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You are sitting in a boat on a lake, you have with you in the boat a large rock. You throw the rock out of the boat and it sinks to the bottom of the lake, does the water level of the lake go up, down or stay the same?

Whilst in the boat the rock (and you) are floating, this means that the amount of water displaced by the rock is the mass of the rock. When the rock sinks to the bottom of the lake the amount of water displa...
JB
Answered by Jonathan B. • Physics tutor
10600 Views

What is the difference between electromotive force and potential difference?

The electromotive force and the potential difference in a circuit are very similar concepts as they are both names for energy per unit charge within a circuit and they both use the same unit, Volts. The diff...
CL
Answered by Caillan L. • Physics tutor
28734 Views

Electrons are accelerated through a potential difference of 300 V. What is their final de Broglie wavelength?

The kinetic energy of the electron will be equal to the energy what the electric field gives to it.1/2 m v 2 =V QFrom thisv=sqrt(2 V Q/m) De Broglie wavelength:lambda=h/p=h/(mv) We know that h is the planck ...
CB
Answered by Csaba B. • Physics tutor
9733 Views

Explain how resonance occurs for a driven oscillating system and describe the effect of damping on the resonant frequency.

When the driving force occurs at the natural frequency of the system (the natural frequency being the frequency if the system were oscillating freely) there is maximum energy transfer to the system causing t...
SK
Answered by Saaras K. • Physics tutor
3755 Views

Define the work function of a metal

The minimum energy required by an electron to escape from a (metal) surface
GR
Answered by George R. • Physics tutor
4404 Views