Which of the following diagrams shows the greatest magnitude net torque with a zero net force? All the rods, of length 2r, rotate about an axis that is perpendicular to the rod and fixed in the center of the rod. All the forces are of magnitude F or 2F and all distances from the axis are r or r/2
a.
b.
b
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Sue is traveling toward you at 90 km/hr. She throws a baseball that, according to her, is going at 90 km/hr in the opposite direction. What do you see the ball doing?
A) You see the ball traveling away from you at 90 km/hr. B) You see the ball remaining stationary. C) You see the ball traveling away from you at 180 km/hr. D) You see the ball traveling toward you at 90 km/hr. E) You see the ball traveling toward you at 180 km/hr.
In order of increasing frequency, which of the following is correct?
a. visible, radio, ultraviolet and x-ray b. infrared, visible, ultraviolet and gamma c. visible, gamma, ultraviolet and x-ray d. infrared, x-ray, visible and gamma
A single slit, which is 0.0500 mm wide, is illuminated by light of 550 nm wavelength. What is the angular separation between the first two minima on either side of the central maximum?
What will be an ideal response?
An observer in the Northern Hemisphere takes a time exposure photograph of the night sky. If the illustration below depicts the photograph taken by the observer, which direction was the camera pointing?
a.
straight north
b.
straight east
c.
straight south
d.
straight west
e.
straight up, directly overhead