Which statement is true a. the speed of sound in air is inversely proportional to the temperature of the air b. the speed of sound in air is directly proportional to the temperature of the air c. the speed of sound in air is twice the temperature of the air d. the speed of sound is not affected by the temperature of the air

The astronauts on the space shuttle flights experienced an acceleration of 29 m/s2 (about 3 "g's") during lift-off. what upward force must the astronaut's seat apply to the astronaut in order to cause this acceleration? assume the astronaut's mass is 70 kg, and compute this force when the acceleration is near the earth's surface so their weight equals latex: mg m g .