Physics quick practice

Question 1 of 10

A force of 20 N is needed to slide a box whose weight is 100 N at steady speed. What is the coefficient of friction?

Question 2 of 10

A fuse should be connected in the

Question 3 of 10

The cost of using a 2 kW heater for 5 hours at GH¢1.50 per kWh is

Question 4 of 10

Three capacitors of 2 μF, 3 μF and 6 μF are connected (a) in series, (b) in parallel, across a 12 V supply. For each arrangement calculate the total capacitance and the total charge stored.

Question 5 of 10

Astronauts in orbit feel weightless because there is no gravity there.

Question 6 of 10

Which electromagnetic wave has the longest wavelength?

Question 7 of 10

Find the power dissipated in a 60 Ω resistor connected across 12 V.

Question 8 of 10

The wave equation is

Question 9 of 10

Heat transfer through a vacuum occurs only by

Question 10 of 10

Specific latent heat of vaporisation is the heat needed to