The critical part of the atmosphere for protecting life on the ground from excessive ultraviolet radiation is the:
A) hydrosphere.
B) troposphere.
C) ozone layer.
D) stratosphere.
E) ionosphere.
C
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What can exist in the same place at the same time?
A) two large boulders B) two tiny boulders C) two waves D) all of the above E) none of the above
I walk six miles in a straight line in a direction north of east, and I end up four miles north and several miles east. How many degrees north of east have I walked?
a. 19° b. 42° c. 60° d. 71°
Molly measures a Hubble constant of 20 km/sec/million light-years. Sam measures a Hubble constant of 25 km/sec/million light-years. All other assumptions being the same, which person would estimate a LARGER age to the universe?
A) Sam B) Molly C) They both would measure the same age.
The density of aluminum is 2700 kg/m3. If transverse waves propagate at 34 m/s in a 4.6-mm diameter aluminum wire, what is the tension on the wire?
A) 52 N B) 31 N C) 42 N D) 62 N