A non-conducting sphere of radius R = 7.0 cm carries a charge Q = 4.0 mC distributed uniformly throughout its volume. At what distance, measured from the center of the sphere, does the electric field reach a value equal to half its maximum value?
A) 3.5 cm only
B) 4.9 cm only
C) 3.5 cm and 9.9 cm
D) 3.5 cm and 4.9 cm
E) 9.9 cm only
C
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Two twin sisters, Gwen and Jackie, are both 20 years old in the year 2050. Jackie takes off on a round-trip to Vega, 25 light-years away. She travels at an average speed of 0.9999c. Which of the following best describes the situation according to Jackie?
A) Jackie stays still, while Earth rushes away from her at 0.9999c and Vega rushes toward her at 0.9999c. She sees the distance from Earth to Vega shortened considerably from 25 light-years, and therefore it takes far less than 25 years for Vega to reach her. B) Jackie stays still, while Earth rushes away from her at 0.9999c and Vega rushes toward her at 0.9999c. Because Vega is 25 light-years away, she says it takes Vega about 25 years to reach her. C) Jackie says that the 25 light-year trip takes only a few months, and therefore concludes that she is traveling faster than the speed of light. D) It takes her 25 years to reach Vega.
William Herschel was the discoverer of Uranus
Indicate whether the statement is true or false
A Young's double-slit experiment is performed, and the distance between bright fringes is d0 . If the experiment is repeated, this time under water, what is the relationship between the new distance between bright fringes, dw, and the original distance, d0?
a. dw < d0 b. dw = d0 c. dw > d0 d. Not enough information
What causes pressure differences to arise, and hence causes the wind to blow?
What will be an ideal response?