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3 years ago

What is the force that can cause two pieces of iron to attract each other?

2 answers:

8 0

Is it A ? Yes ! Two pieces of iron DO always attract each other with equal and opposite gravitational forces, although the forces are so small that we never notice them.

Is it B ? Yes, it could be. If at least one of the pieces of iron is magnetized, then they can attract each other with equal and opposite magnetic forces.

Is it C ? Yes, it could be. But the pieces of iron would have to be joined by a stretched rubber band. Then they would attract each other with equal and opposite elastic forces.

Is it D ? Yes, it could be. If one of the pieces of iron carries a net electric charge, then they attract each other with equal and opposite electrostatic forces.

Rudiy273 years ago

6 0

Answer:

B. Magnetic Force

Explanation:

two pieces of irons cannot attract each other unless at least one of them is magnetize. That force is called magnetism.

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In this problem, you will apply kinematic equations to a jumping flea. Take the magnitude of free-fall acceleration to be 9.80 m

leonid [27]

The initial velocity used by the flea to jump straight upward is 3.1 m/s

<h3>Data obtained from the question</h3>

The following data were obtained from the question:

Acceleration due to gravity (g) = 9.8 m/s²
Maximum height (h) = 0.49 m
Final velocity (v) = 0 m/s (at maximum height)
Initial velocity (u) =?

<h3>How to determine the initial velocity</h3>

The initial velocity used by the flea to jump upward can be obtained as follow:

v² = u² – 2gh (since the ball is going against gravity)

0² = u² – (2 × 9.8 × 0.49)

0 = u² – 9.604

Collect like terms

u² = 0 + 9.604

u² = 9.604

Take the square root of both sides

u = √9.604

u = 3.1 m/s

Thus, the initial velocity is 3.1 m/s

Learn more about motion under gravity:

brainly.com/question/22719691

#SPJ1

4 0

2 years ago

A source charge generates an electric field of 1236 N/C at a distance of 4 m. What is the magnitude of the source charge?

guajiro [1.7K]

The correct answer to the question is- $2.2\ \mu C$

CALCULATION:

As per the question, the electric field generated by the source charge is 1236 N/C at a distance of 4 m.

Hence , electric field E = 1236 N/C.

The distance of the point R = 4m

We are asked to calculate the charge possessed by the source.

The electric field produced by a source charge of Q at a distance R is calculated as -

Electric field E = $\frac{1}{4\pi \epsilon_{0}}\frac{Q}{R^2}$

Here, $\epsilon_{0}$ is called the absolute permittivity of the free space.

Hence, the charge of source is calculated as -

Q = $E\times 4\pi \epsilon_{0}\times R^2$

= $1236\times \frac{1}{9\times 10^9}\times (4)^2\ Coulomb$

= $2197.33\times 10^{-9}\ C$

= $2.19733\times 10^{-6}\ C$

= $2.2\ \mu C$

Hence, the charge of source is $2.2\ \mu C$

3 0

3 years ago

Read 2 more answers

An astronaut has left the International Space Station to test a new space scooter. Her partner measures the following velocity c

stiv31 [10]

Answer

given,

time interval = 11.3 s

a) initial velocity, vi = 15 m/s

final velocity, v_f = -5.30 m/s

$a = \dfrac{v_f-v_i}{t}$

$a = \dfrac{-5.30 -15}{11.3}$

a = -1.79 m/s²

the direction is along left side

b) initial velocity, vi = -5.30 m/s

final velocity, v_f = -15 m/s

$a = \dfrac{v_f-v_i}{t}$

$a = \dfrac{-15-(-5.30)}{11.3}$

a = -0.858 m/s²

the direction is along left side

c) initial velocity, vi = 15 m/s

final velocity, v_f = -15 m/s

$a = \dfrac{v_f-v_i}{t}$

$a = \dfrac{-15-(15)}{11.3}$

a = -2.65 m/s²

the direction is along left side

5 0

3 years ago

According to the solar nebular theory, a supernova triggered the collapse of a nebula, which began the formation of clumps of ga

tekilochka [14]

The answer would be sun and planets. The reason is because when there was pressure in the nebula collapse it became hotter and created a star also know as the sun which also created planets with it.

6 0

4 years ago

A pendulum is observed to complete 23 full cycles in 58 seconds. Use the definition of frequency to find the frequency.

Alex17521 [72]

Answer: f = 0.397 Hz

Explanation:

f = cycles per second

f = 23 / 58 = 0.39655...

4 0

3 years ago