A 50. ? resistor is placed in series with a 40. mH inductor. At what frequency will the current in such a circuit lag the applied voltage by exactly 45°?
What will be an ideal response?
0.20 kHz
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An uncharged conductor has a hollow cavity inside of it. Within this cavity there is a charge of +10 µC that does not touch the conductor
There are no other charges in the vicinity. Which statement about this conductor is true? (There may be more than one correct choice.) A) The inner surface of the conductor carries a charge of -10 µC and its outer surface carries no excess charge. B) The inner and outer surfaces of the conductor each contain charges of -5 µC. C) The net electric field within the material of the conductor points away from the +10 µC charge. D) The outer surface of the conductor contains +10 µC of charge and the inner surface contains -10 µC. E) Both surfaces of the conductor carry no excess charge because the conductor is uncharged.
A CD with a diameter of 12.0 cm starts from rest and with a constant angular acceleration of 1.00 rad/sec2 acquires an angular velocity of 5.00 rad/sec. The CD continues rotating at 5.00 rad/sec for 15.0 seconds and then slows to a stop in 12.0 second with a constant angular deceleration. What is the angular distance traveled by a point 4.00 cm from the center, at the time 25.0 seconds from the start?
A. 107 rad B. 193 rad C. 205 rad D. 237 rad E. 274 rad
A 3.0-kg mass is released from rest at point A of a circular frictionless track of radius 0.40 m as shown in the figure. The mass slides down the track and collides with a 1.4-kg mass that is initially at rest on a horizontal frictionless surface. If the masses stick together, what is their speed after the collision?
A. 2.1 m/s B. 1.7 m/s C. 1.9 m/s D. 1.5 m/s E. 2.3 m/s
Liquid nitrogen at 77.2 K (its saturation temperature) and 100 kPa is in a well-insulated flask having a surface temperature of 100 K. Estimate the convection heat transfer coefficient between the liquid nitrogen and the flask surface. The critical pressure of nitrogen is 33.54 atm.
What will be an ideal response?