In the 121 m tall waterfall shown, Robinson climbs to the top, carrying his 71 kg body with him. If he then slides down, what should be his speed at the bottom? Would he be going faster if the waterfall was in one tier instead of two? (Ignore friction).

Two particles of masses m and 2m are placed on a smooth horizontal table. a string, which joins these two masses, hangs over the edge supporting a pulley, which suspends a particle of mass 3m. the pulley has negligible mass. the two parts of the string on the table are parallel and perpendicular to the edge of the table. the hanging parts of the string are vertical. find the acceleration of the particle of mass 3m.

If you touch a hot light bulb and get burned, that is an example of a. radiation b. convection c. conduction

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