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4 years ago

1. What happens when like magnetic poles are brought close together?

Physics

2 answers:

VashaNatasha [74]4 years ago

8 0

Answer:

They repel from each other

Explanation:

nata0808 [166]4 years ago

8 0

Answer:

It is also observed that, magnets attract as well as repel. We can explain this dual nature of magnetic force by proposing that each magnet has two poles, north pole (N) and south pole (S). You will observe two things during the activities:

1) When two magnets are brought near each other, like poles repel; opposite poles attract.

2) When a magnet is brought near a piece of iron, the iron also gets attracted to the magnet, and it acquires the same ability to attract other pieces of iron.

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An arrow is shot at a target 20 m away. The arrow is shot with a horizontal velocity of 80 m/s.

Verdich [7]

(1) The time of motion of the arrow is 0.25 s.

(2) The vertical height dropped by the arrow as it approaches the target is 0.31 m.

The given parameters:

Horizontal distance of the arrow, X = 20 m
Horizontal speed of the arrow, v = 80 m/s

The time of motion of the arrow is calculated as follows;

$t = \frac{X}{v} \\\\t = \frac{20 }{80} \\\\t = 0.25 \ s$

The vertical height dropped by the arrow as it approaches the target is calculated as follows;

$h = v_0_y t + \frac{1}{2} gt^2\\\\h = 0 \ + \ \frac{1}{2} \times 9.8 \times 0.25^2\\\\h =0.31 \ m$

Learn more about time of motion of projectile here: brainly.com/question/1912408

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2 years ago

A washing machine heats 10kg of water in each wash cycle. How much energy is saved by washing at 30'c instead of 50'c if the sta

Volgvan

The equation for this is very simple you add then you subtract then you get the answer then you divide then it all works out for you

6 0

4 years ago

A ball with a mass of 3kg is dropped from the top of a building this is 20m high. what is the velocity of the ball when it is 10

anzhelika [568]

Answer:

Velocity=14[m/s]

Explanation:

We can solve this problem by using the principle of energy conservation, where potential energy becomes kinetic energy.

In the attached image we can see the illustration of the ball falling from the height of 20 meters, at this time the potential energy will have the following value.

$Ep=m*g*h\\where:\\m=3[kg]\\h=20[m]\\$

$Ep=3*9.81*20\\Ep=588.6[J]$

When the ball passes through half of the distance (10m) its potential energy will have decreased by half as shown below.

$Ep=3*9.81*10\\Ep=294.3[m]$

If we know that potential energy is transformed into kinetic energy, we can find the value of speed.

$Ek=\frac{1}{2} *m*v^{2} \\therefore\\v=\sqrt{\frac{Ek*2}{m} } \\v=\sqrt{\frac{294.3*2}{3} } \\\\v=14[m/s]$

7 0

4 years ago

Block 1, of mass m1 = 1.30 kg , moves along a frictionless air track with speed v1 = 27.0 m/s . It collides with block 2, of mas

Dennis_Churaev [7]

(A) The total initial momentum of the system is

(1.30 kg) (27.0 m/s) + (23.0 kg) (0 m/s) = 35.1 kg•m/s

(B) Momentum is conserved, so that the total momentum of the system after the collision is

35.1 kg•m/s = (1.30 kg + 23.0 kg) v

where v is the speed of the combined blocks. Solving for v gives

v = (35.1 kg•m/s) / (24.3 kg) ≈ 1.44 m/s

1/2 (1.30 kg + 23.0 kg) (1.44 m/s)² ≈ 25.4 J

and before the collision, it is

1/2 (1.30 kg) (27.0 m/s)² ≈ 474 J

so that the change in kinetic energy is

∆K = 25.4 J - 474 J ≈ -449 J

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3 years ago

What is electron affinity?

Andrews [41]

Answer:

The electron affinity of an atom or molecule is defined as the amount of energy released when an electron is attached to a neutral atom or molecule in the gaseous state to form a negative ion.

4 0

3 years ago

1. What happens when like magnetic poles are brought close together?​

1. What happens when like magnetic poles are brought close together?