The position of a particle as it moves along the x axis is given for t > 0 by x = (t3 ? 3t2 + 6t) m, where t is in s. Where is the particle when it achieves its minimum speed (after t = 0)?
a. 3 m
b. 4 m
c. 8 m
d. 2 m
e. 7 m
b
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This photograph shows a hurricane from space. Why does it have the clockwise swirl?
A) because of the Coriolis effect B) because it is a strong hurricane C) because it is in the Northern Hemisphere D) because of the greenhouse effect
The phase angle of an LRC series circuit with a capacitive reactance of 40 ?, a resistor of 100 ? and a certain inductor at 1000 Hz is 40.0°. What is the value of the inductance in this circuit?
A) 11.8 mH B) 124 mH C) 212 mH D) 61.9 mH E) 19.7 mH
When red light illuminates a grating with 7000 lines per centimeter, its second maximum is at 62.4°. What is the wavelength of this light?
What will be an ideal response?
A ball is thrown vertically upward with an initial speed of 20 m/s. Two seconds later, a stone is thrown vertically (from the same initial height as the ball) with an initial speed of 24 m/s. At what height above the release point will the ball and stone pass each other?
a. 17 m b. 21 m c. 18 m d. 27 m e. 31 m