speed on an electron
Two stationary positive point charges, charge 1 of magnitude 3.25nC and charge 2 of magnitude 1.75nC , are separated by a distance of 42.0cm . An electron is released from rest at the point midway between the two charges, and it moves along the line connecting the two charges.
What is the speed vfinal of the electron when it is 10.0cm from charge 1?
Express your answer in meters per second.
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As you ride on a Ferris wheel, your apparent weight is different at the top than at the bottom.
1-Explain this phenomenon.
2-Calculate your apparent weight at the bottom of the Ferris wheel,given that the radius of the wheel is 7.2m, it completes one revolution every 28s, and your mass is 60kg.
3-Suppose the Ferris wheel were rotating just fast enough to make you feel weightless at the top. How many seconds would it take if to complete one revolution? [Assume the radius of the wheel is still 7.2m.]
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A rocket car is constrained to move on an elliptical track (semi major axis p and semi minor axis q). The car is moving at a constant speed mu. Determine the acceleration of the car is meters per second squared. P = 4 km, q = 2km and mu = 360 km/hr.
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Three identical point charges each of charge q are located at the vertices of an equilateral triangle as in the figure shown below. The distance from the center of the triangle to each vertex is a. (a) Show that the electric field at the center of the triangle is zero. (Submit a file with a maximum size of 1 MB.) This answer has not been graded yet. (b) Find a symbolic expression for the electric potential at the center of the triangle. (Use any variable or symbol stated above along with the following as necessary: ke for the Coulomb's constant.) V = (c) Give a physical explanation of the fact that the electric potential is not zero, yet the electric field is zero at the center.
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A uniform disc of charge has a total charge of 7.00x10-12 C and a radius of 10.0 cm.
A) Find the electric field at a point along its axis 20.0 cm from its center. (1.33 N/C away*)
B) Show that the electric field drops as 1/x2 as x approaches ?. Hint: remember that (1+x)n ~ 1+nx if x<<1)
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Two capacitors are connected in series. Let 3.30?F be the capacitance of first capacitor, 5.00?Fthe capacitance of the second capacitor, and Vab = 60.0V the potential difference across the system.
A)Calculate the charge on each capacitor (Q1 AND Q2)
B)Calculate the potential difference across each capacitor.(Q1 AND Q2)
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How much work does the electric field do in moving a proton from a point with a potential of +155V to a point where it is -50V ?
A) Express your answer in joules.
B) Express your answer in electron volts.
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consider a simple situation: a 12.9kg crate slides rightward from rest without friction 3.2m down a ramp inclined 14.6
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(1) In this problem, we will calculate the electric ?eld of a line charge. The line charge is aligned along the x-axis starting at the origin and having a length L. The line has a linear charge density ?. We want to ?nd the electric ?eld at a point P on the x-axis. The point P is located at the point pd,0q where d?L. (a) List all of the given parameters. (b) What is the dimensionality of a line of charge? What is the electric ?eld of a small charge dq which is one dimension less than our line? (c) What is the charge dq in terms of the given parameters? (d) What is the distance between an arbitrary point on our line charge to the point P in terms of given parameters? (e) What is the unit vector
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A solid sphere 10 cm in radius carries a uniform 40-?C charge distribution throughout its volume. It is surrounded by a concentric shell 20 cm in radius, also uniformly charged with 40 ?C.
a)Find the electric field 5.0 cm from the center.
b)Find the electric field 15 cm from the center.
c)Find the electric field 30 cm from the center.
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In one type of computer keyboard, each key holds a small metal plate that serves as one plate of a parallel-plate, air-filled capacitor. When the key is depressed, the plate separation decreases and the capacitance increases. Electronic circuitry detects the change in capacitance and thus detects that the key has been pressed. In one particular keyboard, the area of each metal plate is 47.0mm2 , and the separation between the plates is 0.670mm before the key is depressed.
Calculate the capacitance before the key is depressed.
If the circuitry can detect a change in capacitance of 0.230pF , how far must the key be depressed before the circuitry detects its depression?
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A certain 8lb hunting rifle fires a 180 grain bullet at a target 1000yds away. The bullet experiences an acceleration of ?2.7 m s 2 (opposite direction of velocity) due to air resistance. When the bullet hits the target, its velocity is measured to be 820 m s . Express all answers in SI units. Helpful conversions:
1 grain = 6.48
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You are working for a shipping company. Your job is to stand at the bottom of a 7.1m -long ramp that is inclined at 39? above the horizontal. You grab packages off a conveyor belt and propel them up the ramp. The coefficient of kinetic friction between the packages and the ramp is ?k=0.30.
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2 A car with inertia 1200kg is driving through a parking lot. A wheeled platform of inertia 1800kg has just been unloaded from a flatbed truck. It gets away from them and is moving toward the car at a velocity of +2.5 m/s . The car cannot avoid it, and the two
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