Physics Work,Power & Energy Level: High School
A block of mass 2.30 kg is pushed 2.29 m along a frictionless horizontal table by a constant 18.0 N force directed 23.6 degree below the horizontal . Determine the work die by the applied force .
Physics Work,Power & Energy Level: High School
A 754 N marine in basic training climbs a 12.5 m vertical rope at a constant speed in 6.6 s . What is the power output ? Answer in units of W
Physics Work,Power & Energy Level: High School
A weight lifter lifts a set of weights a vertical distance of 3.95 m . If a constant net force of 355 N is exerted on the weights , how much net work is done on the weights ? Answer in units of J .
Physics Work,Power & Energy Level: High School
A 20 g bullet is accelerated in a rifle barrel 89.6 cm long to a speed of 686 m=s . Use the work energy theorem to solve the problem . The average force exerted on the bullet while it is being accelerated . Answer in units of N .
Physics Work,Power & Energy Level: High School
It is uncommon during the service of a professional tennis player for the racket to exert an average force of 158 N on the ball . Assume that the ball starts from rest . The ball has a mass of 0.0608 kg and is in contact with the strings of the racket for 0.029 s . What is the kinetic energy of the ball as it leaves the racket ? Answer in units of J .
Physics Work,Power & Energy Level: High School
A 2.54 kg car has a speed of 11.7 m /s , The car then hits a tree . The tree doesn’t move and the car comes to rest . Find the change in kinetic energy of the car .(a) Find the amount of work done by the car as its front is pushed in . Answer in units of J .
(b) Find the magnitude of that pushed .
Physics Work,Power & Energy Level: High School
When a rattlesnake strikes , its head accelerates from rest to speed of 32 m=s in 0.58 s seconds . Assume for simplicity that the only moving part of the snake is its head of mass 140 g .How much (average) power does the rattlesnake need to accelerate its head that fast ?
Physics Work,Power & Energy Level: High School
A 500 kg cart , including the passengers , is initially at rest . When the spring is released , the cart is launched for a trip around the loop-the-loop whose radius is 10 m . Determine the distance the spring of force constant 68000 N/m must be compressed in order that carts speed at the top of the loop is 12 m/s . Ignore friction . Assume that g = 10 m/s^2 .
Physics Work,Power & Energy Level: High School
A block is pushed across a rough horizontal surface from point A to point B by a force P = 5.4 N as shown in the figure at “click here” . The magnitude of the frictional force action on the block between A and B is 1.2 N and points A and B are 0.5 m apart . If the kinetic energies of the block at A and B are 4.0 ad 5.6 J respectively , how much work is done on the block by the force P between A and B ?
Physics Work,Power & Energy Level: High School
An object moving along x axis is acted upon by a force F (x) that varies with position as shown in the figure at “click here“ How much work is done by this force as the object moves from 2m to 8m ?
Physics Work,Power & Energy Level: High School
A skier weighing 0.70 kN goes over a frictionless circular hill as shown in the figure at “click here” . If the skier’s speed at point A is 9.2 m/sec . what is the speed at the top of the hill . Identity what your system is in your solution .
Physics Work,Power & Energy Level: High School
A spring with spring constant 600 N/m is placed in a vertical position with its lower end supported by a horizontal surface . A 2.0 kg block that is initially 0.40 m above the upper end of the spring is dropped from rest onto the spring . What is the kinetic energy of the block at the instant it has fallen 0.50 m (compressing the spring 0.10 ) ?
Physics Work,Power & Energy Level: High School
(a) Explain what is meant by positive work and negative work done on an object in terms of the total mechanical energy of that object .(b) Does the work on an object by friction ever reduce the total internal energy of a system ? Explain .
Physics Work,Power & Energy Level: High School
A 2.0 kg block is projected down a plane that makes an angle of 20 degrees to the horizontal with an initial kinetic energy of 2.0 J .If the coefficient of kinetic friction between the block and the plane is 0.40 , how far will the block slide down the plane before coming to rest ? Applied the Work-Energy Theorem to solve . Consider the system to be the block , the plane , and Earth .
Physics Work,Power & Energy Level: High School
A surprising demonstration involves dropping an egg from a third floor window to land on a foam rubber pad 5 cm thick without breaking . If the 56 g egg falls 12 m and the foam pad stops the egg in 6.25 milliseconds . by how much work does the work exert on the egg in stopping it ? In your energy consideration consider the system to be the egg and the earth .