Search our library of Physics A Level questions

Top answers

Physics

A Level

State assumptions made about the motion of the molecules in a gas in the derivation of the kinetic theory of gases equation.

The molecules move in random motion. Collisions of molecules with each other and with the walls are elastic (total kinetic energy stays constant). Time in contact is small compared with time between colli...

Answered by Marina J. • Physics tutor

5928 Views

Why do atoms larger than iron release energy when they undergo fission?

For this problem we need to consider the strong nuclear force (SNF), and the electromagnetic force (EMF). Recall that the SNF attracts very strongly over very small distances (≈10^-15m), and the...

Answered by Henry B. • Physics tutor

2414 Views

2 Capacitors (c1 = 500mf) and (c2=300mf), are connected in parallel to a 10v d.c supply. Calculate the total capacitance of the circuit, and hence the total energy stored in the capacitors.

Use the equation Ct = C1 + C2, 500mF + 300mF = 800mF or 800x10^-3F
2) Appropriate equation is W=1/2 V^2 C
W = (0.5)*(10^2)*800^-3 = 40J

Answered by Samuel M. • Physics tutor

2004 Views

How would you calculate the moment of a Force on a rigid object?

You would calculate the moment of a force on a object by first finding the distance of the force from the pivot point of the object. Following this, you would find the component of the force perpendicular...

Answered by Nathan S. • Physics tutor

2296 Views

A linear accelerator (LINAC) is used to accelerate protons at CERN before they are injected into the Large Hadron Collider. Explain with the aid of a diagram how the proton is accelerated by the LINAC.

A linear accelerator is built with several drift tubes that increase in length, at either end of each tube are electrodes that provide an alternating current. As a proton is a positively charged particle ...

Answered by Emma B. • Physics tutor

4803 Views