Before anyone can help you, if this is a multiple choice question you must provide the answers.<span />
you can find it using the equation: potential energy=mass*gravitational acceleration*height.
energy=50kg*9.8N/kg*40m=19600Nm=19600J or 19.6kJ
Sometimes they use 10 instead of 9.8 for the g constant.
Rember to make me Brainliest!!!
Thermal expansion<span> is the tendency of matter to change in shape, area, and volume in response to a change in temperature, through </span>heat<span> transfer. Temperature is a monotonic function of the average molecular kinetic energy of a substance. When a substance is heated, the kinetic energy of its molecules increases.so this can result in.......heat</span>
Answer:

Explanation:
Given:
- file size to be transmitted,

- transmission rate of data,

- propagation speed,

- distance of data transfer,

<u>Now the delay in data transfer from source to destination for each 10 Mb:</u>



<u>Now this time is taken for each 10 Mb of data transfer and we have 30 Mb to transfer:</u>
So,


