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Aug
27
accepted What is the relationship between radation intensity and count rate?
Aug
27
awarded  Scholar
Aug
26
asked What is the relationship between radation intensity and count rate?
Aug
12
revised Physical Quantities
improved grammar, spelling
Aug
12
suggested suggested edit on Physical Quantities
Jul
20
answered Basics of Current Electricity
May
11
answered Would adding water after heating decrease the overall heat, when compared to adding the water before heating for the same period of time?
May
3
comment Was Titanic's captain's decision correct?
@Floris Ah I see, sorry.
Apr
16
answered Protons (as opposed to neutrons) to mediate nuclear fission?
Apr
4
answered Energy, time and force
Apr
2
comment limited number of photons problem
Photons can come in and out of existence. They are not finite.
Mar
29
answered Rotational Velocity and Rotational Frequency
Mar
28
comment Can temperature be objectively related to energy?
I'm not sure if you are aware of the following relation: $\frac{1}{2}mv_{rms}^2=\frac{3}{2}kT$, but I think you will find it useful.
Mar
28
answered How much force is required to compress air?
Mar
28
comment Acceleration Power
It comes from $x=\frac{1}{2}(v_0+v_f)t$.
Mar
27
answered Acceleration Power
Mar
19
comment Why is force dependent on acceleration, not velocity?
@user2612743 To calculate the force in collisions you us the impulse divided by time, or $F_{net}=\Delta P/\Delta t$.
Mar
8
answered Force from solenoid
Mar
1
comment Why do speed skaters use their right hand to accelerate?
Try to sprint without moving your arms, the same principle applies to speed skating. Not only do you increase your balance, but you get extra momentum forward as well.
Feb
17
comment How electron movement produces current,instead of having a slow drift speed
The device is powered by the current produced by the moving charge. The electrons at the negative terminal have higher potential energy, given by $U=qV$. This does not mean that they 'magically' have more energy in the sense that they will make the (e.g. light bulb) shine more brightly. This is because they have lost that potential energy by the time they get to the electrical device. The power of the electrical device comes from the voltage times the current $P=VI$, both of which are established immediately once the circuit is closed.