The longer the wavelength, the bluer and brighter the star appears
a. True
b. False
Indicate whether the statement is true or false
False
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A person makes ice tea by adding ice to 1.8 kg of hot tea, initially at 80°C. How many kilograms of ice, initially at 0.00°C, are required to bring the mixture to 10°C?
The heat of fusion of ice is 334 kJ/kg, and we can assume that tea has essentially the same thermal properties as water, so its specific heat is 4190 J/(kg?K). A) 1.4 kg B) 1.2 kg C) 1.5 kg D) 1.0 kg E) 1.7 kg
An 80-km/h airplane flying in the same direction as a 10 km/h tail wind has a groundspeed of
A) 10 km/h. B) 70 km/h. C) 80 km/h. D) 90 km/h.
Coal reserves in the United States are expected to last for
A. hundreds of years B. three or four decades C. 72 years D. less than a decade
Two long parallel wires carry currents of 20 A and 5.0 A in opposite directions. The wires are separated by 0.20 m. What is the strength of the magnetic field midway between the two wires? (?0 = 4? × 10-7 T ? m/A)
A) 2.0 × 10-5 T B) 3.0 × 10-5 T C) 1.0 × 10-5 T D) 4.0 × 10-5 T E) 5.0 × 10-5 T