What is the quality of the sound of a fire truck's siren when it moves toward a stationary hearer?

If a car travels 30 mi. north for 30 min., 60 mi. east for 1.0 hour, and 30 mi. south for 30 min., what is the average speed of the car over the first two legs of the trip? 60 mph 50. mph 53 mph 53.3 mph

Suppose a cylindrical habitat in space 6.80 km in diameter and 24 km long has been proposed. Such a habitat would have cities, land, and lakes on the inside surface and air and clouds in the center.

If a baseball pitch leaves the pitcher's hand horizontally at a velocity of 150 km/h by what percent will the pull of gravity change the magnitude of the velocity when the ball reaches the batter, 18 m away?

A 26.0 g copper ring at 0°C has an inner diameter of D = 3.71382 cm. A hollow aluminum sphere at 83.0°C has a diameter of d = 3.72069 cm.

A 100 gram cylinder of copper initially at temperature of 200 degrees celsius immersed in 400 grams of water which is at 20 degrees celsius.

A Blu-ray disc is approximately 11 centimeters in diameter. The drive motor of a Blu-ray player is able to rotate up to 10,000 revolutions per minute. (a) Find the maximum angular speed (in radians per second) of a Blu-ray disc as it rotates

A body has translatory motion if it moves along a

What is Nothing. (sorry i have been wondering this for a very long time)

What is the weight of a 15kg dog on earth?

Identify the scenario below as to whether they increase, decrease, or not change the frequency in which a string vibrates and thus change its pitch. Assume that no other changes are happening. 1. Tightening a string for greater tension 2.