8 Energy – forces doing work

H

The table gives measurements for two motors.

Motor	Input power in W	Useful energy transferred in J	Time in s
X	250	1800	12
Y	300	2400	10

What is the ratio of the efficiency of Y to the efficiency of X?

[1]

$1.20$

$1.60$

$0.75$

$1.33$

H

The table gives measurements for two motors.

Motor	Input power in W	Useful energy transferred in J	Time in s
X	250	1800	12
Y	300	2400	10

What is the ratio of the efficiency of Y to the efficiency of X?

[1]

$1.20$

$1.60$

$0.75$

$1.33$

8 Energy – forces doing work Questions