1. A force of 10.5 N is used to move a box on a horizontal, friction-free...
1. A force of 10.5 N is used to move a box on a horizontal,
friction-free surface, at a distance of 8.5 m. (a) Determine the
work that the force performs on the box. (b) What work does the
force do if you move the box on a 300-slash surface at a distance
of 4.5 m? 10 points
2. A 10.0 g bullet has a speed of 1.2 km/s. (a) What is the kinetic
energy of the bullet? (b) What is the kinetic energy of the bullet
if its speed is halved? 10 points
3. A small motor is used to lift a block load that has a weight of
800 N up to a height of 10.0 m in 20.0 seconds. What minimum power
should this engine provide? 10 points
Homework Answers
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1. A force of 10.5 N is used to move a box on a horizontal,
friction-free...
A force of 10.5 N is used to move a box on a horizontal, friction-free surface,...
A force of 10.5 N is used to move a box on a horizontal, friction-free surface, at a distance of 8.5 m. (a) Determine the work that the force performs on the box. (b) What work does the force do if you move the box on a 30 degree surface at a distance of 4.5 m? 10 point
A horizontal force of 150 N is used to push a 40-kg box on a rough,...
A horizontal force of 150 N is used to push a 40-kg box on a rough, horizontal surface through a distance of 6 m. If the box moves at a constant speed, find: a) the work done by the 150 N force b) the work done by friction c) the coefficient of kinetic friction
7. (20 pts) A force of 50 N is used to move a 5 kg box...
7. (20 pts) A force of 50 N is used to move a 5 kg box 30 m across a level floor a. How much work was done on the box? b. If the movement takes 10 seconds, what is the average velo city of the box during the move? c. What is the average kinetic energy of the box during the move? d. What is the change in potential energy as a result of this move?
7. (20 pts) A force of 50 N is used to move a 5 kg box...
7. (20 pts) A force of 50 N is used to move a 5 kg box 30 m across a level floor. 2. How much work was done on the box? b. If the movement takes 10 seconds, what is the average vclocity of the box during the move c What is the average kinetic energy of the box during the move? d. What is the change in potential energy as a result of this move?
1. A car surrounds a radius curve of 50.0 meters. If the mass of the car...
1. A car surrounds a radius curve of 50.0 meters. If the mass of the car is 1000 kg and fast is 30.0 mph, determine the force that keeps the car in the curve. (1 mph = 0.447 m/s). show procedure and equations 2>. A force of 10.5 N is used to move a box on a horizontal, friction-free surface, at a distance of 8.5 m. (a) Determine the work that the force performs on the box. (b) What work...
A boy pulls a 20.0-kg box with a 160-N force at 39° above a horizontal surface....
A boy pulls a 20.0-kg box with a 160-N force at 39° above a horizontal surface. If the coefficient of kinetic friction between the box and the horizontal surface is 0.18 and the box is pulled a distance of 30.0 m, what is the net work done on the box?
attraction if the distance between these two masses is halved? Energy and Oscillations 4 A force...
attraction if the distance between these two masses is halved? Energy and Oscillations 4 A force of 8O N used to push a table across a room does 800 J of wok. How far the chair move in this process? S. A net force of 60 N accelerates a 5.0 kg mass over a distance of 10 m. What is the work done by this net force? a. b. What is the increase in kinetic energy of the mass? 6-...
7. (20 pts) A force of 50 N is used to move a 5 kg box 30 m across a level floor. a. How much work was done on the box?...
7. (20 pts) A force of 50 N is used to move a 5 kg box 30 m across a level floor. a. How much work was done on the box? b. If the movement takes 10 seconds, what is the average velocity of the box during the move? c. What is the average kinetic energy of the box during the move? d. What is the change in potential energy as a result of this move?
A horizontal force of 150 N is used to push a 38.0 kg packing crate a...
A horizontal force of 150 N is used to push a 38.0 kg packing crate a distance of 6.85 m on a rough horizontal surface. If the crate moves at constant speed, find each of the following. a) find the work done by the 150N force: b) find the coefficient of kinetic energy between the crate and rough surface
A) A 50.0 kg box rests on a horizontal surface. The coefficients of static and kinetic...
A) A 50.0 kg box rests on a horizontal surface. The coefficients of static and kinetic friction between the box and the surface are 0.300 and 0.200, respectively. What is the friction force on the box if a horizontal 175 N push is applied to it? Explain. B) A horizontal force of 250 N is applied to the box. After the box moves a distance d from rest, the speed of the box is measured to be 6.4 m/s. use...
A horizontal force of 150 N is used to push a 40-kg box on a rough, horizontal surface through a distance of 6 m. If the box moves at a constant speed, find: a) the work done by the 150 N force b) the work done by friction c) the coefficient of kinetic friction
7. (20 pts) A force of 50 N is used to move a 5 kg box 30 m across a level floor a. How much work was done on the box? b. If the movement takes 10 seconds, what is the average velo city of the box during the move? c. What is the average kinetic energy of the box during the move? d. What is the change in potential energy as a result of this move?
7. (20 pts) A force of 50 N is used to move a 5 kg box 30 m across a level floor. 2. How much work was done on the box? b. If the movement takes 10 seconds, what is the average vclocity of the box during the move c What is the average kinetic energy of the box during the move? d. What is the change in potential energy as a result of this move?
attraction if the distance between these two masses is halved? Energy and Oscillations 4 A force of 8O N used to push a table across a room does 800 J of wok. How far the chair move in this process? S. A net force of 60 N accelerates a 5.0 kg mass over a distance of 10 m. What is the work done by this net force? a. b. What is the increase in kinetic energy of the mass? 6-...
7. (20 pts) A force of 50 N is used to move a 5 kg box 30 m across a level floor. a. How much work was done on the box? b. If the movement takes 10 seconds, what is the average velocity of the box during the move? c. What is the average kinetic energy of the box during the move? d. What is the change in potential energy as a result of this move?
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