Simple Harmonic Motion: The equation of motion of a particle undergoing simple harmonic motion in the y direction is y = (2.0 cm) sin(0.60 s-1 t). At time t = 0.60 s determine the particle's (a) position, (b) velocity, and (c) acceleration.
What will be an ideal response?
(a) 0.70 cm (b) 1.1 cm/s (c) -0.25 cm/s2
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Lens-Maker Formula: An amateur astronomer grinds a double convex lens whose surfaces have radii of curvature of magnitudes 40 cm and 60 cm. The glass has an index of refraction of 1.54. What is the focal length of this lens when used in the night air?
A. 43 cm B. 130 cm C. 89 cm D. 44 cm E. 220 cm
Conduction: A concrete wall of a cold storage room measures 3.0 m high, 5.0 m wide, and 20 cm thick. The inside wall is to be covered by a layer of wood in order to reduce the rate of heat flow through the wall by 90 percent. The inner surface of the wooden wall is maintained at -10°C and the outer surface of the concrete wall is at 20°C. The thermal conductivities of concrete and wood are 0.80 W/m ? K (concrete) and 0.040 W/m ? K (wood). What should be the thickness of the layer of wood?
A. 60 mm B. 70 mm C. 80 mm D. 90 mm E. 100 mm
Apparent weightlessness can be experienced in freely falling elevator
Indicate whether the statement is true or false
Does Hubble's law work well for galaxies within the Local Group? Why or why not?
A) no, because galaxies in the Local Group are gravitationally bound together B) no, because Hubble did not know the Local Group existed when he discovered his law C) no, because we do not know the precise value of Hubble's constant D) Yes, it works so well that we have never detected any measurable deviations from its predictions.