What is the agreed-upon direction of rotational velocity?
a. The direction the object is rotating (effectively clockwise).
b. In the direction opposite to the way the object is rotating (effectively counterclockwise).
c. Along the axis of rotation in the direction your thumb would point if the fingers of your left hand curl along the motion of the spinning object.
d. Along the axis of rotation in the direction your thumb would point if the fingers of your right hand curl along the motion of the spinning object.
e. Along the axis of rotation in the direction your index finger would point if the thumb of your right hand points along the motion of the spinning object.
d
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Which of the following statements is true?
A) an atom is the smallest particle known to exist B) there are only about 100 different kinds of atoms that combine to form all substances C) there are thousands of different kinds of atoms that account for a wide variety of substances D) a large atom can be photographed with the aid of an ordinary microscope E) none of the above
Determine the missing product X in the reaction: n + U ? X + 2( e)
What will be an ideal response?
The molecular mass for chlorine is not an integer multiple of the molecular mass of hydrogen but is about 35.5 times the molecular mass of hydrogen. This is primarily because
a. the proton and neutron have different masses. b. there are different isotopes of chlorine. c. of the binding energy of the chlorine nucleus. d. the chlorine nucleus has 35.5 nucleons.
A satellite moves east, taken as the positive x axis direction, at a speed of 0.5c and a spaceship moves toward it (to the west) at a speed of 0.8c as measured by an observer on the Earth. The speed of the satellite measured by an observer in the spaceship is
a. 8.7c. b. 0.21c. c. ?0.21c. d. 0.93c. e. ?0.93c.