Physics Circular Motion Level: Misc Level
A hair dryer draws 8.4 A when plugged into a 1.2 V line.
a.What is its resistance?
b. How much charge passes through it in 15 min?
(Assume direct current.)
Physics Current Electricity Level: Misc Level
What voltage will produce 0.30 A of current through a 4.6 E 3 resistor?
Physics Current Electricity Level: Misc Level
A current of 2.30 A flows in a wire. How many electrons are flowing past any poin in the wire per second?
Physics Current Electricity Level: Misc Level
A 9.0 ohms resistor and a 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 12 V. Find the voltage output of the power supply. (b)The two resistors are connected in parallel across a power supply, and the current through the 9 ohms resistor is found to be.25 A. Find the voltage setting of the power supply.
Physics Current Electricity Level: Misc Level
At 40.0 C, the resistance of a segment 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?
Physics Current Electricity Level: Misc Level
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: Misc Level
Suppose an electron is released from rest in a uniform electric field whose strength is 5.90 x 10 to the 3 rd 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 Current Electricity Level: Misc Level
(a). How much charge is on each plate of a 4.00 - uF capacitor when it is connect to a 12. V battery (b) If this same capacitor is connected to a 1.50 V battery, what charge is stored?
Physics Current Electricity Level: Misc Level
A 1- megabit computer memory chip contains many 60.0 x 10 -15 F Capacitors. Each capacitor has a plate area of 21.0 x 10 - 12 m 2. Determine the plate separation of such a capacitor ( assume parallel plate configuration) The diamater of an atom is on the order of 10-10 m =1 A. Express the plate separation in angstroms.
Physics Rotational Mechanics Level: Misc Level
A square object with a circle cut in its center spins about its center of mass, with radius R. The object has mass M and the length of the edge of the square is 2 R. What is the moment of intertia for this object ? You may need M =( 4-pi ) pR 2 where p is the mass per unit area.
Physics Gravitation Level: Misc Level
A planet is a circular orbit around the sun. Use Newton s law of gravity and his second law of motion to calculate the period of the planet ( in day ). Data: Mass of sun =1.989 e+ 30 kg: Mass of planet =6.0 e + 24 kg:Orbit radius =1.496 e+11 m.
Physics Gravitation Level: Misc Level
M 1 is a spherical mass ( 35.0 kg ) at the origin. M 2 is also a spherical mass
( 14.8 kg ) and is located on the x- axis at x =68.2 m. At what value of x would a third mass with a 19. 0 kg mass experience no net gravitational force due to M 1 and M 2 ?
Physics Circular Motion Level: Misc Level
The flywheel of a steam engine begins to rotate from rest with a constant angular acceleration of 1.27 radians /s 2. It accelerates for 34.3 s, then maintains a constant angular velocity. Calculate the total angle through which the wheel has turned 51.1 s after it begins rotating.
Physics Work,Power & Energy Level: Misc Level
A 68.0 kg diver is 1.90 m above the water, falling at speed of 8.20 m /s. Calculate her kinetic energy as she hits the water. (Neglect air friction)
Physics Waves And Oscillations Level: Misc Level
Sunspots vary in number as a function of time, exhibiting an approximately 10.9 year cycle. Galileo made the first European observations of sunspots in 1610, and daily observations were begun in Zurich in 1749. At the present time (year 2003) we are just past the peak of the 23 rd observed cycle. what is the frequency of the sunspot cycle. Give your answer in Hz.
