What horizontally-applied force will accelerate a 400-kg crate at 1 m/s2 across a factory floor against a friction force half its weight?
A) 600 N
B) 1600 N
C) 2000 N
D) 2400 N
E) none of the above
Answer: D
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In an experiment to measure the thermal conductivity of a certain material, a slab of material 10.0 mm thick separates a steam chamber from a block of ice with a square cross-section of 8.00 cm × 8.00 cm
In 5.00 minutes of running the experiment, 64.0 g of ice have melted. What is the coefficient of thermal conductivity of this material? The latent heat of fusion of water is 33.5 × 104 J/kg. A) 0.130 W/m/K B) 0.250 W/m/K C) 0.440 W/m/K D) 0.620 W/m/K E) 1.10 W/m/K
The decay rate of an isotope is initially R0, but after one half-life has gone by, the rate is R0/2. At the end of the NEXT half-life, what will the decay rate be?
A) R0/4 B) 0 C) R0/16 D) R0/e E) R0/e2
The most massive main-sequence stars are the M stars
a. True b. False Indicate whether the statement is true or false
The number of stars in the observable universe
A) is approximately equal to the population of the Earth at the turn of the 21st century B) cannot be estimated C) is approximately equal to the total number of sand grains on every beach on Earth D) is infinitely large