How do I solve question 9 in excel?

between volume (ordinate) and torus radius (R) for tube radii (r) of 40, 70, and 100 centimeters. 9. Generally, when a car door is opened, the interior lights come on and turn off again when the door is closed. Some cars turn the interior lights on and off gradually. Suppose that you have a car with 25 watts of interior lights. When a door is opened, the power to the lights increases linearly from 0 to 25 watts over 2 seconds. When the door is closed, the power is reduced to zero in a linear fashion over 5 seconds. a. Create a proper plot of power (P, on the ordinate) and time (t). b. Using the graph, determine the total energy delivered to the interior lights if the door to the car is opened and then closed 10 seconds later. 10. One of the 22 named, derived units in the metric system is the volt, which can be expressed as 1 joule per coulomb (V J/C). A coulomb is the total electric charge on approximately 6.24 x 1018 electrons. The voltage on a capacitor is given by