A constant net force on a railroad car produces constant
A) velocity.
B) acceleration.
C) both of these
D) neither of these
Answer: B
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A resistor and a capacitor are connected in series to an ideal battery of constant terminal voltage. When this system reaches its steady-state, the voltage across the resistor is
A) greater than the battery's terminal voltage. B) equal to the battery's terminal voltage. C) less than the battery's terminal voltage, but greater than zero. D) zero.
A large cylindrical water tank is mounted on a platform with its central axis vertical. The water level is 3.75 m above the base of the tank, and base is 6.50 m above the ground. A small hole, 2.22 mm in diameter, has formed in the base of the tank
Both the hole and the top of the tank are open to the air. We can ignore air resistance and treat water as an ideal fluid with a density of 1000 kg/m3. (a) How many cubic meters of water per second is this tank losing? (b) How fast is the water from the hole moving just as it reaches the ground?
An electron moving perpendicular to a magnetic field of 3.2 × 10-2 T moves in a circle of radius 0.40 cm. How fast is this electron moving?
A) 2.3 × 107 m/s B) 1.9 × 10-53 m/s C) 1.9 × 10-30 m/s D) 3.0 × 109 m/s E) 0.80 × 107 m/s
The ratio of the radius of a classical electron (re = kee2/mec2 = 2.8 × 10^-15 m) to the radius of a 4He nucleus (r = r0A1/3) is
a. 2.0 b. 0.68 c. 1.5 d. 0.92 e. 2.4