An ambulance travels down the highway at a speed of 128 km/h. Its siren emits a sound at a frequency of 925 Hz. A car traveling at 75 km/h is on the other side of the highway (it is moving in the opposite direction). The speed of sound in air is 343 m/s. (A) What is the frequency of the siren heard by a passenger in the car as the car and ambulance approach each other? (B) What is the frequency of the siren heard by a passenger in the car as the car and ambulance move away from each other?

Infrared rays have a shorter wavelength than question 11 options: x-rays. ultraviolet rays. radio waves. gamma rays.

By what factor does the drag force on a car increase as it goes from 65 to 110 km/h?

Astone is thrown with a speed v0 and returns to earth, as the drawing shows. ignore friction and air resistance, and consider the initial and final locations of the stone. which one of the following correctly describes the change δpe in the gravitational potential energy and the change δke in the kinetic energy of the stone as it moves from its initial to its final location? options a.δpe = 0 j and δke = 0 j b.δpe is positive and δke is negative c.δpe = 0 j and δke is positive d.δpe is negative and δke is positive e.δpe = 0 j and δke is negative