Phase Angles: A series circuit consists of an ac voltage source of frequency 60 Hz and source voltage amplitude 345 V, a resistor of resistance 393 ?, a capacitor of capacitance 2.7 × 10-6 F, and an inductor of inductance L.(a) What must be the value of L for the phase angle of the circuit to be zero?(b) When L has the value calculated in part (a), what is the current amplitude in the circuit?
What will be an ideal response?
(a) 2.6 H (b) 0.878 A
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A puck moves on a horizontal air table. It is attached to a string that gradually winds itself up around a round peg in the center of the table. This shortens the string, so the puck gradually spirals in towards the center
What happens to the magnitude of the puck's angular momentum?
To achieve a low equivalent resistance for a pair of resistors, connect them in
A) series. B) parallel. C) either of these
Energy Conservation With Conservative Forces: Two identical grasshoppers jump into the air with the same initial speed and experience no air resistance. Grasshopper A goes straight up, but grasshopper B goes up at a 66° angle above the horizontal. Which of the following statements about these grasshoppers are correct? (There could be more than one correct choice.)
A. At their highest point, both of them have the same amount of gravitational potential energy. B. At their highest point, both of them have the same amount of kinetic energy. C. At their highest point, both of them have the same amount of mechanical energy. D. At their highest point, grasshopper B is moving faster than grasshopper A. E. At their highest point, grasshopper A has more gravitational potential energy than grasshopper B.
Which of these is stated properly?
a. "The temperature of liquid nitrogen is 77 Kelvin.". b. "The temperature of liquid nitrogen is 77 Kelvins.". c. "The temperature of liquid nitrogen is 77 degrees Kelvin.". d. "The temperature of liquid nitrogen is 77 Kelvin degrees.".