Physics Work,Power & Energy Level: High School
Consider the incline plane with friction shown in the figure at “click here” , Calculate the velocity of the block at the bottom of the plane using the force analysis , and then calculated using the work-energy concept .
Physics Work,Power & Energy Level: High School
Using the work energy concept determine the velocity of a block sliding down a frictionless incline plane . The velocity at the bottom of the plane is related to a specific height H, from which the block fell . Calculate the velocity . Remember we assume that the block and the ground below are frictionless .Now take into consideration friction . The friction coefficient is .30 . How far will the block travel past the incline taking into account friction ?
Physics Work,Power & Energy Level: High School
Calculate the work performed by a constant force of 80 N pushing a block a distance of 6 m along a horizontal surface at 40 degrees ,
Physics Work,Power & Energy Level: High School
During one completer cycle, an engine receives 690 J o heat from a hot reservoir and give off 430 J of heat to a cold reservoir, What is the efficiency of the engine ?
Physics Work,Power & Energy Level: High School
A swimmer does 6.7*10^6 J of work and gives off 4.1*10^5 J of heat during a workout . Including the appropriate algebraic sigh (+ or -) , determine , for the swimmer :a. The change in internal energy .
b. The work .
c. The heat .
Physics Work,Power & Energy Level: High School
How many kilometer per liter will a obtain if its engine is 25 percent efficient and it encounters and average force of 1000 newtons ? Assume the energy content of gasoline is 40,000,000 joules per liter (J/L) .
Physics Work,Power & Energy Level: High School
If you push a lawn mower across a yard in 10 seconds, how does the work done compare with pushing it across the same yard in 20 seconds ? Explain why ?(b) How does the power for 10 seconds compare to the power for 20 seconds ?
Physics Work,Power & Energy Level: High School
What various forms of energy are present as you shoot a bow and arrow ?
Physics Work,Power & Energy Level: High School
If a sprinter running at a speed of 10 meters per second could convert his/her kinetic energy into upward motion . how high could he/she jump ?
Physics Work,Power & Energy Level: High School
As you catch a fast-moving fastball , why is it wise to move your hand in the direction of the ball’s motion ? Explain in terms of work and energy .
Physics Work,Power & Energy Level: High School
A 1000 kilogram car is lifted 1 meter .a. What is the potential energy with respect to the floor ?
b. If the car is lifted 2 meters high, what is the new value of potential energy with respect to the floor ?
c. Explain the following : Potential energy of an object varies linearly with position (height) .
Physics Work,Power & Energy Level: High School
Explain the difference between energy and power and how they are related to work . Give example of each
Physics Work,Power & Energy Level: High School
A skier weighing .8kN comes down a frictionless ski run that is circular (R = 30 m) at the bottom as shown in the figure at “click here” . If her speed is 12.0 m/s at point A , What is her speed at point B .
Physics Work,Power & Energy Level: High School
A force F = (3.00 N) i +(7.00 N) j + (7.00 N ) k acts on a 2.00 kg mobile object that moves from an initial position of di = (3.00 m) i – (2.00 m) j + (5.00 m) k to a final position of df = -(5.00 m) I + (4.00 m) j + (7.00 m) k in 4.00 s . Find(a) The work done on the object by the force in the 4.00 s interval
(b) The average power due to the force during that interval(c) The angle between vectors di and df .
Physics Work,Power & Energy Level: High School
A 0.30 kg ladle sliding on a horizontal frictionless surface is attached to one end of a horizontal spring (k = 500 N/m)_ whose other end is fixed . The ladle has a kinetic energy of 10 J as it passes through its equilibrium position (the point at which the spring force is zero).(a) At what rate is the spring doing work on the ladle as the ladle passes through its equilibrium position .
(b) At what rate is the spring doing work on the ladle when the spring is compressed 0.10 m and the ladle is moving away the equilibrium position ?