Daisy throws a rock horizontally with a speed of 12.0 m/s from a bridge. It falls 2.28 s before reaching the water below
(a) When the rock hits the water it is traveling with what horizontal component of velocity?
(b) What was the total speed just before hitting the water?
(a) 12.0 m/s
(b) 25.4 m/s
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Redshift surveys give us:
A) an idea of how turbulent the intergalactic gas is. B) a 3-D layout of galaxies in space. C) the total mass of the universe. D) a more accurate census of the Local Group. E) a better value of the speed of light.
A test tone used on a radio has a frequency of 1,000 Hz. What is the wavelength of this sound in air at normal room temperature? (The speed of sound is 344 meters per second.)
Find the uncertainty in the momentum (in kg ? m/s) of an electron if the uncertainty in its position is equal to 3.4 × 10^?10 m, the circumference of the first Bohr orbit
a. 6.2 × 10^?25 b. 1.6 × 10^?25 c. 15.5 × 10^?25 d. 19.4 × 10^?25 e. 2.0 × 10^?24
Clusters of galaxies are distributed in space ____
a. homogenously b. isotropically c. in long, narrow filaments surrounding empty voids d. statically e. in bubbles surrounded by empty walls