What prevents satellites such as the ISS from falling?
A) gravity
B) centripetal force
C) centrifugal force
D) the absence of air drag
E) nothing
Answer: E
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The interstate on-ramp is 1.5 km West of your home, and on leaving for grandmother’s house you are only able to accomplish an average velocity of 12 km/hr between your home and the on-ramp. At the onramp, you wait for traffic, for 2.0 min – and then are able to proceed toward grandmother’s house. If you wish to arrive there, which is 15 km South of the onramp, over a river and through some woods, in a total elapsed time of 25.0 minutes, what average speed must you maintain on the interstate highway?
A. 51 km/hr B. 67 km/hr C. 36 km/hr D. none of these.
Standing Sound Waves: Consider two pipes of the same length: one pipe is open at both ends and the other pipe is closed on one end but open at the other end. If the fundamental frequency of the totally open pipe is 300 Hz, what is the fundamental frequency of the other pipe?
A. 150 Hz B. 300 Hz C. 450 Hz D. 600 Hz
In attempting to find the missing matter that seems to be required to explain observed properties of galaxies and clusters, astronomers have been able to rule out which populations?
A. weakly interacting massive particles B. hot and cold gas C. black holes D. dead white dwarfs
What type of scan is used to find the areas of the body where glucose metabolism is most intense?
A) PET scans B) CT scans C) MRI D) radioactive iodine tracers