A 1000-kg car approaches an intersection traveling north at 20.0 m/s. A 1200-kg car approaches the same intersection traveling east at 22.0 m/s
The two cars collide at the intersection and lock together. Ignoring any external forces that act on the cars during the collision, what is the velocity of the cars immediately after the collision?
A) 21.1 m/s in a direction 52.8° east of north
B) 15.1 m/s in a direction 52.8° east of north
C) 21.1 m/s in a direction 47.7° west of south
D) 29.7 m/s in a direction 47.7° east of north
E) 21.1 m/s in a direction 47.7° east of north
B
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The frequency of a wave describes ________.
A. the speed at which a wave crest passes a given point B. the number of wave crests that pass a given point in 1 second C. the distance between two successive peaks in a wave D. the time it takes for two crests to pass a given point
Violet light (? = 430 nm) is incident on a piece of potassium (? = 2.20 eV). What is the maximum kinetic energy of the ejected photoelectrons? (h = 6.63 × 10^?34 J?s, c = 3.00 × 10^8 m/s, 1 eV = 1.60 × 10^?19 J, and 1 nm = 10?9 m)
a. 2.43 eV b. 0.69 eV c. 2.89 eV d. 5.09 eV e. 0.96 eV
The observed relationship between the masses of central black holes and the bulge masses of galaxies implies that
A) galaxy formation and supermassive black hole formation must be related. B) the black hole will eventually suck in the rest of the galaxy. C) the biggest galaxies have the most luminous quasars. D) quasars were more common 10 billion years ago than they are today.
Any particle with spin obeys the Pauli exclusion principle
Indicate whether the statement is true or false