A moderate force will break an egg. However, an egg dropped on the road usually breaks, while one dropped on the grass usually doesn't break. This is because for the egg dropped on the grass:
a. the change in momentum is greater.
b. the change in momentum is less.
c. the time interval for stopping is greater.
d. the time interval for stopping is less.
c
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Which of the following statements about various stages of core nuclear burning (hydrogen, helium, carbon, and so on) in a high-mass star is not true?
A) Each successive stage creates an element with a higher atomic number and atomic mass number. B) As each stage ends, the reactions that occurred in previous stages continue in shells around the core. C) Each successive stage lasts for approximately the same amount of time. D) As each stage ends, the core shrinks and heats further.
A double convex lens has faces with radii of magnitudes 18.0 cm and 20.0 cm. When an object is placed 24.0 cm in front of the lens, a real image is formed 32.0 cm from the lens
(a) What is the focal length of this lens? (b) What is the index of refraction of the material from which the lens is made?
A waiter in a restaurant fills a pitcher full of water and ice so that water would spill out if any more were added. As the ice starts to melt
a. the water level in the pitcher falls. b. the water level in the pitcher remains the same. c. water starts to flow out the spout of the pitcher. d. the pressure on the bottom of the pitcher decreases. e. the pressure on the bottom of the pitcher increases.
Ideal Gas Law: How many moles are there in 2.00 kg of copper? The atomic weight of copper is 63.5 g/mol and its density is 8.90 g/cm3.
A. 15.3 B. 31.5 C. 51.3 D. 53.1