A certain membrane has a diffusion constant 
and a thickness of
The area of the membrane is 5.00 
If the difference in the concentration across the membrane is 2.44 
then the rate of particles diffusing through the membrane is
A. 
B. 
C. 
D. 
E. 
B.
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The charge on a glass rod which has been rubbed with silk is called positive:
A) by arbitrary convention B) so that the proton charge will be positive C) to conform to the conventions adopted for G and m in Newton's law of gravitation D) because like charges repel E) because glass is an insulator
Recall that Hubble's law is written v = H0d, where v is the recession velocity of a galaxy located a distance d away from us, and H0 is Hubble's constant. Suppose H0 = 65 km/s/Mpc
How fast would a galaxy located 500 megaparsecs distant be receding from us? A) 65 km/s B) 65 Mpc/s C) 32,500 km/s D) 9 km/s E) 0.65 times the speed of light
Equal charges are located at the vertices of a 3-4-5 triangle. The charge experiencing the largest force is located at
A) the 90° vertex. B) the 37° vertex. C) a vertex that depends on the size of the charges. D) the 53° vertex. E) cannot be determined.
A 200-kg superhero, falling off a building manages to grab hold of the end of a 3.0 m-long flagpole, 5.0 cm in radius, which saves him from falling any further. After the oscillations have died down, the end of the flagpole is sagging 10 cm
What is the shear modulus of the pole? A) 7.5 × 106 N/m2 B) 2.4 × 106 N/m2 C) 7.5 × 107 N/m2 D) 2.4 × 107 N/m2 E) 2.4 × 105 N/m2