19. A stone dropped from a cliff hits the ground 3.5 seconds later. A second rock is thrown horizontally from the same cliff and lands 24.5 meters from the base.
a. Find the height of the cliff
b. Find the initial velocity of the thrown rock

Aresistor with an unknown resistance is connected in parallel to a 9 ω resistor. when both resistors are connected in parallel to an emf source of 21 v, the current through the unknown resistor is measured with an ammeter to be 4 a. what is the resistance of the unknown resistor? answer in units of ω.

You can watch static electricity in action by rubbing an inflated balloon against your hair. your hair will actually stand on its end! it does this because each hair becomes charged, and they all repel one another.

At what time would the magnitude of the velocity reach 36.00 km/hr