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4 years ago

Do magnets have to touch each other in order to experience a magnetic force ?

Physics

2 answers:

deff fn [24]4 years ago

6 0

Answer:

No they do not : ) .

Explanation:

magnets have a magnetic field. If a magnetic material is within this field it will be attracted to the magnet.

Serjik [45]4 years ago

5 0

Answer:

Explanation:

You might be interested in

A 2 kg car accelerated from 10 m's to 20 m/s using a force of 3000N. How quickly did it

elena-14-01-66 [18.8K]

Answer:

the car accelerates in

$\frac{1}{150} \: or \: 0.006 \: second$

Explanation:

here's the solution : -

we know,

=》

$force = mass \times acceleration$

=》

$acceleration = \frac{force}{mass}$

=》

$a = \frac{3000}{2}$

=》

$a = 1500$

so, acceleration = 1500 m/s^2

now,

=》

$a = \frac{v - u}{t}$

here, a = acceleration, v = final velocity,

u = initial velocity, t = time taken.

So,

=》

$1500 = \frac{20 - 10}{t}$

=》

$1500 = \frac{10}{t}$

=》

$t = \frac{10}{1500}$

=》

$t = 0.006 \: sec$

7 0

3 years ago

When the gun fires a projectile with a mass of 0.040 kg and a speed of 380 m/s, what is the recoil velocity of the shotgun and a

ryzh [129]

Complete question:

The recoil of a shotgun can be significant. Suppose a 3.6-kg shotgun is held tightly by an arm and shoulder with a combined mass of 15.0 kg. When the gun fires a projectile with a mass of 0.040 kg and a speed of 380 m/s, what is the recoil velocity of the shotgun and arm–shoulder combination?

Answer:

The recoil velocity of the shotgun and arm–shoulder combination is 1.013 m/s

Explanation:

Given;

combined mass of the shotgun and arm–shoulder, m₁ = 15 kg

mass of the projectile, m₂ = 0.04 kg

speed of the projectile, u₂ = 380 m/s

let the recoil velocity of the shotgun and arm–shoulder combination = u₁

Apply the principle of conservation of linear momentum;

m₁u₁ + m₂u₂ = 0

m₁u₁ = - m₂u₂

$u_1 = -\frac{m_2u_2}{m_1} \\\\u_1 = - \frac{0.04\times 380}{15} \\\\u_1 =-1.013 \ m/s\\\\u_1 = 1.013 \ m/s \ \ \ in \ opposite \ direction$

Therefore, the recoil velocity of the shotgun and arm–shoulder combination is 1.013 m/s

3 0

4 years ago

What were the physical activities in your childhood that you still do today? Do you spend more time now in doing these activitie

user100 [1]

I used to play tag or run around a lot and sometimes i do these activities but its a lot less now that i am older

5 0

4 years ago

a. How many excess electrons must be distributed uniformly within the volume of an isolated plastic sphere 25.0 cm in diameter t

Agata [3.3K]

Answer:

Explanation:

The electric field outside the sphere is given as,

E = k Q /r²

here Q = n x 1.6 x 10⁻¹⁹ C

where n is the number of electons

if the dimeter of sphere d= 25 cm= 0.25 m

then the radius r = 0.125 m

we get

n= E r²/ k x 1.6 x 10⁻¹⁹ C

n = 1350N/C x (0.125m)² / (8.99 x 10⁹ N m²/C² x 1.6 x 10⁻¹⁹ C)

n = 14664731646

5 0

3 years ago

Cuanta fuerza se necesita lara evitar que una piedra de 20N caiga?

Bogdan [553]

Answer:

Reaction is 20N.

Explanation:

In general, Newton's third law of motion explains that when a force is applied on an object, a reaction of equal magnitude applies in the reverse direction of the force.

i.e F = -R

This implies that, reaction is a force in the opposite direction to that of the force applied.

Force can also be related to the weight of an object as;

F = W = mg

Thus to prevent the 20N stone from falling, a force of 20N is applied in the opposite direction. So the reaction, R is 20N.

6 0

3 years ago