An experiment measures the temperature, T, of a wire as a function of the current, I, passing through the wire. Which one of the following statements will be TRUE when drawing an x-y graph of the data? |
The velocity, v, of a car accelerating at a uniform rate is given by the equation: v = 8.4 + at where a is the acceleration (ms^{-2}) and t is the time (s). If the velocity of the car is 12.9 ms^{-1} when t = 9 s, calculate its velocity when t = 20 s. |
A well insulated oven is turned on at time, t = 0 sec and is initially at a temperature, T_{0} = 290 K, and after 5 minutes (t = 300 sec), it reaches a temperature, T_{300} = 440 K. Assuming that the temperature, T_{t}, rises linearly with time, t, calculate (to 3 significant figures) the rate of increase, m, of the temperature with with time. |
A straight line graph is plotted of the voltage, E, (on the y-axis) from a particular pH electrode at a fixed temperature as a function of the pH (on the x-axis) of a solution, and it is found that when pH = 6.5 the voltage, E = 25 mV, and when pH = 10.0 the voltage, E = -182 mV. Calculate (to 3 significant figures) the rate of change of voltage, E, with pH. |