Physics Answers

A 9.0 V battery supplies 1.4 A to a 6.0 Ω resistor. What is the terminal voltage of the battery?   

An electrolytic capacitor is charged to 15 V when a constant current of 1.0 A is passed through it for 30 µs. What is the value of its capacitance?     

Determine the total capacitance if a 30 pF capacitor is connected in series with 0.03µF  capacitor. 

What unit is the rate of flow of electrical charge and is measured in Coulomb per second.

Which diode approximation

a. treats a reverse-biased diode like an open switch with

zero current?

b. includes the high leakage resistance when the diode

is reverse-biased?

A 3000 kg elevator rises from rest in the basement to the floor. A distance of 25m . As it passes the fourth floor it's speed is 3 m/s . There's a constant frictional force of 500N. Calculate the work by the lifting mechanism?

Roger sees water balloons fall past his window. He notices that each balloon strikes the sidewalk 0.59 s after passing his window. Roger's room is on the second floor, 10 m above the sidewalk.

How fast are the balloons traveling when they pass Roger's window?

Assuming the balloons are being released from rest, from what floor are they being released? Each floor of the dorm is 5.0 m high.

The position of a stone dropped from a cliff is described approximately by x = 5t^2 , where x is in meters and t is in seconds. The +x direction is downwards and the origin is at the top of the cliff. Find the velocity of the stone during its fall as a function of time t.

Calculate the magnitude and direction of the electric field 0.45 m from a +7.85 x 10–9 C point charge.

Roger sees water balloons fall past his window. He notices that each balloon strikes the sidewalk 0.59 s after passing his window. Roger's room is on the second floor, 10 m above the sidewalk.

How fast are the balloons traveling when they pass Roger's window?

Assuming the balloons are being released from rest, from what floor are they being released? Each floor of the dorm is 5.0 m high.