A spring (k = 200 N/m) is suspended with its upper end supported from a ceiling. With the spring hanging in its equilibrium configuration, an object (mass = 2.0 kg) is attached to the lower end and released from rest. What is the speed of the object after it has fallen 4.0 cm?

a. 90 cm/s
b. 79 cm/s
c. 96 cm/s
d. 83 cm/s
e. 57 cm/s


b

Physics & Space Science

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A star that is twice the mass of our Sun would have a habitable zone that:

a) includes Mars but not the Earth b) includes Venus but not the Earth c) includes Neptune only d) includes both Venus and the Earth e) includes Mercury only

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The expression(s) indicating the number of nucleons in a nucleus is

a. A. b. N. c. Z. d. Z + N. e. A – Z.

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A 25-?F capacitor charged to 50 V and a capacitor C charged to 20 V are connected to each other, with the two positive plates connected and the two negative plates connected. The final potential difference across the 25-?F capacitor is 36 V. What is the value of the capacitance of C?

a. 43 ?F b. 29 ?F c. 22 ?F d. 58 ?F e. 63 ?F

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A design requires a material that must operate up to a temperature of 300°C (572°F), have a high resistance to deformation, a high strength, a high resistance to fracture, and a low cost. Which of the following materials is most likely to best satisfy the design requirements?

(a) Alumina ceramic (b) Low-carbon steel (c) Polyethylene (d) Graphite-reinforced epoxy

Physics & Space Science