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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 .
The coefficient of static and kinetic frictions between a 3 kg box and a desk are .4 and .3 respectively. What is the net force on the box when a 10 N horizontal force is applied to the box
A soccer ball of mass 1.5 kg and radius 15 cm rolls down a 35degree incline that is 6.0 m high, How fast is the ball moving forward when it reaches the bottom of the incline
A rock is shot vertically upward from the edge of the top of a tall building. with what upward velocity is the rock shot
In a heart pacemaker, a pulse is delivered to the heart 78 times per minute. What is the capacitance of the capacitor
A college professor can see objects clearly only if they are between 70 and 510 cm from her eyes. What is the power of the bottom lens
A bullet with a mass of 4.0 g and a speed of 650 m/s is fired at a block of wood with a mass of 0.095 kg. What is the speed of the bullet when it exits the block
You throw a 21.6 N rock vertically into the air from ground level. You observe that when it is a height 14.4m above the ground, What is its speed just as it left the ground
Jack and Jill exercise in a 25.0-m-long swimming pool. Find the average velocity and average speed of each swimmer
What is the percent change in momentum of a proton that accelerates from 0.49c to 0.90c? What is the percent change in momentum of a proton that accelerates from 0.90c to 0.98c?
In getting ready to slam-dunk the ball, a basketball player starts from rest and sprints to a speed of 6.94 m/s in 1.48 s. determine the distance he runs
What is the height of the power line and the initial speed of the ball?
Explain how a submarine is caused to submerge and surface without the use of its propulsion propeller and fins
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