physics exam 3 chapter 11 and 12 online homework
What are the five most common elements in humans? a. C, H, O, N, and Ca b. H20, O2, Ca, N2, and C c. C, H, O, N, and Fe d. H, He, C, O, and N
a. C, H, O, N, and Ca
How are most of the elements with nuclei heavier than those of hydrogen and helium formed? a. Nuclear fusion in stars b. Nuclear fission in supernovas
a. Nuclear fusion in stars
How does one isotope differ from another? a. it has a different number of neutrons b. it has a different number of electrons c. it has a different electric charge d. it has a different number of protons
a. it has a different number of neutrons
How do matter and antimatter differ? a. when matter and antimatter meet, they annihilate in a flash of energy b. matter emits light, whereas antimatter absorbs it c. matter gravitationally attracts matter and repels antimatter d. antimatter has negative weight
a. when matter and antimatter meet, the annihilate in a flash of energy
What is the most abundant element in the known universe? a. helium b. hydrogen c. carbon d. iron
b. hydrogen
How does the electric charge of a proton compare with the electric charge of an electron? a. It is about 2000 times larger b. it is equal and opposite c. it is about 2000 times larger and opposite in sign d. it is equal
b. it is equal and opposite
Why aren't vertical columns needed to support the middle of domed stadiums, such as the Houston Astrodome? a. compression forces create tension forces that support the dome b. the weight produces compression that supports the dome c. friction created by gravity supports the dome d. tension forces support the dome
b. the weight produces compression that supports the dome
If the linear dimensions of an object are doubles, by how much does the surface area increase? By how much does the volume increase? a. 6 times, 8 times b. 8 times, 4 times c. 4 times, 8 times d. 4 times, 4 times
c. 4 times, 8 times
Where in the atom is most of its mass concentrated? What is this mass composed of? a. In a cloud of nucleons surrounding the nucleus b. In the nucleus as electrons c. In the nucleus as protons and neutrons d. In the electron cloud
c. in the nucleus as protons and neutrons
What is the volume of a sugar cube that measures 1 cm on each side? What is the cross-sectional area of the cube? The total surface area? a. 1 cm3, 1 cm2, 1 cm2 b. 1 cm3, 2 cm2, 4 cm2 c. 1 cm3, 2 cm2, 6 cm2 d. 1 cm3, 1 cm2, 6 cm2
d. 1 cm3, 1 cm2, 6 cm2
What kind of attraction pulls electrons close to the atomic nucleus? a. magnetic b. nuclear c. gravitational d. electric
d. electric
Why were so many vertical columns needed to support the roofs of stone buildings in ancient Egypt and Greece? a. the columns are decorative elements b. stone breaks alone the neutral line c. stone breaks under compression d. stone breaks under tension
d. stone breaks under tension
Rank them from highest to lowest for their surface area per weight
dog horse elephant
Consider these three animals: dog horse elephant Rank them from highest to lowest for their surface areas
elephant horse dog
Rank them from highest to lowest for their masses
elephant horse dog
Rank them from highest to lowest for their weights
elephant horse dog
Rank them from highest to lowest for their volumes
elephant horse dog
