Two batteries are used to light a bulb as shown. A third identical battery is connected by closing switch S. What happens to the bulb?
3
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A 16-? platinum wire at 20°C with a temperature coefficient of resistivity of 3.9 × 10^?3 (°C)?1 will have what resistance at 80°C?
a. 12 ? b. 13 ? c. 20 ? d. 16 ? e. 3.7 ?
Which form of electromagnetic radiation is absorbed by carbon dioxide and water vapor in our atmosphere?
A) visible light B) ultraviolet C) infrared D) radio E) gamma rays
Mixtures can be separated into their components by taking advantage of differences in the chemical properties of the components
Why might this separation method be less convenient than taking advantage of differences in the physical properties of the components? A) A chemical property involves a chemical change so that you no longer have what you had. B) Chemical properties are not as apparent as are physical properties. C) The chemical properties of the components of a mixture are too similar to each other. D) The chemical properties of the components of a mixture are too different from each other.
A mass m = 4.7 kg hangs on the end of a massless rope L = 2.05 m long. The pendulum is held horizontal and released from rest.
1) How fast is the mass moving at the bottom of its path?
2) What is the magnitude of the tension in the string at the bottom of the path?
3) If the maximum tension the string can take without breaking is Tmax = 382N, what is the maximum mass that can be used (Assuming that the mass is still released from the horizontal and swings down to its lowest point.)
4) Now a peg is placed 4/5 of the way down the pendulum's path so that when the mass falls to its vertical position it hits and wraps around the peg. As it wraps around the peg and attains its maximum height it ends a distance of 3/5 L below its starting point (or 2/5 L from its lowest point). How fast is the mass moving at the top of its new path (directly above the peg)?
5) Using the original mass of m = 4.7 kg, what is the magnitude of the tension in the string at the top of the new path (directly above the peg)?
