1 isla thanks for your help and I hope you are feeling 44356
Answer:
The change in gravitational potential energy is 45 J.
Explanation:
Given that,
Mass = 3 kg
Distance = 1.5 m
Gravitational field strength = 10 N/kg
We need to calculate the change in gravitational potential energy
Using formula of gravitational potential energy
Put the value into the formula
Hence, The change in gravitational potential energy is 45 J.
The speed of the ball is always zero and the acceleration is always -g when it reaches the top of its motion. This is because when the ball is free, only gravity acts on it which is always downwards, hence g is the net acceleration and it is always negative. However the velocity does not direction change instantly, negative acceleration first slows down the ball with a positive velocity, until that point the ball keeps moving up, then the ball velocity becomes zero just before changing direction and becoming negative after which the ball will now go down along gravity. Hence the ball velocity is zero at the top (neither going up nor down). Mathematically this can be seen as velocity is the integration of acceleration.
First reason is safety, of course.
Second reason, the hot object radiates heat in the form of convection current which will heat the air around it.
This current can cause instabilities in measurements especially when using sensitive digital scales.
This force on compass dials is an example of a force that acts at a distance. (A compass doesn't need to touch the molten core of the Earth in order to work correctly.)
