A 80.0 kg mail bag hangs by a vertical rope 3.5 m long. A postal worker then displaces the bag to a position 2.4 m sideways from its original position, always keeping the rope taut.

Q: A chain of length 4 m is kept on a table. 2 m of the chain hangs freely from the table’s edge. The…

A: Given: length = 4 m table = 2 m mass of the whole chain = 8 kg

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 boy is pulling his sister in a wagon, as shown in the figure. He exerts a force of F = 43.5 N at…

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Q: A student applies a horizontal force to move a crate at a constant speed across a rough floor. A…

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Q: Which of these is equivalent to the work-energy theorem? The work done by friction is the friction…

A: Introduction We know that the work-energy theorem is related to work and energy, here we deal with…

Q: which of the following is  negative work being done?   Question 10 options:   A man pushes with a…

A: Correct option is (c) An object is pushed with a force of 25 N when the frictional force is a…

Q: A man pushes a block of mass M along a frictionles ramp at constant speed to a heighth as shown in…

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Q: Is work done whenever an object moves through a distance? Explain.

A: SOlution: To explain, if the work done whenever an object moves through a distance

Q: The figure represents the work curve. How much work is done? 因 0 5 x (m) F (N)

A: Answer : Work-done is nothing but the area under that straight line in the above Force-Displacement…

Q: hi

A: Given value--- mass = 10 kg. force = 10 N. distance = 5 m. We have to find--- work done by…

Q: How far must a 50 N force need to push an object to do 10 J of work? Your answer: 0.2 m 5 m 40 m 60…

A: Here given a force of 50 N. The workdone is 10 J.We have to calculate the distance covered by that…

Q: If the crate described in question #7 was accelerating down the ramp instead of moving at a constant…

A: The correct choice.

Q: A 450-kg pile driver is raised 15 m above ground. a) Assuming it is raised at a constant velocity,…

A: Write the given values with suitable variables. m=450 kgh=15 m Here, m denotes the mass and h…

Q: A middle school kid is pushing a lawn mower with 60 N of force at an angle 31 degrees below the…

A: Here, applied force(F) = 60 N displacement(S) = 400 m The angle(θ) between the applied force and…

Q: A mother carries a 15 kg child up the stairs to bed. If the stairs have a vertical height of 3.2 m,…

A: The work done by the gravity on the child can be given as

Q: You apply a constant force of (33 N) i- (42 N) j to a loaded supermarket pushcart as it undergoes a…

A: From the question, it is given that- Constant force applied: F→=(33N)i^-(42N)j^Displacement of…

Q: A man is pushing a lawnmower as shown in the diagram above with an angle of 0-30 below the…

A: Given data:  Angle (θ) = 30°,below the horizontal  Force (F) = 100 N Work done (W) = 1000 J…

Q: Lifting a 5000 N piano up to window 20 M off the ground would not be fun. It would be easier if you…

A: Work done by an object when the force F is applied to a body of mass m, which inturn displaces it to…

Q: If we know that a force of 5 N is applied on an object while the object moves 2 m, can we determine…

A: Given : F = 5 N d = 2 m

Q: A factory worker pushes a 30.0 kg crate a distance of 3.7 m along a level floor at constant velocity…

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Q: How much work in the vertical direction is required for a 68 kg cyclist to ride a 10 kg bike 1500…

A: distance travelled along the slope= D=1500 m height attained in this climb= H tan100=HD H=264.5 m

Q: the influence of a force that varies with position as shown in the figure below. The scale of the…

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Q: In pulling two identical carry-on bags through the airport, Mr. Beall and his 7 year o son, James,…

A: James uses a greater force because he is shorter, making a smaller angle with the ground

Q: A book is moved on a rough wooden table from position A to position B. What is TRUE about the work…

A: Since, the work done by friction depends on the path taken and also the nature of work done by…

Q: lock is pushed a distance of 2 meters with a force of 20 N that is in the same direction as the…

A: Given Distance traveled by a block is d=2 m Applied force on block is F=20 N

Q: A box is dragged across a floor by a rope, which makes an angle of 600 with the horizontal. The…

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Q: How much work is done by a person lifting a 7.0-kg object from the bottom of a well at a constant…

A: Given Weight or Force = 7.0kg Speed = 4 m/s Time = 1.5s

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

A: We know the expression for work is W= F.scosθ    The force of gravity do work on a car that rolls…

Q: It takes 3 s for 25 g car to go down a 100 incline for 1 m. ? How much work was done by friction?…

A: Given : Time, t = 3 s mass of car, m = 25 g  = 25*10-3 kg Inclination angle, θ = 100 Distance,x = 1…

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: An object is pushed along a horizontal surface with a force of 10 N. If the object is moved 15 m,…

A: To determine,how much work does the pushing force do and How much work does gravity do.given,Force…

Q: A constant force of (400 newtons) parallel to the sloping surface of a (40°) inclined plane pushes a…

A: Given data-                       constant force parallel to the inclines plane = 400 N…

Q: 20 N is needed to slide a box across a room to the right at a constant speed: a) How many Newtons…

A: Let us consider the forces come into picture in the above case,                                 i.…

Q: the force acts on an object, causing it to move parallel to the force. The graph in the figure shows…

A:

Q: How much work is done by a person who pushes a cart with force of 50 newtons if the cart moves 20…

A: The work done by applied force is given by W = FS Cos(θ) Where F = Force, S = displacement, θ =…

Q: The figure below shows a person pushing a box with a force of 2.2 N over a displacement of 2.5 m.…

A: The person exerts a force of 2.2 N on the box over a displacement of 2.5 mFrom Newtons third law of…

Q: A 80.0 kg mail bag hangs by a vertical rope 3.5 m long. A postal worker then displaces the bag to a…

A:

Q: You apply a constant force of (49 N) (52 N) to a loaded supermarket pushcart as it undergoes a…

A:

Q: A body of 4.0 kg is lying at rest. Under the action of a constant force, it gains a speed of 5 m/s.…

A: Given values: Mass, m=4.0 kg Initial speed, u=0 m/s Final speed, v=5 m/s

Q: A ball tied to a string is being whirled around in a circle. What can you say about the work done by…

A: A ball tied to a string is being whirled around in a circle.

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: Graphical Interpretation of Work: The resultant force on an object over a 0.50-s time interval is…

A: Given data:  Force vs displacement graph Required: The work done (W)

Q: How much work is done by a person who pushes a cart with a force of 50 Newton’s if the cart moves 20…

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Static and Kinetic Friction

Kinetic friction comes into existence when there are moving surfaces means in other words we can say that the force which comes into existing between moving surfaces is known as kinetic friction.