Some automobiles have air bags installed on their dashboards as a safety measure. The impact of a collision causes the bag to inflate, and it then cushions a passenger's head when he is thrown forward in the car
Suppose that such a bag could lengthen the collision time between one's head and the dashboard by a factor of 10. What effect would this have on the force exerted on the head? A) The force would be reduced by a factor of about 3.
B) The force would be reduced by a factor of about 1000.
C) The force would be reduced by a factor of about 10.
D) The force would not be reduced, but the energy transferred to the head would be, thereby minimizing the damage done.
E) The force would be reduced by a factor of about 100.
C
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Coastal lands bordering the oceans generally have
A) colder temperatures than lands away from the ocean. B) more moderate temperature variations than inland areas. C) more scenery than land in the continental interior. D) tropical temperatures due to the high heat capacity of water.
Sirius is a star with spectral type A and Rigel is a star with spectral type B. What can we conclude?
A) Sirius has a higher core temperature than Rigel. B) Sirius has a higher surface temperature than Rigel. C) Rigel has a higher surface temperature than Sirius. D) Rigel has a higher core temperature than Sirius.
Which is the longest time?
a) the time it takes for a photon to pass through the radiative zoneof the Sun b) the time it takes a photon to pass through the corona of the Sun c) one hour d) the time it takes a photon to pass from the photosphere of the Sun to the Earth e) the time it take light to traverse the convective zone of the Sun
Why are relatively few details known about the life that existed on Earth prior to a few hundred million years ago?
A) Nearly all life at that time was microscopic, making it much more difficult to identify. B) Many rocks have been transformed by high heat and pressure, destroying any fossils they contained. C) Older rocks are more rare than younger rocks because of geologic processes like subduction. D) All of the above