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3 years ago

State thethe properties of magnets.

Physics

1 answer:

Zigmanuir [339]3 years ago

4 0

Answer:

All magnets have two poles: the North Pole and the South Pole.

Magnets attract ferromagnetic materials such as iron, nickel, and cobalt.

The magnetic force of a magnet is stronger at its poles than in the middle.

A freely suspended magnet always points in North-South direction.

Hope this helps

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A ductile metal wire has resistance R. Then the wire is stretched to three times its original length. The stretching shrinks the

Ivenika [448]

Explanation:

Let us assume that the final resistance after stretching is $R_{f}$ . Since, the volume of rod does not change and the initial and final volume will be the same as follows.

V = $V_{f}$

$LA = L_{f}A_{f}$

It is given that, $L_{f} = 3L$ .

Therefore, $LA = L_{f}A_{f}$

$LA = 3LA_{f}$

$A_{f} = \frac{A}{3}$

We know that relation between resistance and area is as follows.

R = $\frac{\rho L}{A}$

$R_{f} = \frac{\rho L_{f}}{A_{f}}$

= $\frac{\rho (3L)}{\frac{A}{3}}$

= 9 $(\frac{\rho L}{A})$

= 9R

Thus, we can conclude that the resistance of the stretched wire is 9R.

8 0

3 years ago

Read 2 more answers

A crane carries a 1600 kg car at 1.5 m/s^2 with a chain that has a negligible mass. If the coefficient of kinetic friction betwe

padilas [110]

Answer:

option (d) 7.1 kN

Explanation:

Given:

Mass of the car, m = 1600 kg

Acceleration of the car, a = 1.5 m/s²

Coefficient of kinetic friction = 0.3

let the tension be 'T'

Now,

ma = T - f .................(1)

where f is the frictional force

also,

f = 0.3 × mg

where g is the acceleration due to the gravity

thus,

f = 0.3 × 1600 × 9.81 =

therefore,

equation 1 becomes

1600 × 1.5 = T - 4708.8

T = 2400 + 4708.8

T = 7108.8 N

T = 7.108 kN

Hence,

The correct answer is option (d) 7.1 kN

6 0

3 years ago

Help me find the natural logarithum of csch^-1 ((-1)/(2 sqrt(30)))

SVEN [57.7K]

The inverse hyperbolic cosecant of anything is a negative number.

In particular, csch⁻¹ [ (-1)/(2√30) ] = csch⁻¹ (≈ -0.0913) = ≈ -3.089

Whatever it is, negative numbers don't have logarithms.

3 0

4 years ago

A horse trots 17 miles north and then turns and trots 24 miles at an angle of 40° west of north. Find the resultant displacement

DanielleElmas [232]

Answer:

Resultant displacement = 38.58 miles at an angle of 23.57° north of west.

Explanation:

Let north represent positive y direction and east represent positive x direction. Unit vector along x direction is represented by i and vector along unit vector along y direction is represented by j

Initial displacement = 17 miles north = 17 j miles

Final displacement = 24 miles at an angle of 40° west of north = 24 miles at an angle of 130° to positive x -axis

= (24 cos 130 i + 24 sin 130 j )

= (-15.43 i + 18.36 j ) miles

Total displacement = 17 j + (-15.43 i + 18.36 j) = -15.43 i + 35.36 j

Magnitude of displacement $=\sqrt{(-15.43)^2+35.36^2} =38.58 miles$

Angle to positive x -axis = tan⁻¹(35.36/-15.43) = 113.57°

Resultant displacement = 38.58 miles at an angle of 23.57° west of north.

8 0

3 years ago

Where in the solar system (and beyond) have scientists found evidence of organic molecules?

mel-nik [20]

Answer:

Beyond our solar system, organic molecules have been found in giant clouds of dust and gas between stars and in star-forming regions.

In our solar system, besides Earth, organic molecules have been discovered on comets, in meteorites, on Saturn's moon Titan, in the plumes of water expelled from Saturn's moon Enceladus, and on Neptune's moon Triton.

7 0

3 years ago

State thethe properties of magnets.​

State thethe properties of magnets.