Which of the following correctly describes how light will be affected as it tries to escape from the vicinity of a massive object like a black hole?
A) Light doesn't have mass; therefore, it is not affected by gravity.
B) The light will be redshifted.
C) The light will be blueshifted.
D) The visible light will be redshifted, but higher frequencies, such as x-rays and gamma rays, will not be affected.
B) The light will be redshifted.
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A model airplane is flying north at 12.5 m/s initially - and 25 seconds later is observed heading 30 degrees west of north at 25 m/s. What is the magnitude of the average acceleration during this time interval?
A. 0.37 
B. 0.50
C. 0.62
D. 0.87
The geological history of Mars is divided into different
A) eons B) eras C) periods D) epochs
Three point charges, two positive and one negative, each having a magnitude of 20 ?C are placed at the vertices of an equilateral triangle (30 cm on a side). What is the magnitude of the electrostatic force on one of the positive charges?
a. 69 N b. 40 N c. 80 N d. 57 N e. 20 N
What does the mean radiant temperature represent?
What will be an ideal response?