The original cloud from which the Sun and planets formed had a composition rich in hydrogen and helium
a. True
b. False
Indicate whether the statement is true or false
True
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A 400-g piece of metal at 120.0°C is dropped into a cup containing 450 g of water at 15.0°C. The final temperature of the system is measured to be 40.0°C
What is the specific heat of the metal, assuming no heat is exchanged with the surroundings or the cup? The specific heat of water is 4190 J/(kg?K). A) 1470 J/(kg ? K) B) 2830 J/(kg ? K) C) 3420 J/(kg ? K) D) 3780 J/(kg ? K) E) 4280 J/(kg ? K)
Conversion of Units: An American football field, including end zones, is 360 feet long and 160 feet wide. If you needed to describe it for someone in Europe using the metric system, which one of the following quantities would be closest to its area in square meters? (2.54 cm = 1.00 in.)
A. 4920 m2 B. 5350 m2 C. 88.0 m2 D. 12,100 m2 E. 13,200 m2
Calculate the current through a 10.0-m long 22-gauge nichrome wire with a radius of 0.321 mm if it is connected across a 12.0-V battery. The resistivity of the nichrome is 1.00 × 10-6 ? ? m
A) 30.9 A B) 61.8 A C) 0.776 A D) 0.388 A
What would Earth's average surface temperature be if it had no greenhouse effect?
A) below the freezing point of water B) slightly above the freezing point of water C) about 10°C D) the same temperature as it is with the greenhouse effect E) slightly warmer than it is with the greenhouse effect