In the context of a big bang model, identify a true statement about the flatness problem
A) It is the peculiar circumstance that the early Universe's average density was much more than the critical density but it was still flat.
B) It is the peculiar circumstance that the actual density of the Universe will always be equal to the critical density and will always remain flat.
C) It is the peculiar circumstance that the early Universe must have contained exactly the right amount of matter to make space-time flat.
D) It is the peculiar circumstance that the early Universe's average density was considerably less than the critical density but it was still flat.
C
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A hockey puck slides off the edge of a horizontal platform with an initial velocity of 20 m/s horizontally. The effects of air are negligible. The height of the platform above the ground is 2.0 m
What is the magnitude of the vertical component of the velocity of the puck just before it hits the ground? A) 20 m/s B) 6.3 m/s C) 13 m/s D) 15 m/s E) 21 m/s
Which of the following is not a property of an aqueous solution of an acid?
a. Reacts with many metals to liberate hydrogen gas b. Changes the color of litmus dye from red to blue c. Tastes sour d. Conducts an electric current
How much heat is necessary to change 10 g of water at 30°C into steam at 100°C?
a. 0.07 kcal b. 0.7 kcal c. 6.1 kcal d. 0.67 kcal
How did James Joule determine how much work is equivalent to how much heat?
a. By attaching a team of horses to cannon-boring equipment. b. By repeating Rumford's experiments but measuring the amount of heat created. c. By defining one horsepower as the rate that a very strong horse does work. d. By creating a system where he could change the heat either with work or with external heat sources. e. By heating a gram of water by one degree.