Consider horizontal parallel plates with a fixed potential difference. The upper plate has a voltage difference of 30 V with the lower plate, and they are separated by 3 cm. You move the two plates carefully to a separation of 4 cm. What is the strength of the electric field between the plates?
A. 1000 volts/meter
B. 750 volts/meter
C. 7.5 volts/meter
D. 3000 volts/meter
Answer: B
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Springs: An object attached to a spring is pulled across a horizontal frictionless surface. If the force constant (spring constant) of the spring is 45 N/m and the spring is stretched by 0.88 m when the object is accelerating at 1.4 m/s2, what is the mass of the object?
A. 28 kg B. 24 kg C. 31 kg D. 36 kg
Doubling the number of effective opaque layers in a planet’s atmosphere from n to 2n will make its average surface temperature increase by what factor?
A. 2 B. 21/4 C. 31/4 D. (2 + 1/n)1/4 E. [2 + 1/(n+1)]1/4 F. Some other factor (specify) T. The factor depends on the planet’s initial temperature.
By what primary thermal energy transfer mechanism does the Sun warm Earth?
A) convection B) conduction C) radiation D) All of the above processes are equally important in combination.
The electric potential of a charge distribution is given by the equation V(x) = 3 x2 y2 + y z3 - 2 z3x, where x, y, z are measured in meters and V is measured 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