State the Conservation of Mechanical Energy
What will be an ideal response?
In systems with conservative forces only, the mechanical energy is conserved.
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For which of the following is the celestial sphere an accurate representation of reality?
A. the view of the stars from Earth B. the motion of the planets around Earth C. the spherical bubble that surrounds Earth D. the distance to the stars E. the motion of the Sun around Earth
A spherical ball of lead (density 11.3 g/cm3 ) is placed in a tub of mercury (density 13.6 g/cm3 ). Which answer best describes the result?
A) The lead ball will float with about 17% of its volume above the surface of the mercury. B) The lead ball will float with about 83% of its volume above the surface of the mercury. C) The lead will sink to the bottom of the mercury. D) The lead ball will float with its top exactly even with the surface of the mercury.
Pressure: When a heavy metal block is supported by a cylindrical vertical post of radius R, it exerts a force F on the post. If the diameter of the post is increased to 2R, what force does the block now exert on the post?
A. F/4
B. F/2
C. F/
D. F
E. 2F
A galvanometer with a coil resistance of 40.0 ? deflects full scale for a current of 2.0 mA. What series resistance should be used with this galvanometer in order to construct a voltmeter that deflects full scale for 50 V?
A) 25 k? B) 27 k? C) 29 k? D) 31 k? E) 35 k?