What is the value of the current density

Assignment Help Physics
Reference no: EM13259659

The quantity of charge q (in coulombs) that has passed through a surface of area 1.90 cm2 varies with time according to the equation q = 8t3 + 8t + 6, where t is in seconds.

(a) What is the instantaneous current through the surface at t = 1.05 s?

A

(b) What is the value of the current density?

kA/m2

Reference no: EM13259659

Questions Cloud

How much work must the thrusters do : A 4900 kg lunar lander is in orbit 60 km above the surface of the moon. How much work must the thrusters do
Knowledge of accounting concepts and terminology : Why is a knowledge of accounting concepts and terminology useful to anyone in a business activity? Is there a difference between bookkeeping and accounting? Discuss.
Explain what is the ph of a solution created by mixing : What is the pH of a solution created by mixing 368.0 mL of 0.175 M Hydrochloric Acid, HCl, with 231.0 mL of 0.318 M Sodium Hydroxide, NaOH?
Determine the output of the generator in watts : A small gasoline engine can put out 18,000 N-m/min of mechanical power. The engine is used to drive an electrical generator that is 80 percent efficient. 1 N-m = 2.78 X 10-4 W-h. Find the output of the generator in Watts.
What is the value of the current density : The quantity of charge q (in coulombs) that has passed through a surface of area 1.90 cm2 varies with time according to the equation q = 8t3 + 8t + 6, What is the value of the current density
Compute the ka value for the unknown acid : A solution of 0.0041 M of an unknown acid has a pH of 3.195. Calculate the Ka value for the unknown acid, HA.
Ddesign a program that calculates the total amount : Ddesign a program that calculates the total amount of a meal amount of a meal purchased at a restaurant. The program should ask the user to enter the charge for the food
Which is not the conditions met for revenue : Which of the following is not one of the four conditions that normally must be met for revenue to be recognized according tothe revenue principle for accrual basis accounting?
How much time will torque take to rotate : A torque of 18 N-m is applied to a rotating part. The moment of inertia is 0.078 kg-m2. How much time (in seconds) will it take to rotate the part 180°?

Reviews

Write a Review

Physics Questions & Answers

  Is the motion simple harmonic

The woman then starts walking clockwise around the rim at .75 rad/s. in what direction and with what angular speed does the turntable rotate.

  How a large amount work to eject a positive sodium ion

An oscillator with a mass of 530 g and a period of .80 s has amplitude that decreases by 2 percent during each complete oscillation. At what time will the energy be reduced to 33 percent of its initial value.

  What is the resulting speed of the combined cars

Florence, who weighs 120 lbs, stands on a bathroom scale in an elevator. What would the scale read when the elevator is accelerating downward at 2m/s2.

  Find out the number of moles of gas

Assume the volume of the tank and the temperature of gas remain constant all through this operation.

  Find the refractive power of the contact lenses

A person can't see objects clearly that are closer than 80 cm. What is the refractive power of the contact lenses wouyld you prescribe

  Determine the spring constant in n/m

The mass then travels vertically and it takes 1.10 s for the mass to reach the top of its trajectory. Determine the spring constant, in N/m. (Use g=9.81 m/s2). Assume that the time required for the spring to reach its full extension is negligible.

  Explain the rule of subtracting two vectors

Explain the rule of subtracting two vectors in graphical and component representation, ow the position of an object changes in time in case of linear motion

  What average force does the molecule exert on the wall

The average speed of a nitrogen molecule in air is about 6.70 ? 102 m/s, and its mass is about 4.68 ? 10-26 kg, What average force does the molecule exert on the wall

  Determine the work required to move an electron

In the x-y plane, a point of +2.6 uC is on the x-axis at (-3 cm, 0), and a second point charge of -3.4 uC is also located on the x-axis, Determine the Work required (in keV) to move an electron from Pa to Pb

  How high is the sun above the horizon

You can turn the crank at a maximum rate of 3 turns per second, but hand crank is connected to the coil through a set of gears that makes the coil spin at a rate 6 times larger than the rate at which you turn the crank. What is the maximum emf you ca..

  Ilustrate what is magnitude of torque about his shoulder

Ilustrate what is the magnitude of the torque about his shoulder if he holds his arm in each of the following ways? Straight out to his side, parallel to the floor.

  What must the charge

What must the charge (sign and magnitude) of a 1.49-g particle be for it to remain stationary when placed in a downward-directed electric field of magnitude 660N/C?

Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd