An object moves along the x axis, with its position given by the function x(t) = ½ t3 . Which of the following can be obtained from a graph of x vs. t?
a. The velocity of the object at any instant in time
b. The displacement of the object during a specified time interval
c. The speed of the particle at any instant in time
d. The average velocity of the object during as specified time interval
e. All of the above
e
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The book "De Revolutionibus Orbium Coelestium"
a. describes how Galileo's observations and Kepler's calculations proved the Copernican theory. b. describes the construction of Galileo's telescope and his observations. c. is a dialog written to convince the general public of the merits of the Copernican theory. d. first described the Copernican theory. e. describes the Tychonian theory.
A horizontal uniform 1.20-N meter stick is held up by two vertical strings, one at the 20-cm mark and the other at the 60-cm mark. What is the tension in the string at the 60-cm mark?
a. 0.30 N b. 0.45 N c. 0.60 N d. 0.90 N e. 1.0 N
A charged capacitor is connected to an ideal inductor. At time t = 0, the charge on the capacitor is equal to 6.00 ?C
At time t = 2.00 ms the charge on the capacitor is zero for the first time. What is the amplitude of the current at that same instant? A) 0.780 mA B) 1.19 mA C) 2.38 mA D) 4.71 mA E) 1.53 mA
Three equal positive charges are placed on the x-axis, one at the origin, one at x = 2 m, and the third at x = 4 m. Of the following points, which has the greatest magnitude electric field?
a. x = 1 m b. x = 3 m c. x = 5 m d. The electric field has the same magnitude at all three positions.