Ted lifts a 10N weight at a height of 1.5 m in 1 second
Johnny lifts a 10N weight at a height of 1.5 m in
2 second
Which statements are correct?
A. Johnny and Ted did the same amount of
work
B. Ted did more work
C. Johnny and Ted expanded the same power
D. Ted expanded more power
E Johnny did more work
F. Johnny expanded more power

D. Ted expanded more power.

Explanation:

Given the following data;

For Ted.

Force = 10N

Height = 1.5m

Time = 1 seconds

To find Ted's power;

Power = workdone/time

But workdone = force * distance

Workdone = 10 * 1.5

Workdone = 15 Nm

Power = 15/1

Power = 15 Watts.

For Johnny.

Force = 10N

Height = 1.5m

Time = 2 seconds

To find Ted's power;

Power = workdone/time

But workdone = force * distance

Workdone = 10 * 1.5

Workdone = 15 Nm

Power = 15/2

Power = 7.5 Watts

Therefore, from the calculations we can deduce and conclude that Ted expanded more power.

5 w for 1hr = 5x60x60 joules=300x60=3000x6=18,000j as total energy conversion. efficiency of bulb needed for radiant to thermal within 18000