Discuss whether any work is being done by each of the followingagents and, if so, whether the work is positive or negative: (a) a chicken scratching the ground, (b) a person studying,(c) a crane lifting a bucket of concrete, (d) the force of gravityon the bucket in part (c), (e) the leg muscles of a person inthe act of sitting down.

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

A: The work done is given by  W = 12Kx2 where,  K is the spring constant and x is the stretch length.

Q: The human small intestine moves food alongits 6.9-m length by means of peristalsis, a contraction…

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Q: A force F = (4xi-3y2j)Nacts on a particle, the particle moves along the x-axis from x= 1 to x = 4m.…

A: Write the expression of the force vector on a particle.   F=4xi-3y2j   Write the expression of the…

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 force is given by the vector F = (3i+5j) N and moves from the point (2i+6j) m to the point (6i…

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Q: Find the work done (in J) by a force, F=3i - 8j N acts on a particle and displaces it Ar = 2i - 7j m

A: If a force (F) displaces a body by some distance (s), then a work (W) is said to be done by a force…

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: Cite an example in which a force is exerted on an object without doing work on the object.

A: The work done will be zero when the applied force on an object is perpendicular to the displacement…

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°…

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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: An apple weighing 1 N falls throughas a distance of 1 m. How much work is done on the apple by the…

A: weight of apple(W)= 1N Distance(d)=1m Work done=F.d=Fdcosθ F is force θ is angle between force and…

Q: Find the work done by 45N force in pulling the suitcase at an angle of 50d egrees with respect to…

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Q: Find the work done by a force of constant magnitude F=0,1KN.If the displacement of the body is…

A: Given data: Force, F=0.1 kN = 100 N Displacement, r=100 mm =100×10-3 m = 0.1 m Angle between…

Q: find the work done by the force f=y2i+x3j,where force is measured in newtons ,in moving an object…

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Q: How much work is done by a 59 kg ninja watrior in climbing a ladder that is 9 meters long? Express…

A: Mass of ninja warrior (m) = 59 kg  Length of ladder (L) = 9 m

Q: Which situation DOES NOT demonstrate a work done? O A lady in an ascending elevator. O A waiter…

A: The work done by a force can be defined as the product of the displacement of an object and the…

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: Find the work available for a car weighing 1290N, that travels 200. meters

A: 1)weight of car = 1290 N distance travelled = 200 m

Q: The power delivered by a constant force is given by P=FO-vO, The power exerted by gravity as it…

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Q: A 10N horizontal force is exerted on a 100kg object that slides on a frictionless, horizontal…

A: First method: According to the Newton’s second law, the acceleration of the object is, F=maa=Fm=10…

Q: what rate of work is developed by a 50.0 kg jogger who runs around a 1.00 km track three times in…

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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: 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: 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: Give 5 situations in which work is not done on it.

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Q: To clean a floor, a janitor pushes on a mophandle with a force of 50.0 N. (a) If the mop handle is…

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Q: Suppose a 51.5-kg woman does 50 deep knee bends in which her center of mass is lowered and raised…

A:

Q: Cite an example wherein  force exerted on a body does no work. Explain.

A: Work done is defined as the product of force, displacement and cosine of angle between force and…

Q: How much work is done by gravity when dead lifting a 100.0 kg barbell 81.54 cm from the floor to hip…

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Q: A 50 kg sack of rice was raised to height of 1.2 meter by the delivery boy to the car’s roof, find…

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Q: Can positive work and negative work be done on an object at the same time?

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Q: F = (2ry – 3)î + x²j, (0, 1) a (1, 0}

A: A force F is given and the work done in moving along three different paths a, b and c is being…

Q: Two objects are each displaced the same distance, one by a force F pushing in the direction of…

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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: 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: Describe a situation in which a force is exerted for a long time but does no work. Explain.

A: We consider a situation when an object lifted at height h is displaced a distance x.

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: In the figure shown, if the mass (m=6 Kg) is moving with constant speed and traveled a distance…

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Q: Find the work done to displace body of mass by 3 kg with force of 1.3 N upto 2 m

A: Mass of the body, m=3 kg Force on the object, F=1.3 N Displacement of the body, d=2m

Q: What average mechanical power must a 70.0 - kg mountainclimber generate to climb to the summit of a…

A: Using Work-Energy theorem,

Q: How much work is performed in steadily dragging a sled 20 m horizontally when the force of 80 N is…

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Q: . Find the work done on a lagage of 50 kg. pulled by a string elevated at 45 degrees by force of 100…

A: Given that: F=100Nθ=450d=10 mm=50 kgW=?

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: A catle exertsa constant upward tension of magnitude 2.22 10N on 200 x 10 kg elevator es thmugh a…

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Q: A 10 kg block is pushed with a constant external force of 10 Newtons horizontally on a floor with a…

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Q: When you apply force F = 273N to the right to mave a box by the distance 4.2 m to the right, find…

A: Given Force =273 N  Displaced distance d 4.2m