Astate trooper chases a speeder along a straight road; with vehicles move at 160 km/h. the siren on the trooperâs vehicle produces sound at a frequency of 500 hz. what is the doppler shift inthe frequency heard by the speeder

Since both the speeder and the state trooper are moving at the same speed and same direction, therefore there would be no or zero Doppler shift.

In order to have a Doppler shift, the distance or separation between the state trooper and the speeder must also be changing with time. Which in this case, the distance remains the same or constant since they are moving alike. This is just like what would occur if they were both standing still or parked.

answer; equivalent to a one(1) horsepower motor;

answer: the metamorphic rocks are formed when they are exposed to high pressure and high temperatures. this happens when one of the earth's plates comes in contact with the other plate by traveling in opposite directions, straight into each other or slipping under one another. the friction that is caused by this activity results in   melting of rocks and when it cools they are known as metamorphic rocks. this process needs a controlled amount of pressure and temperature otherwise it may turn into magma.