Which must exist for electric charges to flow?

Which of the following is true of friction? A friction makes motion possible on Earth. B. friction has mass and can be held. C. friction is always equal to velocity

A technician A says that a voltmeter can be used to monitor the output signal of an optical sensor. Technician B says that optical sensors should be tested with an oscilloscope because of the sensor's speed. Which technician is correct?

What is the definition of luminosity

Centripetal acceleration occurs because an object is Select one: a. slowing down. b. changing direction. c. speeding up. d. none of these choices.

A car moves with a speed of 30 metres per second calculate the distance travelled in 30 seconds

Waves on a pond are an example of which kind of wave? a. sound b. surface c. deep water d. non-mechanical

A freight train traveling with a velocity of - 4. o m/s begins backing into a train yard. if the train's average acceleration is - 0.27 m/s^2 what is the trains velocity after 17s

A current of 19.5 mA is maintained in a single circular loop with a circumference of 2.30 m. A magnetic field of 0.710 T is directed parallel to the plane of the loop. What is the magnitude of the torque exerted by the magnetic field on the loop?

A zero on the kelvin temperature scale is called "absolute zero." a. true b. false

Calculate the speed of a wave on a guitar string which has a mass of 55 g and a length of 30 cm if the tension in the string is 200 N