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 in airis not affected by the temperature of the air.

Aspring with a mass of 2 kg has a damping constant 14 kg/s. a force of 3.6 n is required to keep the spring stretched 0.3 m beyond its natural length. the spring is stretched 0.6 m beyond its natural length and then released. find the position of the mass at any time t. (assume that movement to the right is the positive x-direction and the spring is attached to a wall at the left end.)

Avector a⃗ has a length of 8.6 m and points in the negative x direction. find the x component of the vector −3.7a⃗ .

An elevator is initially moving upward at a speed of 12.60 m/s. the elevator experiences a constant downward acceleration of magnitude 3.60 m/s2 for 2.97 s.