A circuit consists of a series combination of 5.50 −kΩ and 5.00 −kΩ resistors connected across a 50.0-V battery having negligible internal resistance. You want to measure the true potential difference (that is, the potential difference without the meter present) across the 5.00 −kΩ resistor using a voltmeter having an internal resistance of 10.0 kΩ.

Part A
What potential difference does the voltmeter measure across the 5.00 −kΩ resistor?
Part B
What is the true potential difference across this resistor when the meter is not present?
Part C
By what percentage is the voltmeter reading in error from the true potential difference?

The passing of heat through a material while the material itself stays in place. a. radiation b. conduction c. convection

You are driving directly behind a pickup truck, going at the same speed as the truck. a crate falls from the bed of the truck to the road. (a) will your car hit the crate before the crate hits the road if you neither brake nor swerve? (b) during the fall, is the horizontal speed of the crate more than, less than, or the same as that of the truck?

As you are trying to move a heavy box of mass m, you realize that it is too heavy for you to lift by yourself. there is no one around to , so you attach an ideal pulley to the box and a massless rope to the ceiling, which you wrap around the pulley. you pull up on the rope to lift the box. use g for the magnitude of the acceleration due to gravity and neglect friction forces. once you have pulled hard enough to start the box moving upward, what is the magnitude f of the upward force you must apply to the rope to start raising the box with constant velocity? express the magnitude of the force in terms of m, the mass of the box.