15 points) Submarine sonar cannot only locate another ship nearby. It can also tell how fast it is going. Sub A at all stopped emits a sonar pulse in a burst of 850 Hz sound. The pulse reflects off the hull of another submarine, sub B which is moving along a course that is in line with sub A. The returning frequencyis higher andbeats against the original pulse with a beat frequency of 2.5 Hz. How fast is the sub B moving

Which of the following changes will result in a stronger electromagnet? a. using fewer coils of wire b. using a higher voltage c. using a shorter nail d. using a longer wire

The coefficient of friction is a number that represents the resistance to sliding between two in contact with one another.

Asilver dollar is dropped from the top of a building that is 1324 feet tall. use the position function below for free-falling objects. s(t) = −16t2 + v0t + s0 (a) determine the position and velocity functions for the coin. s(t) = v(t) = (b) determine the average velocity on the interval [1, 2]. ft/s (c) find the instantaneous velocities when t = 1 second and t = 2 seconds. v(1) = ft/s v(2) = ft/s (d) find the time required for the coin to reach the ground level. (round your answer to three decimal places.) t = s (e) find the velocity of the coin at impact. (round your answer to three decimal places.) ft/s