Rubber rods charged by rubbing with cat fur repel each other. Glass rods charged by rubbing with silk repel each other. A rubber rod and a glass rod charged respectively as above attract each other. A possible explanation is that
a. Any two rubber rods charged this way have opposite charges on them.
b. Any two glass rods charged this way have opposite charges on them.
c. A rubber rod and a glass rod charged this way have opposite charges on them.
d. All rubber rods always have an excess of positive charge on them.
e. All glass rods always have an excess of negative charge on them.
c
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An object is rotating with an angular momentum 4.00 kg ? m2/s while being acted on by a constant torque 3.00 N ? m . What is the angular speed of precession of the angular velocity of the object?
A) 1.33 rad/s B) 0.750 rad/s C) 12.0 rad/s D) zero E) It depends on the moment of inertia of the object.
Combining Newton's and Kepler's laws, we can weigh the Sun, provided we know:
A) its density as found by spectroscopy. B) its temperature as found by Wien's Law. C) the size of the A.U. and exact length of the year. D) the Earth's mass and circumference. E) the exact timings of the transits of Venus and its diameter.
A sample of gas expands. Which of the following would not account for this?
1.The pressure on the gas increased. 2.The temperature of the gas increased. 3.The pressure on the gas decreased. 4.All of these could account for this.
What formation foes a composite volcano have?
What will be an ideal response?