The figure shows a sound wave as a function of time when the source is stationary with respect to the observer. Which shows the perceived sound wave heard by a stationary observer when the source moves toward the observer?

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?

Imagine that someone pushes one marble toward a motionless marble. would there still be action-reaction forces involved in the collision? how might the marbles’ motions be changed? ?

In the first law of thermodynamics, triangle e=q-w, what does q stand for