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Part 1. Nerve cells transmit electric signals through their long tubular axons. These signals propagate due to a sudden rush of Na+ ions, each with charge +e, into the axon. Measurements have revealed that typically about 5.4Af-1011 Na+ ions enter each meter of the axon during a time of 13 ms . What is the current during this inflow of charge in a meter of axon? Express your answer using two significant figures.
Part 2. A refrigerator draws 3.8 A of current while operating on a 120 V power line. If the refrigerator runs 50 % of the time and electric power costs $0.12 per kWh, how much does it cost to run this refrigerator for a 30-day month? Express your answer using two significant figures.
Part 3. Multiple Choice : A resistor R and another resistor 2.00 R are connected in parallel across a battery. If heat is produced at a rate of 16.0 W in R, in 2.00 R it is produced at a rate of
A) 64.0 W .B) 32.0 W .C) 16.0 W .D) 8.00 W .
A very large loop of metal wire with radius 1meter is driven with a linearly increasing current at a rate of 200amps/second. What is the separation between the loops
An engine moves a boat throughthe water at a constant speed of 15 m/s. What power does the engine develop
Two point charges of +20.0 ?C and -8.00 ?C are separated by a distance of 20.0 cm. What is the intensity of electric field E midway between these two charges
If in joule's paddlewheel experiment a block of mass 10 kilogram is allowed to fall through 22.5 m and the mass of the water is 50 g. Determine the total increase in temperature of the water
A ball is thrown vertically upward on the moon and returns to its starting point in 4 sec. Acceleration on the moon is 1.6m/s2 downward. Find the balls original speed
A falling skydiver has a mass of 109 kg. What is the magnitude of the skydiver's acceleration
An 271 N object is moving to right when forces act on it Two forces act in + y direction (up) 32 N and 17 N One force acts in down , -y, direction 20N Two forces act to right , +x, direction 18 N and 26N, Determine the net force on the particle
A transformer has a primary coil with 1200 turns and a secondary coil with 225.0 turns. what is the voltage output from the secondary coil
A person weighs 836 N in air and has a body fat percentage of 20.5%. What is the overall density of this person's body
two guns a and b located at xa 0 and xb 1.5 km fire at an approaching rocket. gun a fires at t 0 gun b fires at t
A proton is traveling horizontally to the right at 4.20×10^6 m/s . Discover (a) the magnitude and (b) direction of the weakest electric field that can bring the proton uniformly to rest over a distance of 3.10cm.
The coefficient of static friction between a rope and the table onwhich it rests is \mu _{\rm{s}}. Find the fraction of the rope that can hangover the edge of the table before it begins to slip. Express your answer in terms ofmu_s.
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