A 95 N force exerted at the end of a 0.50 m long torque wrench gives rise to a torque of What is the angle (assumed to be less than 90°) between the wrench handle and the direction of the applied force?
A) 18°
B) 14°
C) 22°
D) 25°
A
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Springs: A very light ideal spring of spring constant (force constant) 2.5 N/cm is 15 cm long when nothing is attached to it. It is now used to pull horizontally on a 12.5-kg box on a perfectly smooth horizontal floor. You observe that the box starts from rest and moves 96 cm during the first 1.6 s of its motion with constant acceleration. How long is the spring during this motion?
Fill in the blank(s) with the appropriate word(s).
Match the words at the left to the correct blanks in the sentences at right. Use each choice only once.
A. A camera is an example of an instrument used for _________observations. B. _________ refers to telescopic observations in which we separate an object's light so we can measure its intensity at different wavelengths. C. If we want to confirm that a star's brightness alternately dims and brightens, we need __________ observations of the star. D. The familiar twinkling of the stars is caused by _____________, which also blurs telescopic images. E. Human civilization is responsible for what astronomers call ____________.
When examining a spectrum of a particular galaxy, an astronomer notices that thespectral lines are shifted toward shorter wavelengths. What does this mean?
a) the element Helium is present in that galaxy b) the galaxy is moving away from us c) the galaxy is very likely to be one of the nearest galaxies to the MilkyWay d) the entire Universe is contracting e) the galaxy is rotating very rapidly
If Planck's constant were smaller than it is, would this affect the sizes of atoms?
A) No, because atomic orbits do not exhibit quantum uncertainties. B) No, because the sizes of atoms are determined by the electromagnetic force acting between the nucleus and the electrons and this force is not affected by quantum phenomena. C) Yes, atoms would then be larger than they are, because quantum uncertainties would be larger. D) Yes, atoms would then be larger than they are because the electromagnetic force would be weaker. E) Yes, atoms would then be smaller than they are, because quantum uncertainties would be smaller.