The earth moving around the sun in a circular orbit is acted upon by a force and hence work must be done on the earth by the force. a) True b) False
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A: The correct answer is B. The work done on the Earth is zero, since the force of gravity is always…
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The earth moving around the sun in a circular orbit is acted upon by a force and hence work must be done on the earth by the force.
a) True
b) False
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- 11. A person pushes a m = 2.60 kg carton a distance d = 4.20 m along the floor by a constant force of magnitude F = 16.0 N directed at an angle 0 = 30.0° below the horizontal as shown in the figure. Assume the floor is frictionless. (a) Determine the work done on the carton by the applied force (the force on the carton exerted by the person). (b) Determine the work done on the carton by the normal force exerted by the floor. (c)Determine the work done on the carton by the gravitational force. (d)Determine the work done by the net force on the carton. m(True or False) The work done by the net force equals the change in potential energy. (True or False) The work done by nonconservative forces equals the change in total energy. (True or False) If a force and a change in displacement are in opposite directions, then the force does negative work. (True or False) The work done by the net force equals the change in kinetic energy. (True or False) The work done by the gravitational force equals the negative change in potential energy.1-An object of mass m=2kg which is initially at rest is pushed upward by a horizontal force F= soN along the incline surface as shown in the figure. The coefficient of friction between the mass and the surface is =O.5. The block traveled a distance =10m along the incline under the action of F. Determine a) Work done by the horizontal force b) Work done by the friction force c) Work done by the gravitational force d) Work done by the normal force e The acceleration of the mass f The velocity of the block after it traveled the distance d (g= 10 m/s°, = 37 ° COS37° = 0.8, sin37° = 0.6)
- A 1350-kg car is traveling with an initial speed of 25.0 m/s. Determine the car's speed after -2.20 × 10° J of net work is done on the car. X m/sYou are loading a refrigerator weighing 2.29×103 N onto a truck, using a wheeled cart. The refrigerator is raised 1.00 m to the truck bed when it is rolled up a ramp.Calculate the minimum work that must be done by the force you apply if the ramp is at an angle with the horizontal of 35.0°.Calculate the minimum work that must be done by the force you apply if the ramp is at an angle with the horizontal of 14.0°.A 2,200-kg pile driver is used to drive a steel I-beam into the ground. The pile driver falls 4.60 m before coming into contact with the top of the beam, and it drives the beam 15.0 cm farther into the ground as it comes to rest. Using energy considerations, calculate the average force the beam exerts on the pile driver while the pile driver is brought to rest. 588925.42 magnitude Write an expression for the work done by all of the forces acting on the beam as it moves into the ground and relate that work to the change in energy of the pile driver in order to find the force that the beam exerts on the pile driver. N
- A block of mass m = 2.00 kg is pushed a distance d = 7.80 m along a frictionless, horizontal table by a constant applied force of magnitude F = 17.0 N directed at an angle θ = 26.0° below the horizontal as shown in the figure below. a) Determine the work done on the block by the applied force. b) Determine the work done on the block by the normal force exerted by the table. c) Determine the work done on the block by the gravitational force. d) Determine the work done on the block by the net force on the block.1) In the formula given for the calculation of work, the variable F represents: A) The angular coordinate of the vector d when it is written in polar coordinates B) The scalar magnitude of the force doing work C) The angular coordinate of the vector F when it is written in polar coordinates D) The scalar magnitude of the displacement through which the system moves while the force isapplied E) The direction of the force acting on the system F) The angular difference between the vectors F and d G) The diameter of the system H) The weight, or force due to gravity, on the system I) The work done by the force F 2) In the formula given for the calculation of work, the variable d represents: A) The angular coordinate of the vector d when it is written in polar coordinates B) The scalar magnitude of the force doing work C) The angular coordinate of the vector F when it is written in polar coordinates D) The scalar magnitude of the displacement through which the system moves while the force…A flashlight supported by a single cable descends a down a narrow tunnel and is gradually slowing down. There are only two forces acting on this flashlight (Ft and Fg). Which one of the following statements is true? The work done by the tension force is zero joules. b) The work done by the gravitational force is zero joules. c) The net work done by the two forces is zero joules. d) The magnitude of the work done by the gravitational force is larger than that done by the tension force. e) The magnitude of the work done by the tension force is larger than that done by the gravitational force. ‹
- If an object is moved a distanced up an inclined plane at an angle of θ with respect to the horizontal, the normal force from the plane on the object is FN=mgcosθ. What is the work done by the normal force during this motion? A) (mgcosθ)d B) (−mgcosθ)d C) 0 D)mgd E)−mgdYou are loading a refrigerator weighing 2.29×103 N onto a truck, using a wheeled cart. The refrigerator is raised 1.00 m to the truck bed when it is rolled up a ramp.Calculate the minimum work that must be done by the force you apply if the ramp is at an angle with the horizontal of 35.0°.Calculate the minimum work that must be done by the force you apply if the ramp is at an angle with the horizontal of 14.0°A block of mass 2.7 kg is pushed 2.6 m along a frictionless horizontal table by a constant 21 N force directed 32 degrees below the horizontal. d) Determine the work (in J) done by the force of gravity. e) Determine the work (in J) done by the net force on the block.