Consider a situation where you exert a force F on a crate of mass m, moving it at a speed v a distance d across a floor in a time interval t. The potential energy of the crate is __________
Fill in the blank(s) with correct word
zero
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The Tully-Fisher relation exists between the galaxy's luminosity and its:
A) color. B) age. C) rotation. D) mass. E) size.
In a certain cyclotron, a proton of mass 1.67 × 10-27 kg moves in a circle of diameter 1.6 m with an angular speed of 2.0 × 106 rad/s. What is the angular momentum of the proton?
A) 1.3 × 10-21 kg ? m2/s B) 1.8 × 10-21 kg ? m2/s C) 2.1 × 10-21 kg ? m2/s D) 3.2 × 10-21 kg ? m2/s
Magnetic Field of a Long Wire: Three very long, straight, parallel wires each carry currents of 4.0 A, directed out of the page as shown in the figure. These wires pass through the vertices of a right isosceles triangle as shown. Assume that all the quantities shown in the figure are accurate to two significant figures. What is the magnitude of the magnetic field at point P at the midpoint of the hypotenuse of the triangle? (?0 = 4? × 10-7 T ? m/A)
A. 4.4 µT B. 18 µT C. 57 µT D. 130 µT E. 1.8 µT
Which of the following is not true?
1.If the average velocity of a particle over some interval is equal to zero, the instantaneous velocity of the particle over that interval may not be equal to zero at any time during the interval. 2.The instantaneous velocity of a particle can be less than its average velocity. 3.The instantaneous velocity of a particle can be greater than its average velocity. 4.If the average velocity of a particle over some interval is equal to zero, the instantaneous velocity of the particle over that interval must be equal to zero at some time during the interval.