107 grams of liquid water are in a cylinder with a piston maintaining 1 atm (101325 pa) of pressure. it is exactly at the boiling point of water, 373.15 k. we then add heat to boil the water, converting it all to vapor.

the molecular weight of water is 18 g/mol and the latent heat of vaporization is 2260 j/g.

1) how much heat is required to boil the water?

2) assume that the liquid water takes up approximately zero volume, and the water vapor takes up some final volume vf. you may also assume that the vapor is an ideal gas. how much work did the vapor do pushing on the piston?

3) how much did the water internal energy change?

Ablock of mass m = 2.5 kg is attached to a spring with spring constant k = 710 n/m. it is initially at rest on an inclined plane that is at an angle of θ = 23° with respect to the horizontal, and the coefficient of kinetic friction between the block and the plane is μk = 0.19. in the initial position, where the spring is compressed by a distance of d = 0.16 m, the mass is at its lowest position and the spring is compressed the maximum amount. take the initial gravitational energy of the block as zero. a) what is the block's initial mechanical energy? b) if the spring pushes the block up the incline, what distance, l, in meters will the block travel before coming to rest? the spring remains attached to both the block and the fixed wall throughout its motion.

Chameleons catch insects with their tongues, which they can rapidly extend to great lengths. in a typical strike, the chameleon's tongue accelerates at a remarkable 220 m/s2 for 20 ms, then travels at constant speed for another 30 ms.

Which of the following statement is false