The magnetic north pole changes location but the geographic north pole does not true or false

Answers

Answer 1

Answer: The North Magnetic Pole is the point on the surface of Earth's Northern Hemisphere at which the planet's magnetic field points vertically downwards (in other words, if a magnetic compass needle is allowed to rotate about a horizontal axis, it will point straight down). There is only one location where this occurs, near (but distinct from) the Geographic North Pole and the Geomagnetic North Pole. So yes true

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What is the density of 244 grams of aluminum that has a volume of 90 ml?

Answers

Answer:

The answer is 2.71 g/mL

Explanation:

The density of a substance can be found by using the formula

$density = (mass)/(volume) \n$

From the question

mass = 244 g

volume = 90 mL

So we have

$density = (244)/(90) = (122)/(45) \n = 2.71111111...$

We have the final answer as

2.71 g/mL

Hope this helps you

The discovery that one current-carrying wire exerts a force on a second current-carrying wire was made by _________.Coulomb
Oersted
Faraday
Ampere

Answers

This discovery was made by Ampere. He further investigated the discovery made by Oersted. Ampere lead to the realization that two parallel wires that carry current exert a force upon each other. He further discovered that when the currents in two wires are in the same direction they are attracted to each other while when the currents are in the opposite directions they are attracted.

If you want to decrease the current created by a generator what can you do?

Answers

Answer:

To decrease the current;

1) Use fewer loops or number of turns

2) Use a lower speed of rotation of the coil in the magnetic field

3) Use a weaker magnetic

Explanation:

According to Faraday's Law of induction, which is the basis of the electromagnetism, electromagnetic induction and therefore the basis of the electric generator, can be written as follows;

$\epsilon = -N \cdot (\Delta \phi)/(\Delta t)$

Where;

ε = The induced voltage

N = The number of turns (loops)

ΔФ = The change in the magnetic flux

Δt = The change in the time (the duration)

Given that voltage is directly related to the current, decreasing the voltage, decreases the current

To decrease the voltage, and therefore, the current we can;

1) Reduce the number of loops in the coil

2) Increase the time change per unit change in flux by slowing down the speed of rotation of the generator

3) Decrease the amount of change in the magnetic field per turn, by using a weaker magnetic

How do you complete this mixed circuit?

Answers

For the resistor closest to the battery, drawn vertical in the diagram, I = 8 A and P = 320 watts.

Also, the battery voltage is 40 V.

There isn't enough information included in the picture to fill in any of the missing items for the other two resistors.

What is the power of 10 when 157,821 is written in scientific notation?

Answers

Answer: The power of 10 in the given value is 5.

Explanation:

Scientific notation is defined as the representation in which a number is expressed in the decimal form. That means always written in the power of 10 form. The decimal place is put after 1 digit.

We are given a numerical value of 157,821

Converting this into scientific notation, we get:

$157,821=1.57821* 10^5$

Hence, the power of 10 in the given numerical value is 5.

1.57821 * 10^5
so answer is 5

A mass that weighs 8 lb stretches a spring 24 in. The system is acted on by an external force of 4 sin 4t lb. If the mass is pulled down 6 in. and then released, determine the position of the mass at any time. Determine the first four times at which the velocity of the mass is zero

Answers

Answer:

$t = (\pi)/(8), (\pi)/(4), (3\pi)/(8), (3 \pi)/(4)$

Explanation:

The equation of force is

F = 4 sin 4 t

Compare with the standard equation

f = A sin wt

where, w is the angular frequency and A is the amplitude.

Now

w = 4 rad/s

Let the time period is T.

the relation for the time period is

$T = (2\pi)/(w)\n\nT = (2 \pi)/(4)\n\nT = (\pi)/(2)$

the time period is defined as the time taken by the body to complete one oscillation.

So, the velocity is zero at the extreme points where the object is at time, T/4 and its odd T/2, 3T/4, 3T/2, etc.

So, the velocity is zero at time

$t = (\pi)/(8), (\pi)/(4), (3\pi)/(8), (3 \pi)/(4)$

Final answer:

To determine the position of the mass and the times when the velocity is zero in a mass-spring system.

Explanation:

To determine the position of the mass at any time, we need to solve the equation of motion for the mass-spring system. The equation is:

mx'' + kx = Fext

where m is the mass, x is the displacement of the mass from its equilibrium position, k is the spring constant, and Fext is the external force. We can solve this differential equation to find the position of the mass as a function of time.

To determine the first four times at which the velocity of the mass is zero, we need to solve for the velocity of the mass, which is given by:

v = x'

We can find the times at which the velocity is zero by finding the values of t for which x' = 0.

Learn more about Mass-spring system here:

brainly.com/question/30393799

#SPJ12

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