A. How many joules of energy does a 100-watt light bulb use per hour?
i got the answer to be 3.60*10^5J
but i need help with part B
B.How fast would a 67.0kg person have to run to have that amount of energy?
2007-03-05 12:54:34 · 3 answers · asked by ♡♥EM♡♥ 4 in Science & Mathematics ➔ Physics
Kinetic energy is 1/2 m v^2.
Since you have already worked out the 360000 J part, all that is needed is to use this in the equation.
360000 =1/2 67 v^2
10746 = v^2
v= 103.664 m/s
That is 10 times faster that 100 m dash runners at the Olympics.
2007-03-05 13:08:14 · answer #1 · answered by Vincent G 7 · 0⤊ 0⤋
100 watts times 3600 seconds= 360 000 joules, so your answer is correct. To have that much kinetic energy, a 67kg person would need to run at 104metres a sec., which is 373 km./hr.
2007-03-05 13:03:20 · answer #2 · answered by zee_prime 6 · 0⤊ 0⤋
O GREBO
2007-03-08 02:04:40 · answer #3 · answered by fitzy a 1 · 0⤊ 0⤋