The Cassegrain reflector needs a primary concave main mirror and a smaller, convex secondary mirror to reflect light back through a hole in the primary
Indicate whether the statement is true or false
TRUE
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Capacitors in Combination: The network shown is assembled with uncharged capacitors X , Y, and Z, with CX = 3.0 ?F, CY = 5.0 ?F and CZ = 1.0 ?F. The switches S1 and S2 are initially open, and a potential difference Vab = 120 V is applied between points a and b. After the network is assembled, switch S1 is then closed, but switch S2 is kept open. What is the final potential difference across capacitor Z? 
A. 100 V B. 600 V C. 55 V D. 38 V E. 29 V
The direction of the force on a current-carrying wire in a magnetic field is
A) in the direction opposite to the current. B) perpendicular only to the current. C) perpendicular only to the magnetic field. D) in same direction as the current. E) perpendicular to both the current and the magnetic field.
Inside the nucleus, the strongest of the four fundamental forces is
A) the gravitational force. B) the weak nuclear force. C) the electromagnetic force. D) the strong nuclear force.
Which of the following is one of the drawbacks of the automobile engine?
A) CO2 is injected into the atmosphere B) CO is injected into the atmosphere C) the internal combustion engine has none of these drawbacks D) the internal combustion engine has all of these drawbacks E) low efficiency