Luminosity class IV objects are known as ____________________
Fill in the blank(s) with correct word
subgiants
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An electron is released form rest in a region of space where a uniform electric field is present. Joanna claims that its kinetic and potential energies both increase as it moves from its initial position to its final position. Sonya claims that they both decrease. Which one, if either, is correct?
a. Joanna, because the electron moves opposite to the direction of the field. b. Sonya, because the electron moves opposite to the direction of the field. c. Joanna, because the electron moves in the direction of the field. d. Sonya, because the electron moves in the direction of the field. e. Neither, because the kinetic energy increases while the electron moves to a point at a higher potential.
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
According to observations, which type of galaxy was much more common when the universe was 2 billion years old than it is today?
A) irregular galaxies B) elliptical galaxies C) spiral galaxies D) We can't say because humans were not alive at that time.
Several of the tributary canyons of the Valles Marineris on Mars are thought to be formed:
A. when water coming from the volcanoes started flowing through the planet. B. from impacts with irregularly shaped comets and asteroids. C. from a chemical reaction between iron oxide and water. D. when strong wind currents along the equatorial region started blowing out sand. E. when ground water, escaping from opening cracks, flowed and cut a channel through the surface beneath.