Hi there!
We can use the following equation for constant velocity:
d = displacement (m)
v = velocity (m/s)
t = time (s)
Plug in the givens:
Why did Archimedes shout eureka what did he find out?
1 answer:
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Answer:
80%
Explanation:
Thermal efficiency is a measure of the extent to which a heat engine is able to convert to other form. It is measure in percentage.
Thermal efficiency = × 100%
Where is the input energy and
is the output energy.
Given that: = 2400 J and
= 3000 J, therefore:
Thermal efficiency = × 100%
= 80%
The thermal efficiency of the engine is 80%.
Mass of the car = 1200 kg
Mass of the truck = 2100 kg
Total mass of car and truck = 2100 + 1200 = 3300 kg
Since, the car pushes the truck. Hence, they will move together and will have same acceleration.
Let the acceleration be a.
According to Newton's second law:
F(net) = ma
F = 4500 N
4500 = 3300 × a
a = 1.36 m/s^2
Let the force applied by the car on truck be F.
F = F(net) on the truck
F = ma
F = 2100 × 1.36
F = 2856 N
Hence, the force applied by the car on the truck is 2856 N