Which two of the following statements are true?
(a) the voltage source provides a constant voltage, a part of which, v1, drops off across resistor 1, and the remainder, v2, across resistor 2. hence v=v1+v2.
(b) the voltage drops v1 across resistor 1 and v2 across resistor 2 are the same, and they are independent of the values of r1 and r2. both v1 and v2 are equal to the voltage provided by the source. hence v=v1=v2.
(c)the current i provided by the voltage source splits: a part of it, i1, flows through resistor 1, while the remainder, i2, flows through resistor 2. hence i=i1+i2.
(d) the currents i1through resistor 1 and i2 through resistor 2 are the same, and they are equal to the current i provided by the source. hence i=i1=i2.

On a cold day, when the air temperature is 0°c, you empty your lungs and take a deep breath, filling your lungs with 4.2 l of air. if you hold your breath until the temperature of the air in your lungs reaches 37°c, what is the volume of the air in your lungs at that point, assuming the pressure does not change?

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

Calculate the work done by an external agent during an isothermal compression of 1.00 mol of oxygen from a volume of 22.4 l at 10∘c and 1.0 atm pressure to 16.8l