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Brut [27]
4 years ago
14

What causes materials to have magnetic fields?

Physics
1 answer:
Natasha_Volkova [10]4 years ago
5 0

Answer:

Magnetism is caused by the motion of electric charges.

You might be interested in
A cork floats on the surface of an incompressible liquid in a container exposed to atmospheric pressure. The container is then s
yaroslaw [1]

Question:

A cork floats on the surface of an incompressible liquid in a container exposed to atmospheric pressure. The container is then sealed and the air above the liquid is evacuated. The cork:

A. sinks slightly  

B. rises slightly  

C. floats at the same height  

D. bobs up and down about its old position

Answer:

The correct answer is C)  floats at the same height  

Explanation:

The liquid is incompressible because its density very high and leaves no room for further compaction whether or not there is atmospheric pressure. So when you put a cork on the liquid, pressure or no pressure, there is no displacement hence it floats on the same height regardless of the absence of air.

Cheers!

6 0
3 years ago
A force of 1.200×103 N pushes a man on a bicycle forward. Air resistance pushes against him with a force of 615 N. If he starts
AleksAgata [21]

Answer:

15.45 m/s

Explanation:

F = 1.2 x 10^3 N, Fk = 615 N, u = 0, s = 25 m

Let the speed after traveling 25 m is v.

mass = F / g = 1200 / 9.8 = 122.45 kg

Net force, Fnet = 1.2 x 1000 - 615 = 1200 - 615 = 585 N

acceleration = Fnet / mass = 585 / 122.45 = 4.78 m/s^2

Use third equation of motion

v^2 = u^2 + 2 a s

v^2 = 0 + 2 x 4.78 x 25 = 238.88

v = 15.45 m/s

4 0
3 years ago
Two football players collide head-on in midair while chasing a pass. The first player has a 101.0 kg mass and an initial velocit
love history [14]

Assuming players stick together immediately after the collision, their speed will be 1.3206 m/sec, and - ve indicates their direction.

<h3>What is the law of conservation of momentum?</h3>

According to the law of conservation of momentum, the momentum of the body before the collision is always equal to the momentum of the body after the collision.

The given data in the problem is;

(m₁) is the mass of 1st player= 101.0 kg

(u₁) is the initial velocity of 1st player (u₁) = 4.10 m/s

(m₂) is the mass of 2nd player = 117 kg

(u₂) is the initial velocity of 2nd player= -6  m/s

(v) is the velocity after collision =.?

According to the law of conservation of momentum;

Momentum before collision =Momentum after collision

m₁u₁+m₂u₂=(m₁+m₂)V

101.0 kg × 4.10 m/sec + 117 kg × (-6 m/sec) = (101.0 kg + 117 kg) × V

V= - 1.3206 m/sec

Hence, the velocity of players just after impact, if they cling together, will be - 1.3206 m/sec, and - ve shows the direction.

To learn more about the law of conservation of momentum refer;

brainly.com/question/1113396

#SPJ1

4 0
2 years ago
Which of the following quantities are unknown? initial separation of the particles final separation of the particles initial spe
tino4ka555 [31]

ALL of the quantities are unknown, because you haven't bothered to tell us anything that's known.

7 0
3 years ago
The electromagnetic waves that have the lowest frequencies are called a. radio waves. c. ultraviolet waves. b. microwaves. d. x-
IgorC [24]

the answer to that would be radio waves which would be answer A

3 0
4 years ago
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