Answer:
Explanation:
efficiency of carnot engine operating between 1100 K and 320 K
= 1100 - 320 / 1100
= .709
efficiency of heat engine = 120 / 400 = .30
2 nd law thermal efficiency of heat engine = .30 x 100 / .709
= 42.31 % .
Answer:
Sun, fireflies, glow worms ,Stars ,a lighter torch ,a kerosene Oil Lamp, burning candle, vapor light, a bulb
Answer:
7.9m/s
Explanation:
we need to convert the given values to metres and seconds
3/2km = 1500m and 3.5min = 210s
Using the first key equation of accelerated motion:
d = ((vi+vf)/2) x t
1500m = ((6.4+vf)/2) x 210 (plug in values)
3000m = (6.4 + vf) x 210 (get rid of the denominator by multiplying both sides by 2)
14.29 = 6.4 + vf (divide both sides to get rid of time)
vf = 7.885 m/s (subtract 6.4 from the right side to isolate vf)
2 significant digit answer is 7.9m/s
To answer this question, we must bear in mind the following considerations that are mentioned in the statement:
The cannon balls are identical and shoot with the same force
The force acting on the cannonball increases with the length of the hole.
You want to know which cannon will have the least momentum on the ball.
Then, the force on the ball increases as the barrel length increases and the impulse depends on the magnitude of the force, then, the cannon that will have the minimum impulse will be the 1 meter one.
The answer is option B.
