sebongkah es dengan massa 200 gram memiliki suhu -5 c. jika es tersebut ingin diubah menjadi air yang bersuhu 20 c, berapakah kalor yang harus diberikan? (kalor jenis air = 4200 J/kg, kalor jenis es = 2100 J/kg, dan kalor lebur es = 336 KJ/kg)

Explanation:

m = Massa es = 200 g

= Kalor jenis air =

= Kalor jenis es =

= Kalor laten fusi es =

= Perubahan suhu air =

= Perubahan suhu es =

Panas yang dibutuhkan diberikan oleh

Panas yang dibutuhkan untuk mencairkan es hingga suhu air yang dibutuhkan adalah

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.