Telescopes in space do not have the ‘seeing' issues of ground-based telescopes
a. True
b. False
Indicate whether the statement is true or false
True
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Free Fall: Suppose a ball is thrown straight up and experiences no appreciable air resistance. What is its acceleration just before it reaches its highest point?
A. zero B. slightly less than g C. exactly g D. slightly greater than g
A positively charged insulating rod is brought close to an object that is suspended by a string. If the object is repelled away from the rod we can conclude:
A) the object is positively charged B) the object is negatively charged C) the object is an insulator D) the object is a conductor E) none of the above
Which observation(s) and/or experiment(s) demonstrate ways that the chemical building blocks of life (amino acids and DNA bases) could have originated on the early Earth?
A) Amino acids and DNA bases form from simple chemical reactions in experiments simulating the early Earth atmosphere. B) These complex molecules have been found within meteorites. C) Experiments have shown that naturally occurring clays can catalyze the formation of RNA strands. D) All of the above
A 1520-N crate is to be held in place on a ramp that rises at 30.0° above the horizontal (see figure)
The massless rope attached to the crate makes a 22.0° angle above the surface of the ramp. The coefficients of friction between the crate and the surface of the ramp are µk = 0.450 and µs = 0.650. The pulley has no appreciable mass or friction. What is the MAXIMUM weight w that can be used to hold this crate stationary on the ramp? What will be an ideal response?