A point charge of +3.0 mC is located at the origin of a coordinate system and a second point charge of -9.0 mC is at x = 1.00 m. What is the electric potential at the x = 0.50 m point? (ke = 8.99 × 10^9 N×m2/C2)
a. -5.4 × 10^4 V
c. 16 × 10^4 V
b. 11 × 10^4 V
d. -11 × 10^4 V
D
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An object attached to an ideal massless spring is pulled across a frictionless surface. If the spring constant is 45 N/m and the spring is stretched by 0.88 m when the object is accelerating at what is the mass of the object?
A) 20 kg B) 17 kg C) 22 kg D) 26 kg
A tiger is running in a straight line. If we double both the mass and speed of the tiger, the magnitude of its momentum will increase by what factor?
A) 8 B) 4 C) D) 16 E) 2
Which types of galaxies have a clearly defined disk component?
A) spirals only B) ellipticals only C) irregulars only D) both spirals and ellipticals
The most important fact about a cluster of stars that makes them useful for studying star formation is that
A) all the stars formed from the same cloud. B) all the stars formed at about the same time. C) all the stars are at the same distance from Earth. D) all the stars have the same chemical composition. E) all the stars are the same spectral type.