The three stars of the Summer Triangle are
A) Antares, Arcturus, and Spica.
B) Arcturus, Vega, and Algol.
C) Deneb, Spica, and Vega.
D) Vega, Deneb, and Altair.
E) Altair, Antares, and Arcturus.
D
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Asteroids are the densest form of interplanetary debris
Indicate whether the statement is true or false
What keeps the Sun's outer layers from continuing to fall inward in a gravitational collapse?
A) neutrinos produced by nuclear fusion drag gas outward B) the strong force between protons C) electromagnetic repulsion between protons D) outward pressure due to super-heated gas
A spring (k = 600 N/m) is placed in a vertical position with its lower end supported by a horizontal surface. A 2.0-kg block that is initially 0.40 m above the upper end of the spring is dropped from rest onto the spring. What is the kinetic energy of the block at the instant it has fallen 0.50 m (compressing the spring 0.10 m)?
a. 5.3 J b. 6.8 J c. 6.3 J d. 5.8 J e. 6.5 J
Is the specified change in the following objects’ thermal energies due to a flow of heat (A), work (B), or some other flow of energy (E)?
(a) A hot cup of tea on a table becomes cooler with time. (b) A meteorite entering the atmosphere becomes hot. (c) Liquid nitrogen poured on a slab of ice boils furiously. (Liquid nitrogen’s boiling point is 77 K.) (d) Infrared laser light falling on a metal slab makes it hot. (e) A drill bit gets hot as it drills a hole in a metal slab.