Determine the MA based on the diagram below.

9. When considering a magnet's force of attraction over a known distance, you would expect the strength of attraction 4 inches a

slavikrds [6]

Answer: B. 16 times

Explanation:

The mathematic expression for a magnetic force $F_{M}$ between two magnets is:

$F_{M}=K_{M}\frac{m_{1}m_{2}}{r^{2}}$ (1)

Where:

$K_{M}$ is a constant

${m_{1}$ and ${m_{2}$ are the magnetic charges, which depends on the size of each magnet

$r$ is the distance beteween both magnets

As we can see, this force in inversely proportional to the square of the distance. This means that if we increase the distance, the magnetic force will decrease.

Now, if we increase this value by 4 inches from 1 inch:

$F_{M}=K_{M}\frac{m_{1}m_{2}}{{(4)}^{2}}$ (2)

$F_{M}=K_{M}\frac{m_{1}m_{2}}{16}$ (3)

This means the strength of attraction will be 16 times weaker.

3 0

4 years ago

If an object has a mass of 20 kg, what is the force of gravity acting on it on earth?

stealth61 [152]

That force is what most people would call the object's "weight".

Wherever the object is, its weight is

(mass) x (acceleration due to local gravity) .

On Earth, the acceleration due to gravity is 9.8 m/s² . (rounded)

The object's weight is (20 kg) x (9.8 m/s²) = 196 newtons .

(about 44.1 pounds)

7 0

3 years ago

Read 2 more answers

A ball of mass 0.165 kg is dropped from rest from a height of 1.25 m. It rebounds from the floor to reach a height of 0.940 m. W

Dmitriy789 [7]

Answer:

I = 1.525 kg.m/s

Explanation:

given,

mass of the ball = 0.165 Kg

height of drop, h = 1.25 m

ball rebound and reach to height, h' = 0.940 m

impulse = ?

using conservation of energy

Potential energy is converted into kinetic energy

$mgh = \dfrac{1}{2}mv^2$

$v=\sqrt{2gh}$

$v=\sqrt{2\times 9.8 \times 1.25}$

v = 4.95 m/s

velocity of the ball after rebound

again using conservation of energy

$mgh = \dfrac{1}{2}mv'^2$

$v'=\sqrt{2gh}$

$v'=\sqrt{2\times 9.8 \times 0.94}$

v' = 4.29 m/s

impulse is equal to change in momentum

I = m ( v' - v )

I = 0.165 x ( 4.29 - (-4.95))

I = 1.525 kg.m/s

6 0

3 years ago

Caves are a type of island ecosystem according to the theory of island biogeography. Please select the best answer from the choi

tatuchka [14]

Answer:

True

Explanation:

A different type of habitat exists in the caves. There exist no green plants/producers but still various life forms evolve with in the caves. The major source of nutrients with in the caves is water and intrusion of other organism that led to deposition of food in the form of debris/guano etc. These food deposits are intake by the organisms living in caves leading to start of food cycle. This is very much similar to any other food cycle

3 0

4 years ago

What does a step-up transformer do?

Alla [95]

Answer:

C. It steps up the voltage.

Explanation:

4 0

3 years ago

Read 2 more answers