Suppose we looked at this image without its overlay of radio emission (that is, we looked only at the visible-light image). What features of the image would no longer be visible? Select all that apply.
A) the background galaxies
B) the central galaxy
C) the jets
D) the lobes
C) the jets
D) the lobes
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Compared with the standard hour of 60 minutes used today, the hour of ancient Egypt
A) was longer than the hour used today. B) was shorter than the hour used today. C) differed in length depending on the pharaoh in power at the time. D) was longer than 60 minutes in the summer and shorter than 60 minutes in the winter. E) divided the entire day into 12 equal parts.
Which of the following makes a meson?
a) a photon and a graviton b) an up quark and an anti-down quark c) three up quarks d) a charm quark and a strange quark e) two down quarks and an anti-up quark
An electron and a proton are separated by a distance of 1 m. What happens to the size of the force on the proton if the electron is moved 0.5 m closer to the proton?
A) It increases to 4 times its original value. B) It decreases to one-half its original value. C) It increases to 2 times its original value. D) It decreases to one-fourth its original value. E) It increases to 8 times its original value.
Inelastic Collisions: A 1000-kg whale swims horizontally to the right at a speed of 6.0 m/s. It suddenly collides directly with a stationary seal of mass 200 kg. The seal grabs onto the whale and holds fast. What is the momentum of these two sea creatures just after their collision? You can neglect any drag effects of the water during the collision.
A. 0.00 kg ? m/s B. 1200 kg ? m/s C. 2000 kg ? m/s D. 7200 kg ? m/s E. 6000 kg ? m/s