College Physics

Problems & Exercises 6.1 Rotation Angle and Angular Velocity 1.Semi-trailer trucks have an odometer on one hub of a trailer ...

(b) Draw a free body diagram of the forces acting on a rider at the bottom of the arc. (c) Find the force exerted by the ride on ...

Figure 6.37(a) NASA centrifuge used to subject trainees to accelerations similar to those experienced in rocket launches and ree ...

38.Solve part (b) ofExample 6.6usingac=v^2 /r. 39.Astrology, that unlikely and vague pseudoscience, makes much of the position o ...

7 WORK, ENERGY, AND ENERGY RESOURCES Figure 7.1How many forms of energy can you identify in this photograph of a wind farm in Io ...

Conservation of energy(as physicists like to call the principle that energy can neither be created nor destroyed) is based on ex ...

Figure 7.2Examples of work. (a) The work done by the forceFon this lawn mower isFdcosθ. Note thatFcosθis the component of the fo ...

generator does negative work on the briefcase, thus removing energy from it. The drawing shows the latter, with the force from t ...

work done is(Fcosθ)i(ave)difor each strip, and the total work done is the sum of theWi. Thus the total work done is the total ar ...

(7.9) Wnet=m ⎛ ⎝ ⎜ v^2 −v 02 2 d ⎞ ⎠ ⎟d. Thedcancels, and we rearrange this to obtain W=^1 (7.10) 2 mv^2 −^1 2 mv 0 2. This expr ...

This is a motion in one dimension problem, because the downward force (from the weight of the package) and the normal force have ...

Thus, 1 (7.23) 2 mv^2 = 92.0 J+3.75 J = 95.75 J. Solving for the final speed as requested and entering known values gives (7.24) ...

Converting Between Potential Energy and Kinetic Energy Gravitational potential energy may be converted to other forms of energy, ...

Figure 7.6The change in gravitational potential energy(ΔPEg)between points A and B is independent of the path.ΔPEg=mghfor any pa ...

a force 100 times smaller than in the example. A kangaroo's hopping shows this method in action. The kangaroo is the only large ...

Solving forv, we find that mass cancels and that v= 2g∣h∣. (7.36) Substituting known values, (7.37) v = 2⎛⎝ 9 .80 m/s^2 ⎞⎠(20.0 ...

7.4 Conservative Forces and Potential Energy Potential Energy and Conservative Forces Work is done by a force, and some forces, ...

Figure 7.11Work is done to deform the guitar string, giving it potential energy. When released, the potential energy is converte ...

Figure 7.12A toy car is pushed by a compressed spring and coasts up a slope. Assuming negligible friction, the potential energy ...

PhET Explorations: Energy Skate Park Learn about conservation of energy with a skater dude! Build tracks, ramps and jumps for th ...