Answer:
Efficiency = 52%
Explanation:
Given:
First stage
heat absorbed, Q₁ at temperature T₁ = 500 K
Heat released, Q₂ at temperature T₂ = 430 K
and the work done is W₁
Second stage
Heat released, Q₂ at temperature T₂ = 430 K
Heat released, Q₃ at temperature T₃ = 240 K
and the work done is W₂
Total work done, W = W₁ + W₂
Now,
The efficiency is given as:
or
Work done = change in heat
thus,
W₁ = Q₁ - Q₂
W₂ = Q₂ - Q₃
Thus,
or
or
also,
or
thus,
thus,
or
or
Efficiency = 52%
Answer:
3- A ball of mass 0,50 kg falls and hits the floor at 10m/s,
It rebounds at speed 8.0 m/s, as shown.
before collision
after collision
10 m/s
8 m/s
The collision between the ball and the floor lasts for 0.50 s.
What is the average force acting on the ball during the collision?
Answer:
D
D
C
C
Explanation: BRAINLIEST ME
Answer:
1.78 m upward
Explanation:
We can find the displacement of the volleyball by using the SUVAT equation:
where, assuming upward as positive direction:
u = 6.0 m/s is the initial velocity
v = 1.1 m/s is the final velocity
a = g = -9.8 m/s^2 is the acceleration of gravity
d is the displacement
Solving the equation for d, we find:
And since it is positive, the displacement is upward.
