A soda straw is stuck into water at an angle of 36° to the vertical. Looking straight down, what does the angle of the submerged portion of the straw to the vertical appear to be?
44°
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In a closed universe, the angles of a triangle add up to
A) less than 180 degrees. B) 180 degrees. C) more than 180 degrees.
A proton has a total energy of 2.5 × 10^?10 J. How fast is it moving? (mp = 1.67 × 10^?27 kg)
a. 0.90c b. 0.80c c. 0.70c d. 0.60c e. 0.40c
Angular Momentum: Initially, a small 2.0-kg rock is whirling at the end of a very thin string in a circular path of radius 0.75 m on a horizontal frictionless surface, as shown in the figure. The initial tangential speed of the rock was 5.0 m/s. The string has been slowly winding around a vertical rod, and a few seconds later the length of the string has shortened to 0.25 m. What is the instantaneous speed of the mass at the moment the string reaches a length of 0.25 m?
A. 3.9 m/s B. 9.3 m/s C. 15 m/s D. 225 m/s E. 75 m/s
How does a permanent magnet work, i.e., what is the explanation of its magnetic effects?
A) Electric charge is permanently separated within the magnet, with positive static charge at one end and negative static charge at the other end of the magnet. B) Electrons orbiting individual atoms in the magnet are all aligned together so that their orbital motion produces a large overall effect. C) The material of the magnet is highly ionized, with one type of ion residing on one end of the magnet and the other type of ion residing on the other end. D) Subatomic particles known as "magnetic poles" are placed on each end of the magnet, with one type of pole placed on one end and the other type on the other end. E) Magnets are a communist plot.