A flattened combination of matter containing stars, gas, and dust in a spiral galaxy can be identified as:

a. A galaxy

b. A disk

c. An elliptical galaxy

d. Gravitation lensing

A person who has dissociative identity disorder: O A. cannot remember who he or she is. O B. has panic attacks when confronted. C. has two or more distinct personalities OD hears voices

A beam of light has a wavelength of 4.5 * 10^-7 meter in a vacuum. The frequency of this light is (1) 1.5 * 10^-15 Hz (3) 1.4 * 10^2 Hz (2) 4.5 * 10^-7 Hz (4) 6.7 * 10^14 Hz

Jake designed an experiment to demonstrate a solar eclipse. The steps of the experiment are listed below. Place a light bulb on a stand. Stick a pencil into a small styrofoam ball. Switch on the light bulb and darken the room.

2. What is the least possible error encountered when taking measurement with a meter rule? A. 1.0 mm. B. 0.5 mm. C. 0.2 mm. D. 0.1 mm.

A sound wave that has a wavelength of 2 m in room-temperature air has a frequency of about A. 170 Hz. B. 1360 Hz. C. 2040 Hz. D. none of the above

F an electron fell to a lower orbit or energy level, energy would be A. created. B. emitted. C. absorbed. D. transferred.

Which is the correct order from the closest to the sun to the farthest away from the sun? A. terrestrial planets, asteroid belt, gas planets, Kuiper belt B. gas planets, asteroid belt, terrestrial planets, Kuiper belt C.

Ethylene (C2H4) reacts with oxygen gas to produce carbon dioxide and water. 45.0 grams of ethylene reacts, how many grams of carbon dioxide gas will be produced?

What causes ice to melt and water to boil

A block of mass 3.5 kg slides down a frictionless inclined plane of length 6.4 m that makes an angle of 30 degrees with the horizontal. if the block is released from rest at the top of the incline, what is its speed at the bottom