Apendulum of length l is suspended from the ceiling of an elevator. when the elevator is at rest the period of the pendulum is t. how does the period of the pendulum change when the elevator moves upward with constant acceleration?
a) the period decreases.
b) the period increases if the upward acceleration is more than g/2 but decreases if the upward acceleration is less than g/2. c) the period does not change.
d) the period becomes zero.
e) the period increases.

A)The period decreases.

Explanation:

Given that

Length of the pendulum = L

Time period = T ( at rest condition)

At rest condition only gravitational acceleration g act downward.

At rest

When acceleration will move upward with acceleration a ,then

Therefore we can say that time period of the pendulum will decrease ,because g+a is more than g.

what experimental evidence led scientists to change from the previous model to this one?

a few of the positive particles aimed at a gold foil seemed to bounce back.

the colors of light emitted from heated atoms had very specific energies.

experiments with water vapor showed that elements combine in specific proportions.

cathode rays were bent in the same way whenever a magnet was brought near them.