Answer: A Net Force is where two forces that are acting on an object are equal, but in opposite directions.
A car driving at a constant speed around a circular track
Answer:
75 km/h
Explanation:
Speed = Distance divided by Time.
The train went a distance of 300 km in 4 hours. Therefore, the speed of the train is: 300 divided by 4 = 75 km/h
Answer:
The net change in the internal energy of the gas in the piston is -343J
Explanation:
Because heat and workdone are the only means of energy transfer between the system and the surrounding, change in internal energy is given by;
∆E = q + w
q = heat transfer
w = workdone
Because heat is lost by the system, the heat transfer is negative
q = -413J
Because work is done on the system, workdone is positive
w = +70J
∆E = -413J + 70J
∆E = -343J
Answer:
3
Explanation:
half life, T = 12 million years
total life, t = 36 million years
Let n be the number of half lives.
n = Total life / half life
n = 36 / 12 = 3
So, the number of half lives are 3.
