If you are whirling a ball on a string and you suddenly cut the string, what happens?
a. The ball falls immediately to the ground.
b. The ball keeps traveling in the same circle.
c. The ball goes off in some random straight line.
d. The ball goes off in a straight line based on where it was heading when the string was cut.
e. The ball goes off in a straight line path directed radially outward from the center of the circle.
d
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Why did early civilizations observe constellations?
A) only for religious reasons B) for practical reasons, such as navigation and helping to determine seasons C) only for recreational reasons D) only to predict a person's destiny
The nucleus of lead-208, 
, has 82 protons within a sphere of radius 6.34 × 10?15. Each electric charge has a value of 1.60 × 10?19 C. Assuming that the protons create a spherically symmetric distribution of charge, calculate the electric field at the surface of the nucleus.
What will be an ideal response?
Exhibit 4-2Newton approximated motion in a circle as a series of linear motions, as in the polygon below.
Assume that the particle moves at constant speed vA from A to B, and at constant speed vB from B to C.Use this exhibit to answer the following question(s).
Refer to Exhibit 4-2. The direction of the change in velocity, 
, at point B, is shown by the arrow in
A.
B.
C.
D.
E.
An important condition for the operation of the Falkirk Wheel is that
A) water in each caisson have the same depth. B) ships carried are more or less equal in weight. C) no water spill when a ship enters a caisson. D) all of the above E) none of the above