A jogger hears a car alarm and decides to investigate. While running toward the car, she hears an alarm frequency of 868.5 Hz. After passing the car, she hears the alarm at a frequency of 843.5 Hz. If the speed of sound is 343 m/s. Calculate the speed of the jogger. (Express your answer to three significant figures.)

How is coal extracted from mountaintop removal mines? a. dynamite is used to create underground tunnels where miners go to extract the coal. b. dynamite is used to break apart rocks and then draglines are used to remove the broken rock and reach the coal. c. coal in mountaintops is extracted by digging strips in the landscape to reach the coal. d. placer deposits in mountain river bottoms are removed by

Science and technology are interdependent. advances in one lead to advances in the other. give an example of this phenomenon.

A1,700kg car is being used to give a 1,400kg car a push start by exerting a force of 140n the impulse on the smaller car during the 30.0s of contact is +670kg*m/s. what is the impulse of the smaller car on the larger car? -814 kg*m/s 0kg *m/s -670kg*m/s -550kg*m/s