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 > > 1.47 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.< < < < <

it's not 1.!

0.147 J

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).

Therefore, we have

where

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

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

false.

explanation:

this statement is false. after falling for 5 seconds, its speed will not be 100 m/s.