An astronomical telescope is made with lenses of focal lengths 80.0 and 1.25 cm. What magnifying power does this telescope provide?
A. 10
B. 81
C. 79
D. 64
E. 41
D. 64
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When strong solar wind storms are diverted poleward by our magnetic fields, we often observe ________ in the ionosphere
Fill in the blank(s) with correct word
Since the rest energy of an electron and its antiparticle a positron is 0.511 MeV, a gamma ray must have an energy larger than 1.022 MeV to produce an electron-positron pair
a. True b. False Indicate whether the statement is true or false
Two uniform solid balls, one of radius R and mass M, the other of radius 2R and mass 8M, roll down a high incline. They start together from rest at the top of the incline. Which one will reach the bottom of the incline first?
A) The small sphere arrives first. B) Both reach the bottom at the same time. C) The large sphere arrives first.
Discuss the various energy conversions that occur when a person performs a pole vault. Include as many conversions as you can, and consider times before, during, and after the actual vault itself
What will be an ideal response?