Work requires
a. motion.
b. zero net force.
c. zero momentum.
d. a force perpendicular to the direction of motion.
a
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Calorimetry: An 920-g piece of iron at 100°C is dropped into a calorimeter of negligible heat capacity containing 50 g of ice at 0°C and 92 g of water, also at 0°C. What is the final temperature of the system? The specific heat of iron is 448 J/kg ? K, that of water is 4186 J/kg ? K, and the latent heat of fusion of water is 33.5 × 104 J/kg.
A. 0°C B. 11°C C. 14°C D. 24°C E. 32°C
So which is closer?
A: Menkent B: Hadar C: Can't tell
A particle with a mass of 400 g moving at 2.0 m/s collides elastically with a stationary particle whose mass is 240 g. After the collision, the 400 g mass is moving at 1.5 m/s. Through what angle is its path deflected?
A) 35° B) 15° C) 25° D) 30° E) 20°
Observations of Type Ia supernova indicate that the universe is static
a. True b. False Indicate whether the statement is true or false