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
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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
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
The expression(s) indicating the number of nucleons in a nucleus is
a. A. b. N. c. Z. d. Z + N. e. A – Z.
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