The longer the period of pulsation for a Cepheid, the more massive and luminous the variable giant star is
Indicate whether the statement is true or false
TRUE
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Earth's rotation is connected with a very slow celestial motion that can be detected only over _____
a. centuries b. decades c. a year d. a few months e. short brief periods
Collisions in Two Dimensions: A 2.0-kg ball moving eastward at 3.0 m/s suddenly collides with and sticks to a 4.0-kg ball moving northward at 2.0 m/s. What is the magnitude of the momentum of this system just after the collision?
A. 14 kg ? m/s B. 2.0 kg ? m/s C. 10 kg ? m/s D. 6.0 kg ? m/s E. 8.0 kg ? m/s
In a rollercoaster, provided losses of thermal energy because of friction can be neglected because:
a. the mechanical energy increases as the car moves to the top of the slope. b. the mechanical energy decreases as the car moves to the top of the slope. c. the gravitational potential energy decreases as the car moves to the top of the slope. d. the kinetic energy decreases as the car moves to the top of the slope. e. the rollercoaster moves at constant speed as its height above the ground increases.
When the frequency of the light is increased in a photoelectric effect experiment, the energy of the emitted electrons __________
Fill in the blank(s) with correct word