The magnitude of a vector an only zero if all of its components are zero
A) True
B) False
A
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Hubble's Law states that v = H0d, and current measurements indicate that H0 ? 22 kilometers per second per million light-years. About how far away is a galaxy with a redshift indicating that it is moving away from us at 2200 kilometers per second?
A) 100 million light-years B) 200 million light-years C) 200 light-years D) 100 light-years
A ball thrown upwards reaches a maximum height and then comes back down to the original level. As the ball is going upwards
a. the velocity and acceleration both point up. b. the velocity points up and the acceleration down. c. the velocity points down and the acceleration up. d. the velocity and acceleration both point down. e. the acceleration is zero.
Two stars are both spectral type K2V; if the closer is magnitude +3.7, and the fainter is magnitude +8.7, then the brighter star is about ________ times closer
Fill in the blank(s) with correct word
A metal having a work function of 2.4 eV is illuminated with monochromatic light whose photon energy is 4.0 eV
What is the maximum kinetic energy of the photoelectrons produced by this light? (h = 6.626 × 10-34 J • s, 1 eV = 1.60 × 10-19 J) A) 2.6 × 10-19 J B) 4.7 × 10-19 J C) 3.8 × 10-19 J D) 5.5 × 10-19 J E) 6.4 × 10-19 J