A crow flies forward and backward. Its motion is shown on the following graph of horizontal position x vs. time t. What is the instantaneous velocity of the crow at t= 9 s?

Two technicians are discussing a resistance measurement between the can-h and can-l wires. technician a says this measurement should be done with the ignition switch in the "run" position. technician b states that a measurement of 0 ohms indicates an open in the network. which technician is correct?

However, had it been a real sound, the sound's pitch would have been increased by the doppler effect, since the falcon was moving the source of the sound. perpendicular to away from towards at the same speed as

In which of the following is positive work done by a person on a suitcase