A plane has an airspeed of 142 m/s. A 30.0 m/s wind is blowing southward at the same time as the plane is flying. What must be the direction of the plane in order to move due east relative to the ground?
A) 78.1° north of east
B) 11.9° north of east
C) 77.8° north of east
D) 12.2° north of east
E) 55.3° north of east
D
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You throw a Frisbee of mass m and radius r so that it is spinning about a horizontal axis perpendicular to the plane of the Frisbee. Ignoring air resistance, the torque exerted about its center of mass by gravity is
a. 0. b. mgr. c. 2mgr. d. a function of the angular velocity. e. small at first, then increasing as the Frisbee loses the torque given it by your hand.
Which of the following best describes the sizes of atoms?
A) Atoms are so small that millions of them could fit across the period at the end of this sentence. B) Atoms are too small to see by eye, but can be seen with a handheld magnifying glass. C) Most atoms are about a millionth of a meter (1 micrometer) in diameter. D) Atoms are roughly the same size as typical bacteria.
Which of the following best describes the most likely internal structure of Europa?
A) thin icy crust, subsurface ocean of water, thick iron mantle, central rocky core B) thin icy crust, subsurface ocean of water, thick rocky mantle, central iron core C) thin icy crust, thick rocky mantle, central iron core D) surface ocean of water, thick rocky mantle, central iron core
A thin uniform spherical shell exerts a force on a particle located outside of it as if all the shell's mass were located at the center
Indicate whether the statement is true or false