One kilogram of chilled water (0°C) is placed in a freezer which is kept at 0°F (-18°C). Approximately how much electric energy (in kilocalories) is needed just to freeze the water if the room temperature is maintained at 75°F (24°C)? (Lice = 333 J/g; cice = 209 J/g×°C.)
a. 11
b. 15
c. 16
d. 13
e. 33
D
You might also like to view...
You press a stick that has a varying cross-sectional area horizontally between the palms of your hands. The area of the stick pushing against your left palm is twice the area of the stick pushing against your right palm.The force on your left palm is __________ the force on your right palm
Fill in the blank(s) with correct word
A cable with known tension force T is anchored at C and passes over a frictionless drum (see figure). The pin force components Bx and By (in terms of cable force variable T) for the pin connection at B are:
(A) 2T, 2T
(B) 22T, T
(C) 2T, 2T
(D) 2T, 3T/2
___________ is (are) observed when light from a distant quasar travels past a massive galaxy between us and the quasar, and this light is focused to form two or more images of the same quasar
a. A double-lobed radio galaxy b. Superluminal expansion c. The gravitational lens effect d. A blazar e. Gravitational waves
The minimum sound intensity that can be detected by the human ear is called the ______________ of hearing
Fill in the blank(s) with correct word