A 4-kg object is slowly lifted 1.5 m. How much work is done against gravity? Repeat if the object is lowered instead of lifted.

Q: In the figure, the rock weighs 130 lb and is lifted 1 ft by the lever. F Fulcrum 3F 3d (a) How much…

A: Given data: a)Force F=130lb    Distance d=1 ft b) Distance d=3 ft

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…

A:

Q: A box is pulled 20m across a warehouse by a 50N force. The force makes a 35° angle with the…

A: Given that, Force = 50 N In first case, Distance = 20 m Angle = 350  In second case, Distance 10 m…

Q: Bob lifts three 1x102kg books 2m above the ground. How much work would Bob do if you lifts all three…

A:

Q: A 50-kg crate sits at rest on a floor. A person pushes on the crate with a horizontal force of 600N,…

A: According to work energy theorem: Net work done = Change in kinetic energy We+Wf=12mv2-12mu2 We and…

Q: Provide an example of a situation that would help explain the concept of "zero work", in regards to…

A: In physics the work may be defined as the dot product of force and displacement. By dot product of…

Q: A crane lifts a 650 kg beam vertically upward 10.8 m and then swings it westward 18 m. How much work…

A: The formula for workdone is W=Fxcosθ

Q: A 4-N force is applied to a 2-kg object that is moving at 3 m/s. This force is parallel to the…

A: Work done = Force × displacement

Q: A 2.5 kg crate sliding along the floor has an initial velocity of 2.1 m/s in the +x direction.…

A:

Q: 1040 kg car is travelling at a velocity of 8.2 m/s.  How much work must be done by the engine to…

A:

Q: You attempt to lift a 1200 N barbell for 10 min, excreting a 1200 N force, but won't move. How much…

A: Required : Amount of work done.

Q: A 5 kg book is pushed across a table with a velocity of 1 m/s. Once the person pushing lets go the…

A:

Q: Acontainer with a mass of 5 kg is lifted to a height of 8 m How much work is done by the…

A: Given, Mass, m=5 kg Height, h=8 m To Find: Work done by gravitational force and external force…

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: 102 kg man climbs a 3.2 meter high staircase at constant speed. How much work has he done? (=9.8 m/s…

A:

Q: An acorn falls from

A: Kinetic energy = (1/2) mv2  Potential energy = mgh

Q: If gravity is pulling a 0.15 kg ball down 2.0 meters, what is the magnitude of the force doing work…

A:

Q: A 2 kg rock is thrown upward, with a speed of 5 m/s and returns to the same spot, with the same…

A: Give Mass m = 2 kg Initial velocity is U = 5 m/s in upward direction.  Final velocity is V = 5 m/s…

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: a child pulls a box of 6kg a distance of 10 meters along a rough horizontal surface with a…

A:

Q: You are bench pressing weights and have a 50 kg mass lifted above your chest.  How much work do you…

A: The expression for the required work done is,

Q: An automobile is pushed 14 ft by a woman exerting 117 lb of force horizontally on the vehicle. How…

A: Given data, Force applied F=117 lb Displacement d=14 ft