Two trucks with sirens move toward you from opposite directions, each emitting a 1000 Hz sound. Truck 1 moves at 20 m/s and truck 2 moves at a slower speed. The speed of sound is 340 m/s. 16. You are stationary and observe a beat frequency of 26 Hz from the two sounds. How fast is truck 2 moving

Athin plate moves between two parallel, horizontal, stationary flat surfaces at a constant velocity of v = 7.5 m/s. the two stationary surfaces are spaced 4 cm apart, and the medium between them is filled with oil whose viscosity is 0.9 n·s/m2. the part of the plate immersed in oil at any given time is 2 m long and 0.5 m wide. if the plate moves through the mid-plane between the surfaces, determine the force required to maintain this motion. what would your response be if the plate was 1 cm from the bottom surface (h2) and 3 cm from the top surface (h1)? if the plate moves through the mid-plane between the surfaces, the force required to maintain the motion will be n. if the plate was 1 cm from the bottom surface (h2) and 3 cm from the top (h1) surface, the force required to maintain the motion would be n.

Work out sian speed for the first 30 minutes of her journey. give your answer in km/h.

What is the temperature in degrees celsius of a substance with a tempature of 49k