An aluminum cube of mass 44.25 g, at 22.3°c, is immersed in a styrofoam cup filled with ln2 at -195.8° c. after 120 seconds (sec), 34.50 g of ln2 evaporates due to heat transferred from the cube. calculate lv of ln2 (in units of calories and grams) and the rate r (calories/second) at which heat from the cube evaporates ln2. (note that the 34.50 g evaporated is due solely to the immersion of the cube, and not by heat transferring into the cup from the room.) use the accepted value of cal (for this temperature range) when calculating lv. use your calculated value of lv when calculating the rate r. show formulas and calculations.

heats surface water up

statement #3 on andre"s list is false.

note: the given question is incomplete.

complete question is given below.

which is an example of kinetic energy?

a. the energy stored in ethanol  

b. a hockey puck sliding across the ice  

c. a compressed spring  

d. a ball sitting at the top of a ramp

solution: the kinetic energy is the energy posses by the virtue of the motion of the object.

in the given options, a, c and d are the example of potential energy because it is the energy posses by the virtue of the rest of the object. but option b has the kinetic energy as the object is in motion.

hence, a hockey puck sliding across the ice   is the apex example of kinetic energy.

so, the option (b) a hockey puck sliding across the ice   is the correct option.