A crate sits on the ground. You push as hard as you can on it, but you cannot move it. At any given time when you are pushing, what is the magnitude of the static friction force exerted on the crate by its contact interaction with the ground compared to the magnitude of your push (which is a normal force)? (Hints: What is the crate’s acceleration? Draw a free-body diagram.)
A. 
B. 
C. 
D. 
E. We do not have enough information to answer.
B.
Physics & Space Science
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Gases and liquids are both fluids
Indicate whether the statement is true or false
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If you triple your distance from an object, what happens to its angular size?
A. It decreases by one half. B. It reduces to one third of what it was. C. It stays the same. D. It increases by a factor of nine.
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Unequal surface heating that causes localized pockets of air (thermals) to rise because of their buoyancy is termed ________.
Physics & Space Science
The elliptical shape of the Earth's orbit varies with time and takes about ____ to complete a cycle. This is a factor in the Milankovitch theory of ice ages
a. 24 hours b. one year c. 26 years d. 260 years e. 100,000 years
Physics & Space Science