Answer:
Kinetic energy
Explanation:
When a pendulum is swinging about its mean position, the total energy is conserved.
At the mean position, the kinetic energy is maximum but the potential energy is zero.
At the extreme position, the potential energy is maximum but the kinetic energy is zero.
Answer:
F = 4.8 N
Explanation:
Given that,
Mass of the curtain, m = 1.2 kg
Acceleration of the pull, a = 4 m/s²
We need to find the force she exerts on the curtain.
We know that,
F = ma
Put al the values,
F = 1.2 kg × 4 m/s²
= 4.8 N
So, the force is 4.8 N.
Answer:
increases by a factor of 
Explanation:
First we need to find the initial velocity for it to stop at the distance 2d using the following equation of motion:
where v = 0 m/s is the final velocity of the package when it stops, 
is the initial velocity of the package when it, a is the deceleration, and 
is the distance traveled.
So the equation above can be simplified and plug in Δs = d, 
for the 1st case
(1)
For the 2nd scenario where the ramp is changed and distance becomes 2d, 
(2)
let equation (2) divided by (1) we have:
So the initial speed increases by . If the deceleration a stays the same and time is the ratio of speed over acceleration a
The time would increase by a factor of
