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Central force question?

Question about linear fictitious force, (link in the description)?

Question about water waves?

To 天同知識長.....?

help super urgent!!!!!!!!!!!!! physics about mirror?

One physics MC about refraction, one MC about transformer, please help?

Please help, why is the answer D? This is similar to the circuit question I asked before?

one MC about circuit concept?

Question about moment! please answer and help thanks?

Please help. One MC about wave and one about lens?

3 physics MC, Please help very urgent?

why is the half life 80s ? is this question wrong?

Is this solution wrong?

Confusions about electrons as a wave. (A bit long and stupid. Thanks you so much for taking time to see)?

Does work function in photoelectric changes with the voltage applied.?

Simple question about wiring an AC ammeter?

Question about gravitational force.?

Question about circular motion on a horizontal road?

A charge will experience a force when it travels in a magnetic field. By Newton 3rd law, what are the action and reaction pair?

Please prove that the lost of KE is the largest when it undergoes perfectly inelastic collision (stick together after collision)?

my book said the force "push of table" acting on a book at rest on the table is a type of electro-magnetic force. Please explain.?

Please verify the answer.(Magnetism)?

Re: EPE of a neutral object?

Please help. Big confusion about potential. Urgent.?

EPE of a neutral object?

Question about shuttle ball experiment. Very confused.?

Question about gold leaf electroscope.?

Question about electrostatics.?

I don't understand the answer of a) ,please explain what does p.d. drop increases mean.?

Question about current?

Please tell me if my approach to the answer is correct or not. The correct ans is E.?

Please explain about (3)?

How can electrons be absorbed by material of the object in TEM microscope?

Is this question wrong or impossible to answer? Why is the answer D?

(transformer) why does iron loss in core doesn't affect voltage but copper loss in winding affect voltage?

Re: photoelectrons having different speed.?

Question about x-ray, concept confusion?

Explain why photoelectrons have different speed while their incident photons have fixed energy.?

Why (3) is not correct?isn't infrared produced? Isn't black body radiation produced?

Re: the question of brightness?

Is brightness just related to the number of photons per time and independent of the photons' frequency?

why cant electrons be excited by fast moving protons?

How can nuclear fusion be uncontrolled? as there are no trigger like new nitrogens in fission?

Why does the sun have higher pressure in the core? Isn't the gravity increases linearly with the radius and highest pressure on the surface?

Why KEmax=hf-work function?

Physics. Why the water flow along the pipe will contribute pressure on the wall of the pipe which is parallel to the direction of flow?

Will the speed of an electron convert to mass when it is near light speed?

why cant heating speed up radioactivity rate?

Question about photoelectric effect?

Consider a set up with a power supply(dc voltage) and a photocell (metal plate + collector) and an ammeter. Frequency of light is constant.?