Simple Harmonic Motion: An object is oscillating on a spring with a period of 4.60 s. At time t = 0.00 s the object has zero speed and is at x = 8.30 cm. What is the acceleration of the object at t = 2.50 s?
A. 1.33 cm/s2
B. 0.784 cm/s2
C. 11.5 cm/s2
D. 14.9 cm/s2
E. 0.00 cm/s2
Answer: D
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When a boat sails from fresh water to salt water, the boat will float
A) lower in the water. B) higher in the water. C) at the same water level.
A 6.0 kg box is held at rest by two ropes that form 30° angles with the vertical. An external force F acts vertically downward on the box. The force exerted by each of the two ropes is denoted by T
A force diagram, showing the four forces that act on the box in equilibrium, is shown in Figure 5.6. The magnitude of force F is 410 N. The magnitude of force T is closest to: A) 271 N B) 235 N C) 188 N D) 376 N E) 470 N
An amateur astronomer grinds a double convex lens whose surfaces have radii of curvature of 40 cm and 60 cm. The glass has an index of refraction of 1.54. What is the focal length of this lens in air?
A) 42.5 cm B) 126 cm C) 88.8 cm D) 44.4 cm E) 222 cm
The horizontal surface on which the block slides is frictionless. If F = 20 N and M = 5.0 kg, what is the magnitude of the resulting acceleration of the block?
a.
5.3 m/s2
b.
6.2 m/s2
c.
7.5 m/s2
d.
4.7 m/s2
e.
3.2 m/s2