Question

This is to help people. in this question

The bob (weight) at the end of a pendulum has a mass of 0.3 kilograms. The bob is pulled to position B and allowed to swing. It goes all the way to position C and swings back.

The potential energy of the bob at position B is ____joules. If the maximum height of the bob is 0.45 meters when it swings back, ___joules of energy was transformed to thermal energy.
Use g = 9.8 m/s2 and PE = m × g × h.

so, if you have the picture on your screen then at the top you will see 0.5 as the height. So, to get the first answer your going to do 0.3(m)x9.8(g)x0.25(h). That will give you the answer. I wont say what it is cause you need to multiply it yourself and see how that works. And for the second part you do the same exact thing except instead of 0.25 its 0.45. I hope this helps you :)

Answer 1

Answer: 0.147 J

1.323 J

Step-by-step explanation:

The total energy that has been transformed into thermal energy is equal to the loss of gravitational potential energy between the initial situation (bob at h=0.5 m above the ground) and the final situation (bob back but at h=0.45 m above the ground).

m = 0.3 kg is the mass of the bob

g = 9.8 m/s^2

h1 = 0.5 m is the initial height

h2 = 0.45 m is the final height

Substituting, we find the thermal energy

0.37 kg x 9.8 m/s^2 x (0.5 - 0.45)m = 0.147 J

Therefore, the energy transformed into thermal energy is 0.147 J.

Credits - skyluke89

Answer 2

b

Step-by-step explanation: