cliff face, where the rope has a mass of 66 g/m. At what…

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Q: What is the power output for a 60.0 kg person who runs up a 3.00 m high flight of stairs in 3.50 s,…

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Q: How much work (in J) is required to move a box that weighs 18 kg upward by 35 cm? Use the fact that…

A: Given, Mass  of the box m = 18 Kg Upward distance h = 35 cm = 0.35 m Acceleration due to gravity g =…

Q: Find the work done in joules by gravity as an object of the mass m=6 kg is raised up at constant…

A: Here, we are given Mass of object, m = 6 Kg Initial height of the object from the ground, h1 = 32 m…