Author Question: A water pump draws about 4.4 A when connected to 240 V. What is the cost (with electrical energy at ... (Read 42 times)

fnuegbu · **on:** Jul 28, 2018

A water pump draws about 4.4 A when connected to 240 V. What is the cost (with electrical energy at 9 cents per kWh) of running the pump for 10 h?
a. 82 cents
c. 95 cents
b. 8.0 cents
d. 15 cents

Question 2

A ventilation fan with a moment of inertia of 0.034 kgm2 has a net torque of 0.11 Nm applied to it. If it starts from rest, what angular momentum will it have 9.0 s later?
a. 0.88 kgm2/s
c. 2.0 kgm2/s
b. 0.99 kgm2/s
d. 3.25 kgm2/s