The date of September 22 or 23 is the

A. autumnal equinox.

B. winter solstice.

C. summer equinox.

D. autumnal solstice.

You and your fellow students have been challenged to design a rubber band powered car. You will use the elastic potential energy of the rubber band to move the car a distance. The car that moves the greatest distance is the winner of the challenge.

Suppose the Earth orbited the Sun in 4 months rather than 1 year, but had exactly the samerotation speed. How much longer would a solar day be than a sidereal day? Mercury's siderealday is 58.6 days and its orbital period is 88 days.

You hear sounds at the following decibel levels: 5 dB, 10 dB, 20 dB, and 40 dB. Which sound is 10 times higher than the lowest pressure humans can hear? 40 dB 10 dB 20 dB 5 dB

The length of each of the bonds between the atoms of a molecule of nitrogen (n2) is 0.0465 nm. the mass of a nitrogen atom is 2.32 * 10-11 pg.

What's the relationship between the starting height of a ball and the height of its first bounce?

2. What other physical quantity might be more important to weightlifters than how much actual work they do?

A minibus drives 212 km in 2 hours 10 minutes. What is its average speed in kilometers per hour?

What is the charge of plasma? A. Positive B. Negative C. Neutral

Examine the situation. Lloyd is studying the effect of breakfast cereal on the health of rats. He suspects that the cereal may be unhealthy. He feeds rats various amounts of breakfast cereal over a six-week period.

An electron travels into a 0.5 T magnetic field perpendicular to its path, where it moves in a circular arc of diameter 0.028 m. What is the kinetic energy of the electron?