The heat of fusion for ice at 0
is 333.7 kJ/kg, the specific heat of water 4.186 kJ/kg 
and the heat of vaporization of water at 100
is 2,256 kJ/kg. What is the energy needed to vaporize 100 grams of ice at starting at 0
?
A. 600 kJ
B. 500 kJ
C. 400 kJ
D. 300 kJ
E. 200 kJ
D. 300 kJ
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Bats can detect small objects such as insects that are of a size approximately that of one wavelength. If bats emit a chirp at a frequency of 60 kHz, and the speed of sound in air is 340 m/s, what is the smallest size insect they can detect?
What will be an ideal response?
What is 34 + (3 ) × (1.2465 ) written with the correct number of significant figures?
A) 37.74 B) 37.7395 C) 38 D) 37.7 E) 4 × 101
Two radio antennas are 120 m apart on a north-south line, and they radiate in phase at a frequency of 3.4 MHz
All radio measurements are made far from the antennas. If the east-west reference line passes midway between the two antennas, what is the smallest angle from the antennas, measured north of east, at which constructive interference of two radio waves occurs? (c = 3.00 × 108 m/s) A) 30° B) 47° C) 43° D) 68° E) 22°
What happens in the radiative zone?
What will be an ideal response?