Conceptual Physics
Section 22 - Interactive problem: forces on a sliding block 22.1 Using the simulation in the interactive problem in this section ...
24.2 A tennis ball of mass 57.0 g is dropped from the observation deck of the Empire State building (369 m). The tennis ball has ...
6.0 - Introduction The use of energy has played an important role in defining much of human history. Fire warmed and protected o ...
All the force need not be in the direction of the displacement. When the force and displacement vectors are not in the same dire ...
Now the woman is pulling the crate at an angle. If she does the same amount of work as before, how much force must the woman exe ...
Third, energy can change forms. When water falls over a dam, its energy of position becomes the energy of motion (kinetic energy ...
What is the kinetic energy of the arrow? KE = ½ mv^2 KE = ½(0.015 kg)(5.0 m/s)^2 KE = 0.19 J 6.5 - Work-kinetic energy theorem W ...
Work-kinetic energy theorem W = ǻKE W = net work KE = kinetic energy What is the soccer ball’s speed immediately after being kic ...
Variables What is the strategy? Calculate the change in kinetic energy of the sled, using the sled’s mass and its initial and f ...
6.7 - Interactive problem: work-kinetic energy theorem In this simulation, you are a skier and your challenge is to do the corre ...
Equation 2 shows two other useful equations for power. Power can be expressed as the rate of change of energy, as you see in the ...
Applying a force of 2.0×10^5 N, the tugboat moves the log boom 1.0 kilometer in 15 minutes. What is the tugboat’s average power? ...
Change in gravitational potential energy ǻPE = mgǻh PE = potential energy mg = object’s weight ǻh = vertical displacement Gravit ...
6.11 - Work and gravitational potential energy Potential energy is the energy of a system due to forces between the particles or ...
6.12 - Sample problem: potential energy and Niagara Falls Variables What is the strategy? Use the definition of power as the ra ...
6.13 - Interactive checkpoint: an elevator An elevator with a mass of 515 kg is being pulled up a shaft at constant velocity. It ...
What is the cannonball’s velocity at 125 m? Its mass is 3.20 kg. W = ǻPE + ǻKE W = mgǻh + ǻKE 12,500 J = (3.20 kg)(9.80 m/s^2 )( ...
force is path independent. However, with non-conservative forces, the path does influence the amount of work done by a force. Co ...
and so on. The amount of mechanical energy does decline, but when you include all forms of energy, the overall energy stays cons ...
Step-by-step solution We start by stating the law of conservation of energy in equation form, and then adapting it to fit the sp ...
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