Group Problem Week 9

A horizontal rope with 15 N tension drags a 25 kg box 4.0 m to the left across a horizontal surface. Part A How much work is done by tension? Express your answer with the appropriate units. WT = Value Units Submit Request Answer Part B How much work is done by gravity? Express your answer with the appropriate units.

Part A A horizontal rope with 15 N tension drags a 25 kg box 1.5 m to the left across a horizontal surface. How much work is done by tension? Express your answer with the appropriate units. HÁ WT = Value Units Submit Request Answer Part B How much work is done by gravity? Express your answer with the appropriate units. HA Wg = Value Units Submit Request Answer

Part A Suppose a box of mass m is being pulled across the ground with a horizontal force Fl = Ar?, where A is a constant, from the position z = 0 to z=d. Find an expression for the work done by Fpull on the box. Express your answer in terms of some, all, or none of the variables A and d. W = Submit Request Answer rovide Feedback Next> 31 O MAR 51 W X MacBook Air F10 F9 F6

Practice with workcontext You want to practice using the notions of work and energy in physics situations. You imagine a block pulled on a horizontal surface (along an x-axis), without friction, for which you are looking for the final velocity. Known information: the mass of the block;the tension in the rope;the initial speed of the block;move. Schematization Draw a diagram of the object that interests us. Draw your x and y axes. Draw and name each force experienced by the object of interest and identify its displacement. Modelization Design a model to calculate the modulus of the block's final velocity as a function of known parameters, using the notions of work and energy. Then test your model with the following values: Block mass: 7 kg Initial Velocity: vi = (3.6 i ) m/s Displacement: s = (4.4 i) m Tension in the string: T = (17.2 i ) N

A lego robot is tied to a string and swung around in a circle. What is the work done by the string while the robot travels from point A to B? I Backup link to image (opens in new tab). Positive Negative Not enough information given g

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Part C

Part A How much work does an elevator motor do to lift a 1300 kg elevator a height of 100 m ? Express your answer with the appropriate units. Templątes Symbols undo regdo feset keyboard shortcuts help Wext = Value Units Submit Request Answer Part B How much power must the motor supply to do this in 47 s at constant speed? Express your answer with the appropriate units. Templates Symbols undo redo Teset keyboard shortcuts help P = Value Units Submit Request Answer

A 1300-kg elevator is lifted at a constant speed of 1.3 m/s through a height of 20 m Part A How much work is done by the tension in the elevator cable? Express your answer to two significant figures and include appropriate units. Value Units Submit Request Answer Part B How much work is done by gravity? Express your answer to two significant figures and include appropriate units. HÅ ? Value Units Submit Request Answer

Part A Suppose a box is being pulled horizontally a distance d with two forces acting on it, one along the direction of motion (F1) and the other at an angle 0 above the horizontal (F2). What is the net work done on the object by these forces? Express your answer in terms of some, all, or none of the variables F, F2, d, and 0. HVα ΑΣ φ W = Submit Request Answer

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C. Suppose the resultant force acted on an object that was at the origin and resulted in the displacement vector d =. How much work was done by the resultant force on the object? Use your answer from part b as appropriate. d. Using your results from parts b and c, what is the measure of the angle between the resultant force and displacement vector?

A 1400-kg elevator is lifted at a constant speed of 1.5 m/s through a height of 25 m. Part A How much work is done by the tension in the elevator cable? Express your answer to two significant figures and include appropriate units. ? Value Units Submit Request Answer Part B How much work is done by gravity? Express your answer to two significant figures and include appropriate units. HẢ ? Value Units

Please solve this multiple choice question correctly and provide correct option as well as neat and clean work

IP To clean a floor, a janitor pushes on a mop handle with a force of 69.1 N. Part A If the mop handle is at an angle of 55° above the horizontal, how much work is required to push the mop 0.58 m ? Express your answer using two significant figures. Πνα ΑΣφ ? W = J Submit Previous Answers Request Answer

A man cleaning a frictionless floor pulls a vacuum cleaner with a force F of magnitude 50 N at an angle of 30° withthe horizontal. a. Draw a labelled free body diagram showing all the forces that act on the vacuum cleaner.b. What is the magnitude of the work done by the weight of the vacuum cleaner? Explain briefly.c. Calculate the work done by the force F on the vacuum cleaner as the vacuum cleaner isdisplaced 3 m to the right.

Part A How much work does it take to stretch a spring with k = 250 N/m 10 cm from equilibrium? Express your answer in joules. femplates Symbols undo redo reset keyboard shortcuts help W = J Submit Request Answer Part B How much work does it take to stretch the spring from 10 cm to 20 cm from equilibrium? Express your answer in joules. Templates Symbols undo redo reset keyboard shortcuts help W = J Submit Request Answer

Ayoung woman on a skateboard is pulled by a rope attached to a bicycle. The velocity of the skateboarder is v = (4.6 m/s )ê and the force exerted on her by the rope is F = (17 N)â + (12 N)ỹ. Part A Find the work done on the skateboarder by the rope in 25 seconds. Express your answer using two significant figures. ? W = J Submit Previous Answers Request Answer X Incorrect; Try Again; 5 attempts remaining Review your calculations and make sure you round to 2 significant figures in the last step. Part B Assuming the velocity of the bike is the same as that of the skateboarder, find the work the rope does on the bicycle in 25 seconds. Express your answer using two significant figures. Πνα ΑΣφ ? W = J

Consider the following physical situations. For each case, determine the angle between the indicated force (in boldface type) and the displacement ("theta" in the work equation). a. 0 degrees b. 180 degrees c. 90 degrees d. 30 degrees e. 60 degrees A rightward applied force is used to displace a television set to the right. The force of friction acts upon a rightward-moving car to bring it to a stop. A waiter uses an applied force to balance the weight of a tray of plates as he carries the tray across the room. The force of air resistance acts upon a vertically-falling skydiver. The force of friction acts upon a baseball player as he slides into third base. An applied force is used by a freshman to lift a World Civilization book to the top shelf of his locker. A bucket of water is tied to a string and tension supplies the centripetal force to keep it moving in a circle at constant speed. An applied force acting at 30-degrees to the horizontal is used to displace an object to the…

To push a stalled car, you apply a 490 N force at 13 ° to the car's motion, doing 860 J of work in the process. Part A How far do you push the car? Express your answer in meters. femplates Symbols undo redo reset keyboard shortcuts help, x = m Submit Request Answer

Hint 1 A small block of mass 246 g starts at rest at A, slides to B where its speed is vg = 5.4 m/s, then slides along the horizontal surface a distance 10 m before coming to rest at C. A 4.0 m B -10 m- Image Description a. What is the work of friction along the curved surface? W; J b. What is the coefficient of kinetic friction along the horizontal surface? Submit Question

Constants I Periodic Table The horizontal force Fp = 150 N force pushes the block of 5.0 m up along the 32° incline? A coefficient of friction Fp= 18 kg 150 N 32° plik = 0.13. [Hint: Work-energy involves net work done.]

Part A If the coefficient of kinetic friction is 0.24, how much work do you do when you slide a 50 kg box at constant speed horizontally across a 4.2 m -wide room? Express your answer in joules. Templates Symbols undo redo reset keyboard shortcuts help W = J Submit Request Answer

Calculate the work done on the suitcase by F. Express your answer with the appropriate units. A luggage handler pulls a 20.0 kg suitcase up a ramp inclined at 33.0° above the horizontal by a force F of magnitude 161 N that acts parallel to the ramp. The coefficient of kinetic friction between the ramp and the incline is u = 0.300. The suitcase travels 3.70 m along the ramp. HẢ Wr = 627.9 Submit Previous Answers Request Answer X Incorrect; Try Again; 3 attempts remaining Part B Calculate the work done on the suitcase by the gravitational force. Express your answer with the appropriate units. HÁ ? Value Units Submit Request Answer Part C Calculate the work done on the suitcase by the normal force Express your answer with the appropriate units. HẢ ? Wa = Value Units

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A 1400-N crate rests on the floor.     Part A How much work is required to move it at constant speed 5.0 m along the floor against a friction force of 310 N. Express your answer to two significant figures and include the appropriate units.