Sunspots are hot spots on the Sun's surface caused by weak magnetic fields
Indicate whether the statement is true or false
False
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What do astronomers mean when they say the universe is expanding?
A) Everything in the universe is gradually growing in size. B) Average distances are increasing between most galaxies. C) Average distances are increasing between most stars. D) The universe is expanding from a single point.
Two water waves meet at the same point, one having a displacement above equilibrium of 60 cm and the other having a displacement above equilibrium of 40 cm. At this moment, what is the resulting displacement above equilibrium?
a. 140 cm b. 100 cm c. 70 cm d. Information about the amplitudes needs to be given to find an answer.
Two masses are being pulled up a 30.0 degrees incline by a force F parallel to the incline. The acceleration down the incline is 1.00 
and the velocity is up the incline. The force is applied to a 200 kg mass and a string connects the 200 kg mass to a 150 kg mass. The coefficient of kinetic friction is 0.200. The tension in the string is
A. 840 N. B. 980 N. C. 1,140 N. D. 1,530 N. E. 2,660 N.
A glass rod is rubbed with nylon. The rod is then brought close to the metal knob of an electroscope. A person's finger briefly touches the knob on the far side and is then removed. After the rod is removed the charge on the electroscope will be ________.
Fill in the blank(s) with the appropriate word(s).