Physics Electrostatics Level: High School
Determine the electric field strength at a point 1.00 cm to the left of the middle charge shown in the figure at “click here”If a charge of -2.00uC is placed at this point , what are the magnitude and direction of the force on it ? There are three charges ; 6.00 uC with 3.00 cm distance from the next charge of 1.50uC and then 2.00cm to the next charge-2.00uC .
Physics Electrostatics Level: High School
An uncharged capacitor and a resistor are connected in series to a source of emf. If E = 9.00V, C = 20.0 uF , and R = 100 ohms , find(a) The time constant of the circuit
(b) The maximum charge on the capacitor
(c) The charge on the capacitor after one time constant
Physics Current Electricity Level: High School
A 9.0 ohms resistor and 6.0 ohms resistor are connected in a series with a power supply .(a) The voltage drop across the 6.0 ohms resistor is measured to be 12V . Find the voltage output of the power supply
(b) The two resistor are connected in parallel across a power supply , and the current through the 9 ohms resistor is found to be .25A . Find the voltage setting of the power supply
Physics Electrostatics Level: High School
A potential difference of 12V is found to produce a current of 40.0 A in a 3.2-m length of wire with a uniform radius of .40 cm . What is(a) The resistance of the wire ?
(b) The resistivity of the wire ?
Physics Electrostatics Level: High School
At 40.0 C , the resistance of a segment of gold wire is 100.0 ohms . When the wire is placed in a liquid bath , the resistance decreases to 97.0 ohms . What is the temperature of the bath ? Hind : First determine the resistance of the gold wire at room temperature , 20 degree C .
Physics Electrostatics Level: High School
If a silver wire has a resistance of 10.0 ohms at 20.0 C , what resistance does it have at 40.0 C ? Neglect any change in length or cross-sectional area resulting from the change in temperature ?
Physics Electrostatics Level: High School
Suppose an electron is released from rest in a uniform electric field whose strength is 5.90 x 10 to the 3rd V/m .(a) Through what potential difference will it have passed after moving 1.00 cm ?
(b) How fast will the electron be moving after it has traveled 1.00 cm ?
Physics Electrostatics Level: High School
(a) How much charge is on each plate of a 4.00 micro F capacitor when it is connected to a 12.V battery
(b) If this same capacitor is connected to a 1.50V battery . What charge is stored ?
Physics Electrostatics Level: High School
A 1megabit computer memory chip contains many 60.0 x 10 -15 F Capacitors . Each capacitor has a plate area of 21.0 x 10 – 12m2 . Determine the plate separation of such a capacitor (assume parallel plate configuration ) The diameter of an atom is on the order of 10-10m =1A . Express the plate separation in angstroms .
Physics Electrostatics Level: High School
The dome of a Van de Graff generator receives a charge of 2.0 x 10 -4C . Find the strength of the electric field(a) Inside the dome;
(b) at the surface of the dome , assume it has a radius of 1.0m ;
(c) 4.0 m from the center of the dome
Hint . Review properties of conductors in electrostatic equilibrium . Also use the fact that the points on the surface are outside a spherically symmetric charge distribution ; the total charge may be considered as located at the center of the sphere .
Physics Kinematics Level: High School
Equation of Motion
A ranger in a national park is driving at 27.4 mi/hr when a deer jumps into the road 215 ft ahead of the vehicle . After a reaction time of t the ranger applies the brakes to produce an acceleration of -8.96 ft/ s^2 . What is the maximum reaction time allowed if she is to avoid hitting the deer ? Answer in units of s .
Physics Kinematics Level: High School
Relative Velocity
A car capable of constant acceleration of 1.53 m/s^2 is stopped at a traffic light . When the light turns green, the car starts from rest with this acceleration . At the very same moment, a truck trveling with constant velocity 19 m/s(42.5018 mi/hr) passes the car. As the cars velocity increases ,it will eventually move faster than the truck and later overtake it. How far from the light will the car catch up with the truck ? Answer in units of m
Physics Waves And Oscillations Level: High School
Sound
A sound wave traveling at 320 m/s , is emitted by the foghorn of a tugboat . An echo is heard 3.29 s later. How far is the reflecting object ? Answer in units of m .
Physics Dimensions Level: High School
. s is a distance with unit (L) , t is a time with unit (T)and theta is an angle in radians what is the required dimension for the quantity C5 in the expression theta symbol = s/C5 (ors over C5) ?
Physics Dimensions Level: High School
s is a distance with unit (L) , t is a time with unit (T)and theta is an angle in radians What is the required dimension for the quantity C4 in the expression s = C3 cos (C4 t) ?