The protective shells that many sea organisms grow are not minerals because they
A) are not calcium carbonate.
B) are organic.
C) are made of ooze.
D) become compacted.
Answer: B
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In the above model of an atom, where would the proton be located?
a. A
b. 1
c. 2
d. 3
When the outer envelope of a red giant is ejected, the remaining exposed core of a low mass star is called a
A. black hole. B. white dwarf. C. neutron star. D. red super giant.
A 35 mm camera using a standard 50.0 mm lens is focused on a 1.80 m tall person who is standing 3.25 m from the lens. You now refocus the camera on a 15.0 cm tall flower that is 75.0 cm from the lens
(a) In refocusing, by how much did you move the lens? Did you move it toward the film or away from it? (b) What is the height of the flower's image on the film?
Two protons, each of charge 1.60 × 10^-19 C, are 3.00 × 10^-5 m apart. What is the change in potential energy if they are brought 1.00 × 10^-5 m closer together? (ke = 8.99 × 10^9 N•m2/C2)
a. 3.84 × 10^-24 J c. 1.15 × 10^-23 J b. 3.20 × 10^-16 J d. 3.20 × 10^-19 J