A 10-kg piece of aluminum sits at the bottom of a lake, right next to a 10-kg piece of lead, which is much denser than aluminum. Which one has the greater buoyant force on it?
A) the aluminum
B) the lead
C) Both have the same buoyant force.
D) It cannot be determined without knowing their volumes.
A
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The centers of two slits of width a are a distance d apart. If the fourth minimum of the interference pattern occurs at the location of the first minimum of the diffraction pattern for light of wavelength ?, the ratio a/d is equal to
A.
B.
.C.
.D.
.E.
.A 2.00-g bullet hits and becomes embedded in a 5.00-kg wood block which is hanging from a 1.20-m long string. This causes the block to swing through an arc of 3.50°. What was the speed of the bullet before it hit the block?
A) 16.7 m/s B) 524 m/s C) 25.3 m/s D) 262 m/s E) 789 m/s
Two large, flat, horizontally oriented plates are parallel to each other, a distance d apart
Half way between the two plates the electric field has magnitude E. If the separation of the plates is reduced to d/2 what is the magnitude of the electric field half way between the plates? A) 4E B) 2E C) E D) 0 E) E/2
An ideal transformer is used to either increase or decrease the voltage in an AC circuit. When the output voltage is greater than the input voltage of a transformer then
A. the power output is smaller than the power input. B. the power output depends on the ratio of turns in the primary and secondary. C. the power output is the same as the power input. D. the power output is larger than the power input.