Power = energy / time
Multiply each side by 'time', then
divide each side by 'power':
Time = energy / power
Time = 432 / 75 = <em>5.76 seconds</em>
The operating coefficient or performance coefficient of a heat pump is the ratio between the heating or cooling provided and the electricity consumed. The higher coefficients are equivalent to lower operating costs. The coefficient can be greater than 1, because it is a percentage of the output: losses, other than the thermal efficiency ratio: input energy. Mathematically can be written as,
Replacing,
Therefore the heat is 3.822kJ
Answer: The answer is A) 49 N(Newtons).
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Below is the solution:
<span>centripetal accel = 1.5*g
ω²r = 1.5*9.8m/s²
ω² * 8m = 14.7 m/s²
ω = 1.36 rad/s * 1rev/2πrads * 60s/min = 12.9 rpm</span>
Answer:
Twice the work needed to lift the 20cm object
Explanation:
Work done is derived using the expression below;
Work done = Force x distance
For this problem, we are lifting through a vertical height;
Work done = mg x h
mg is the weight of the body;
Since both bodies have the same weigh;
W1 is the workdone to lift 20cm
W2 is the workdone to lift 40cm
For the first lift;
W1 = (mg) x 20cm
(mg) =
For the second lift;
W2 = (mg) x 40cm
Since they both have the same weight
(mg) =
Equating the two weights;
=
20W2 = 40W1
W2 = = 2W1