A baseball is hit almost straight up into the air with a speed of about 20 m s.
(a) How high does it go?
(b) How long is it in the air?
Ans: 
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What did Einstein show to be equivalent to energy?
A: Light B: Mass C: Protons D: Temperature E: Velocity
A parallel plate capacitor is constructed with Teflon (dielectric constant 2.1 ) between the plates. This 12.6 ?F capacitor has been charged to 1.5 volts. The Teflon is then pulled out (removed)
(a) What charge was originally stored? (b) After removing the Teflon, what potential is across the plates?
Which of the following statements about Gauss's law are correct? (There may be more than one correct choice.)
A) Gauss's law is valid only for symmetric charge distributions, such as spheres and cylinders. B) If there is no charge inside of a Gaussian surface, the electric field must be zero at points of that surface. C) Only charge enclosed within a Gaussian surface can produce an electric field at points on that surface. D) If a Gaussian surface is completely inside an electrostatic conductor, the electric field must always be zero at all points on that surface. E) The electric flux passing through a Gaussian surface depends only on the amount of charge inside that surface, not on its size or shape.
A piece of copper of mass 110 g is being drilled through with a 1/2" electric drill. The drill operates at 25.0 W and takes 25.0 s to bore through the copper. If all the energy from the drill heats the copper, find the copper's increase in temperature. ccopper = 387 J/kg/°C
a. 18.4 C° b. 23.5 C° c. 14.7 C° d. 22.0 C° e. 29.4 C°