20 points :) pls answer correctlyy A 70.0 kg skydiver has a weight of 686 N. Just before opening the parachute, they experience 300 N of air resistance. Use F = ma to determine how much are they currently accelerating?

9.8 m/s^2 down
7.6 m/s^2 down
5.5 m/s^2 down
3.8 m/s^2 down

After a big snowfall, you take your favorite rocket-powered sled out to a wide field. the field is 195 m across, and you know that your sled accelerates at a rate of 3.65 m/s2 when the rocket is on. how much time will it take the sled to cross the field starting from rest, assuming the rocket is on the whole time?

You have a resistor and a capacitor of unknown values. first, you charge the capacitor and discharge it through the resistor. by monitoring the capacitor voltage on an oscilloscope, you see that the voltage decays to half its initial value in 2.70 miss . you then use the resistor and capacitor to make a low-pass filter. what is the crossover frequency fc?

Which of the following is a measure of the amount of light a star directly emits?               a.  luminosity    b.  intensity    c.  wavelength    d.  brightness