The distance of a person is 50Km and displacement of a person is 25Km.
<h3>What is the difference between displacement and distance? </h3>
The complete length of the path between any two points is called Distance and the shortest distance covered by an individual is called displacement . Distance can Never be negative and zero or cannot be less than displacement but displacement can be 0, negative and it is always less than or equal to magnitude of ditance. Displacement is vector quantity and distance is scalar quantity.
Person has covered total distance 50Km and displacement is 25km because it travels 25 km west and then comes to zero while walking towards east.
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C
The temperature must go up if the piston remains stationary.
Explanation:
1
.
The temperature must go up if the piston remains stationary
If the piston remains stationary, we know that
Δ
V
, the change in volume of the system, is necessarily zero, i.e.
Δ
V
=
0
.
This implies that the system does no work on the environment as it does not expand.
Remark
It's not the number that's the problem. It's the minus sign.
Just use F = m*a to get the numerical answer. F = 51 * 11 = 561 N
Now we come to the hard part. If you learn nothing else in physics, you learn that minus signs are either your best buddy or your worst enemy -- one that you pay a mafia hit man a lot of money to get rid of.
In this case, you better start looking for a guy wearing a white tie.
What you are finding is a force that is acting against the starting block. In order to move forward, you have to push against something to accomplish going forward. That's why the block is there: it absorbs the push and you pop forward. You should draw a diagram of the block so you see how many forces act on it.
Answer: - 561
A, and D are two correct answers im not sure about the third sorry
Answer
A. the work done on the refrigerant in each cycle is 105kJ
B the coefficient of performance of the refrigerator is 4.8
Explanation
Given data
Work done at high temperature T2 Qh=610kJ
Work done at low temperature T1 Ql=505kJ
We know that the net work done by the refrigerator is expressed as
Wnet= Qh-Ql
=610-505
=105kJ
Also we know that the coefficient of performance is expressed as
COP= Ql/Wnet
COP= 505/105
= 4.8