Some doctors measure blood pressure by using a mercury manometer. Blood pressure varies by 5.6 kPa as a heart beats. The density of mercury is 14000 kg/m³ and the gravitational field strength g is 10 N/kg. What is the change in the height difference between the levels in the manometer during a heartbeat?

A wooden trapdoor is hinged along one side and, when closed, is supported on the other side by a ledge. When the trap…

Which part of the graph shows the limit of proportionality for an elastic solid?

Five blocks have the same mass but different base areas. They all rest on a horizontal table. A graph is plotted to s…

To charge an isolated metal sphere by induction, the following four processes are required. P The sphere is earthed b…

The potential difference (p.d.) across a 10Ω resistor is 5V. How much charge passes through the 10Ω resistor in 30 se…

Which changes both cause a decrease in the resistance of a copper wire?