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3 years ago

What device creates a magnetic field from an electric current ?

Physics

1 answer:

galben [10]3 years ago

7 0

Answer:

An electromagnet is the device through which runs current and it creates a magnetic field.

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if a 5-kg bowling ball is projected upward witha velocity of 2.0 m/s, then what is the recoil velocity of the Earth(mass=6.0×10^

vitfil [10]

by the concept of momentum conservation we can say

if net force on a system of mass is ZERO then its momentum will remain conserved

Here a ball is projected upwards so if we take Ball + Earth as a system then total momentum of the system will remain conserved

Initially when ball is on the surface of earth the system has zero momentum and hence we can say after throwing the ball momentum of earth + ball must be zero

now using same equation we can say

$P_{ball} + P_{earth} = 0$

$m_1v_1 + m_2v_2= 0$

given that

$m_1 = 5 kg$

$v_1 = 2 m/s$

$m_2 = 6 * 10^{24} kg$

from above equation velocity of earth will be

$v_2 = \frac{m_1 v_1}{m_2}$

$v_2 = \frac{5*2}{6 * 10^{24}}$

$v_2 = 1.67 * 10^{-24} m/s$

so above will be the recoil speed of earth

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3 years ago

_______ are considered to be fluids.

skad [1K]

Answer:

liquids and gases

Explanation:

Liquids and gases are considered to be fluids because they yield to shearing forces, whereas solids resist them.

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3 years ago

Seagrasses are flowering plants. Forty-nine species in 12 genera are known. The flowers are simple and open underwater; pollen i

Harrizon [31]

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4 years ago

Read 2 more answers

A 0.954-kg toy car is powered by three D cells (4.50 V total) connected directly to a small DC motor. The car has an effective e

Natasha2012 [34]

Answer:

0.06 A

Explanation:

We have given mass =0.954 kg

velocity =1.27 m/sec

efficiency =0.361 the output kinetic energy of the motor $KE=\frac{1}{2}mv^2=\frac{1}{2}\times 0.954\times 1.27^2=0.769\ J$

Efficiency =0.361

so input to the motor = output/efficiency

so input to the motor = $\frac{0.769}{0.361}=2.1301$

we know that $P=\frac{E}{T}$ where E is energy and T is time so $P=\frac{2.1301}{7.88}=0.2703W$

We know that power P=VI we have given V=4.5 VOLT

So current $I=\frac{P}{V}=\frac{0.2703}{4.5}=0.06 A$

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3 years ago

Read 2 more answers

Two identical heavy balls are dropped from the top of the Leaning Tower of Pisa. The second ball is dropped 1 s after the first

Pepsi [2]

As the balls continue to accelerate to the ground, the distance between them before the first ball hits the ground will increase.

<h3>What is acceleration?</h3>

Acceleration is defined as the rate change of velocity with time.

acceleration a = (Δv) / (Δt)

Two identical heavy balls are dropped from the top of the Leaning Tower of Pisa. The second ball is dropped 1 s after the first ball. The first ball start falling 1s earlier than the second ball. Thus, the acceleration for first ball will be greater than the second ball.

Thus, the distance between them before the first ball hits the ground will increase.

Learn more about acceleration.

brainly.com/question/12550364

#SPJ1

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2 years ago

What device creates a magnetic field from an electric current ?​

What device creates a magnetic field from an electric current ?