A hiker shouts toward a vertical cliff 685 m away. The echo is heard 4.00 s later. What is the speed of the sound in this air?
a 253.6 m/s
b 423.8 m/s
С .
342.5 m/s

Suppose a comet has an orbital period of 309.1 years around the sun. what is it’s average distance from the sun?

Greg drew a diagram to compare two of the fundamental forces. which labels belong in the areas marked x, y and z? gravitational force electromagnetic force x. attractive y repulsive z: infinite range x: infinite range y attractive z. repulsive x. always attractive y: infinite range z: attractive or repulsive x. attractive or repulsive y infinite range z: always attractive

Ain is , is 's of ? 0.62 0.79 1.27 1.50