In a new lab experiment, two parallel vertical metal rods are separated by l = 1.4 m . a r = 2.0-ω resistor is connected from the top of one rod to the top of the other. a m = 0.18-kg horizontal metal bar falls between the rods and makes contact at its ends with the rods. a b→field of 0.50×10−4 t points horizontally between the rods. the bar should eventually reach a terminal falling velocity (constant speed) when the magnetic force of the magnetic field on the induced current in the bar balances the downward force due to the gravitational pull of the earth.

1)

develop in symbols an expression for the current through the bar as it falls.

express your answer in terms of the variables r, b, l, and terminal falling velocity v.

How are calculation for velocity and speed different

Explain the difference between each pair of concepts. a. frequency and relative frequency b. percentage and relative frequency a. select the correct choice below. a. frequency is the total number of observations in a data set. relative frequency is the number of times a particular distinct value occurs. b. frequency is the number of times a particular distinct value occurs. relative frequency is the ratio of the frequency of a value to the total number of observations. c. frequency is the total number of observations in a data set. relative frequency is the ratio of the number of times a particular distinct value occurs to the frequency. d. frequency is the number of times a particular distinct value occurs. relative frequency is the ratio of the frequency of two different values.

Immediately upon reaching its lowest point, a falling pendulum bob has its greatest amount of energy, which is the initial amount of potential energy. a. heat; less than b. heat; more than c. kinetic; less than d. kinetic; more than