A string is strung horizontally with a fixed tension. A wave of frequency 100 Hz is sent along the string, and it has a wave speed of 100 m/s. Then a second wave, one of frequency 200 Hz, is sent along the string. What is the wave speed of the second wave?
a. 25.0 m/s
c. 70.7 m/s
b. 50.0 m/s
d. 100 m/s
D
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According to modern science, what was the approximate chemical composition of the solar nebula?
A) 98% hydrogen and helium, 2% everything else B) 50% hydrogen and helium, 50% everything else C) 98% hydrogen, 2% helium D) roughly equal proportions of hydrogen, helium, water, and methane
One of the most fundamental discoveries about the universe has been that it is expanding. "The universe is expanding" means
A) the cosmological horizon is growing with time. B) galaxies are growing with time. C) distances between most galaxies are getting larger. D) our estimate for the size of the universe has increased over the last century.
Two equal charges, each Q, are separated by some distance. What third charge would need to be placed half way between the two charges so that the net force on each charge would be zero?
a. -Q/8 c. -Q/4 b. -Q d. -Q/2
Pretend an object is set sliding on a huge frictionless plane in contact with the surface of Earth as shown. Once the object is set in motion it will
1) theoretically slide to the right forever 2) slide back and forth 3) slow down and stop because 4) of its inertia. 5) gravitational force decreases with increasing distance. 6) the object is sliding "uphill" and then "downhill" relative to the round Earth.