A metal rod of length L in a region of space where a constant magnetic field points into the page rotates clockwise about an axis through its center at constant angular velocity ?. While it rotates, the point(s) at lowest potential is(are)
A. A.
B. B.
C. C.
D. D.
E. A and E.
Answer: C
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Two different materials are in contact as shown in the figure. Determine the temperature distribution through the two materials after 10 minutes using a 1 inch grid as shown.
Suppose that, as you sit in your classroom, you see two balls fall to the floor and hit at exactly the same time
According to the theory of relativity, other people sitting in the classroom with you will not agree that the balls hit the floor at the same time. Indicate whether the statement is true or false
A horizontal plank (m = 2.0 kg, L = 1.0 m) is pivoted at one end. A spring (k = 1.0 × 103 N/m) is attached at the other end, as shown in the figure. Find the angular frequency (in rad/s) for small oscillations.
?
?
A. 39 B. 44 C. 55 D. 66 E. 25
A DC motor of internal resistance 6.0 ? is connected to a 24-V power supply. The operating current is 1.0 A
(a) What is the start-up current? (b) What is the back emf when the motor is running at full speed? (c) What is the back emf when the motor is running at half speed?