Conservation of energy: question 1
a 0.1 kg popper is placed on a table. when it pops up, it reaches a
height of 2.0 meters. what was the initial velocity of the popper off the
table?

What type of light does this light bulb produce most (i. e. at what wavelength does the spectrum have maximum intensity)?

Determine the fraction of the magnitude of kinetic energy lost by a neutron (m1 = 1.01 u) when it collides head-on and elastically with a target particle at rest which is 21h (heavy hydrogen, m = 2.01 u).

Does anyone know how to solve this problem? i really need . i made an attempt but i just cant get it. a metal rod is 25.000 cm long at 25.0 degrees celsius. when heated to 102.0 degrees celsius, it is 25.054 cm long. what is the coefficient of linear expansion for this metal.