A 56 kg bungee jumper jumps off a bridge and undergoes simple harmonic motion. If the period of oscillation is 11.2 s, what is the spring constant of the bungee cord, assuming it has negligible mass compared to that of the jumper?
A) 17.6 N/m
B) 21.1 N/m
C) 28.2 N/m
A
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Circular Motion of Charges: A doubly charged ion with speed 6.9 × 106 m/s enters a uniform 0.80-T magnetic field, traveling perpendicular to the field. Once in the field, it moves in a circular arc of radius 30 cm. What is the mass of this ion? (e = 1.60 × 10-19 C)
A. 11 × 10-27 kg B. 6.7 × 10-27 kg C. 3.3 × 10-27 kg D. 8.2 × 10-27 kg
A 2500 kg car accelerates up to a velocity of 30.0 m/s in 8.00 seconds. The work done by the engine to accelerate the car is
A. 
B. 
C. 
D. 
E. 
?Two flat rectangular mirrors are set edge to edge and placed perpendicular to a flat nonreflecting surface. A light ray that reflects from mirror 1 at angle?M1 then strikes the second mirror and reflects at?M 2 such that the angle between the ray reaching mirror 1 and the ray leaving mirror 2 is 180°. The angle between the two mirrors is
A. ?0°. B. ?45°. C. ?90°. D. ?150°. E. ?235°.
For a particular process where a fluid is being heated in a 2 inch (5.08 cm) diameter tube, the Nusselt number is predicted to be 45. If the fluid has a thermal conductivity of 1.5 Btu/hr·ft·ºF (2.6 W/mK) what is the predicted convective heat transfer coefficient?
What will be an ideal response?