Notice the blue ovals (such as those indicated by the arrows) in this image of a galaxy cluster. The oval structures are not really located where they appear to be, but instead are multiple images of a single galaxy that lies directly behind the cluster. What do we call the process that creates these multiple images?
A) gravitational lensing
B) cluster image distortion
C) the arc effect
D) dark energy
A) gravitational lensing
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Brass has a shear modulus of 
and a density of 
What is the velocity of shear waves in brass?
A. 2,560 m/s B. 2,239 m/s C. 2,003 m/s D. 1,981 m/s E. 1,755 m/s
A 1500-kg car accelerates from 0 to 25 m/s in 7.0 s with negligible friction and air resistance. What is the average power delivered by the engine? (1 hp = 746 W)
A) 50 hp B) 60 hp C) 70 hp D) 80 hp E) 90 hp
In a certain region, the electric potential due to a charge distribution is given by the equation V(x,y,z) = 3x2y2 + yz3 - 2z3x, where x, y, and z are measured in meters and V is in volts
Calculate the magnitude of the electric field vector at the position (x,y,z) = (1.0, 1.0, 1.0). A) 4.3 V/m B) 2.0 V/m C) -8.1 V/m D) 8.6 V/m E) 74 V/m
What characteristic of light mostly relates to color?
A) frequency B) amplitude C) both of these