PSYW - Please Show Your Work Mac and Tosh are on a roller coaster ride and moving rapidly over the crest of a small
hill. The hilltop has a curve that resembles a section of a circle with a radius of 40
meters. The speed of the 470-kg roller coaster car at the crest is 15 m/s.

Determine the acceleration (in m/s2), net force (in N), and the magnitudes of all
individual forces when the car is at the crest.
Finally, indicate the direction of the net force and acceleration. Use g = 9.80 m/s2

In which situation has the independent variable for the experiment been changed? check all that apply. changed from counting the number of duckweed at day 0 and day 14 to counting them every day changed from testing duckweed growth in beakers to testing duckweed growth in large outdoor tanks changed from testing the effect of ph on duckweed growth to testing the effect of light levels on duckweed growth changed from testing the effect of acid ph on duckweed growth to testing the effect of basic ph on duckweed growth

Aplane travels 1000 miles in 5 hours .what is the planes average speed?

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