Newton's law of gravitational force states that ____
a. an object with no force on acting on it continues at rest or moves in uniform motion in a straight line with constant velocity
b. an object with no force on it moves in a straight line with constant acceleration
c. for every action, there is an equal and opposite reaction
d. the force between two objects is directly proportional to the product of their masses and inversely proportional to the distance between them squared
e. an object with a force on it is accelerated in the direction of the force an amount inversely proportional to its mass and directly proportional to the size of the force
d
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A comet's tail ________.
A. always trails behind the comet B. is gas and dust expelled from the comet's nucleus by the Sun's heat and radiation pressure C. is composed mainly of captured particles from the solar wind D. is gas and dust pulled off the comet by the Sun's gravity
Suppose that you measure the position of a chair using a meter stick and you record the distance of the center of the seat from the wall. Which of the following measurements is the most reasonable?
1.1.043 860 564 2 m 2.1.043 860 m 3.1 m 4.1.04 m
The magnetic field in a region of space is parallel to the surface of a long flat table. Imagine that this page is lying flat on the table. When current is present in the coil, which is lying on the table, the coil tends to rotate so that the left side moves up and the right side moves down. The magnetic field is
a.
directed parallel to the page and downwards.
b.
directed parallel to the page and upwards.
c.
directed parallel to the page and to the right.
d.
directed parallel to the page and to the left.
e.
in a direction that cannot be determined in this experiment
A 20 cm long organ pipe is filled with air and is open at one end and closed at the other. The velocity of sound in air at 0
is 331 m/s. What is the wavelength of the fundamental mode?
A. 40 cm B. 60 cm C. 80 cm D. 43 cm E. 75 cm