FIGURE 8-5 A 2.0-g bead slides along a wire, as shown in Figure 8-5. At point A, the bead is at rest. Neglect friction and use g = 10 m/s 2 .
-Refer to Figure 8-5. What is the potential energy of the bead at point A?

Question

FIGURE 8-5  A 2.0-g bead slides along a wire, as shown in Figure 8-5. At point A, the bead is at rest. Neglect friction and use g = 10 m/s 2 .
-Refer to Figure 8-5. What is the potential energy of the bead at point A?

Quizplus · Accepted Answer

The potential energy of the bead at point A is equal to the work done to raise the bead from point B to point A. The work done is equal to the force of gravity acting on the bead multiplied by the distance the bead is raised. The force of gravity acting on the bead is equal to its mass multiplied by the acceleration due to gravity. The distance the bead is raised is equal to the height of the track at point A minus the height of the track at point B. The mass of the bead is 0.10 kg, the acceleration due to gravity is 9.8 m/s^2, the height of the track at point A is 0.20 m, and the height of the track at point B is 0.10 m. Therefore, the potential energy of the bead at point A is equal to:PE = F * d = (m * g) * (hA - hB) = (0.10 kg * 9.8 m/s^2) * (0.20 m - 0.10 m) = 0.02 J = 2.0 x 10^-2 J

FIGURE 8-5 a 2