The number of nodes, including the end points, in a standing wave that is three wavelengths long is
A) 4.
B) 5.
C) 6.
D) 7.
E) none of the above
Answer: D
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Inelastic Collisions: A 1200-kg car moving at 15.6 m/s suddenly collides with a stationary car of mass 1500 kg. If the two vehicles lock together, what is their combined velocity immediately after the collision?
A. 6.9 m/s B. 8.6 m/s C. 12.1 m/s D. 5.5 m/s
Components: The components of vectors 
and 
are given as follows: Bx = -9.2 Cx = -4.5 By = -6.1 Cy = 4.3The angle (less than 180°) between vectors 
and 
is closest to
A. 77°. B. 103°. C. 10°. D. 170°. E. 84°.
A 50-kg child riding a Ferris wheel (radius = 10 m) travels in a vertical circle. The wheel completes one revolution every 10 s. What is the magnitude of the force on the child by the seat at the highest point on the circular path?
a. 0.29 kN b. 0.49 kN c. 0.69 kN d. 0.20 kN e. 0.40 kN
Compton Scattering: If the scattering angle of the light in Compton's scattering experiment is 90°, what is the change in the wavelength of the light? (melectron = 9.11 × 10-31 kg, c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s)
A. 1.22 × 10-12 m B. 2.42 × 10-12 m C. 3.65 × 10-12 m D. 4.85 × 10-12 m