Top answers

What happens to the pressure inside a sealed canister of gaseous oxygen when it is transferred from a cool environment to a warmer environment?

The pressure increases when it is moved from a cool environment to a warmer environment. This is because the molecules of oxygen have more kinetic energy in a warmer environment and therefore move faster. Th...
AC
Answered by Adam C. • Physics tutor
2225 Views

A wave with a constant velocity doubles its frequency. What happens to the wavelength?

The relationship between velocity, frequency and wavelength is given by: v=fλ. In this case, we have: v=fλ 1 and v=2 fλ 2 .Since the question states that the velocity is constant, we can write the equality: ...
TD
4044 Views

A car of mass 1000 kg is travelling at 20 (m/s). The car crashes into a tree, and comes to a complete halt in 0.05s. Calculate the force acting on the car during the collision.

We are asked for the force acting on the car and we know from Newton's second law that F = ma Therefore, we need to calculate the acceleration first. We use a = (vf - vo)/(t - to) where vf = final speed, vo ...
PM
Answered by Pablo M. • Physics tutor
3952 Views

What are the differences between sound waves and electromagnetic waves?

Propagation: Sound waves are longitudinal , meaning that the vibrations occur parallel to the direction of propagation (travel). Electromagnetic waves are transverse , meaning that the vibrations occur perpe...
WL
Answered by Wendy L. • Physics tutor
77502 Views

Explain the input and output energy sources for a car engine. How would you calculate the efficiency? Explain in terms of the inputs and outputs how the efficiency could be improved.

The input is chemical energy (in the form of fuel). The outputs areSound (not useful)Kinetic (useful)Heat (may be useful)The efficieny is given by useful output energy divided by total input (or output) ener...
SH
Answered by Samuel H. • Physics tutor
21241 Views