The lid of a grand piano is propped open as shown. Which arrow most closely approximates the direction of the force that the hinge exerts on the lid? Assume that the prop exerts a force in parallel to the prop’s length. (Hint: Draw a torque diagram of the lid.)
A. A
B. B
C. C
D. D
E. E
F. F
T. T
F. F
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A group of 10 to 100 stars that formed at the same time but are so widely scattered in space their mutual gravity cannot hold them together is called
a. a globular cluster. b. an open cluster. c. an association. d. a spherical component e. an accretion disk.
Double-lobed radio galaxies appear to be emitting jets of gas and radiation
Indicate whether the statement is true or false
Which of the following describes an experiment that demonstrates that light is a wave?
A) If you let light pass through a narrow "slit" formed by your fingers, you can detect the energy transfer as the light passes through your fingers. B) If you let light pass through a narrow "slit" formed by your fingers, you can see an interference pattern. C) If you allow light from a transparency projector to hit a small container full of water placed in front of the projector, you can detect an energy transfer as the light enters the water. D) a mystical experiment in which the instructor pulls a cosmic toad out of a baseball cap. E) If you allow light from a transparency projector to hit a small container full of water placed in front of the projector, you can see an interference pattern in the water.
Laccoliths and sills are examples of ______________ plutons
a. recordant b. precordant c. discordant d. concordant