A positively charged ping pong ball is sitting stationary on the floor in the center of a room. There is also a constant, uniform magnetic field in the room that points toward the ceiling. If I now start the ball rolling toward the back of the room, the resultant motion of the ball, as observed from the ceiling, will be
A. a diagonal straight line toward the left back corner of the room.
B. a straight line in the original direction of motion.
C. a diagonal straight line toward the right back corner of the room.
D. a horizontal, counterclockwise circle.
E. a horizontal, clockwise circle.
Answer: E
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A rectangular plate (a 5 120 mm, b 5 160 mm) is subjected to compressive stress ?x 5 24.5 MPa and tensile stress ?y 5 15 MPa. The ratio of the normal stress acting perpendicular to the weld to the shear stress acting along the weld is approximately:
(A) 0.27
(B) 0.54
(C) 0.85
(D) 1.22
A 200 g hockey puck is launched up a metal ramp that is inclined at a 30° angle
The coefficients of static and kinetic friction between the hockey puck and the metal ramp are ?s = 0.40 and ?k = 0.30, respectively. The puck's initial speed is 63 m/s. What vertical height does the puck reach above its starting point? A) 130 m B) 270 m C) 200 m D) 66 m
A resistor with a resistance of 360 ? is in a series circuit with a capacitor of capacitance 7.3 × 10-6 F
What capacitance must be placed in parallel with the original capacitance to change the capacitive time constant of the combination to three times its original value?
In a parallel RLC circuit, where IR = IR, max sin(?t), the current through the capacitor, IC, is
a. IC = ?IC, max sin(?t). b. IC = IC, max sin(?t). c. IC = ?IC, max cos(?t). d. IC = IC, max cos(?t). e. IC = IC, max tan(?t).