In Thompson's cathode ray tube experiements, the electrically charged plates are created by a constant applied voltage, which maintains a constant positive charge on one plate and a constant negative charge on the other. Normal household voltage alternates 60 time per second (also called 60 cycles/sec or 60 Hz) between 110 volts and -110 volts. In the apparatus depicted attached graphics, what would we expect to see on the CRT, as configured if the charged plates are plugged into a wall socket, which would switch the charge on the plates from positive to negative 60 times per second

If you touch a hot light bulb and get burned, that is an example of a. radiation b. convection c. conduction

1point) a skydiver weighing 130 lb (including equipment) falls vertically downward from an altitude of 14,000 ft and opens the parachute after 20 s of free fall. assume that the force of air resistance, which is directed opposite to the velocity, is of magnitude 0.85|v|0.85|v| when the parachute is closed and is of magnitude 17|v|17|v| when the parachute is open, where the velocity vv is measured in ft/s. assume that acceleration due to gravity has magnitude 32 ft/s/s; remember that weight is the product of mass and gravitational acceleration. find the speed of the skydiver when the parachute opens. speed is 150.6121788 ft/s find the skydiver's height when the parachute opens. height is 2338.98591 ft find the limiting velocity vlvl after the parachute opens. (think about whether this should be positive or negative.) vl=vl= 7.647 ft/s

A248-g piece of copper is dropped into 390 ml of water at 22.6 °c. the final temperature of the water was measured as 39.9 °c. calculate the initial temperature of the piece of copper. assume that all heat transfer occurs between the copper and the water. remember, the density of water is 1.0 g/m