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3 years ago

6

A baseball player hits a baseball with a bat. The mass of the ball is 0.05 kilograms. The ball accelerates at 2,000 meters per s

econd squared.
What is the net force, to the nearest newton, that accelerates the ball?

1 answer:

AlexFokin [52]3 years ago

8 0

Answer:

550

Explanation:

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Why does a transformer require AC rather than DC? A. so that the magnetic field can be intensified B. so that the energy will be

Aliun [14]

Answer

Correct Answer is D ( so that there will be a change in the magnetic field required for induction)

Explanation:

Transformer is a device in which electrical energy is transferred between two or more circuits.

Transformer working is based on Faraday’s law of electromagnetic induction. Transformation action in a transformer occur due to mutual induction between two or more winding.

A transformer consists of one or more winding which are coupled magnetically and separated electrically with a magnetic core. A changing or varying current in one coil of the transformer produces a changing magnetic flux due to which an emf (electromotive force ) is induced across the second coil which is wound around the same core.

Therefore a transformer needs an AC due to which a changing magnetic field will be created and due to this changing magnetic field an emf will induced in the second coil.

If DC is used in transformer then magnetic induction will not takes place since DC current will remain constant

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3 years ago

A solenoid 10.0 cm in diameter and 63.3 cm long is made from copper wire of diameter 0.100 cm, with very thin insulation. The wi

aliina [53]

Answer:

19559303watts

Explanation:

The field inside a solenoid is

B =µ0*N*I/h

where N is the number of turns, I the current in each turn, and h the length.

If the wire's diameter is d, then the number of turns is N = h/d so the equation becomes

B = µ0*I/d

I = B*d/µ0

B = 7.8*10^-3 T, d = 0.001 m, µ0 = 4*π*10^-7 H/m

I = 8*10^-3*0.001/(4*π*10^-17))

I = 6.366A

For power

We need to know ρ, the resistivity of the wire. The resistance of the coil R = ρ*L/A where L is the total wire length and A the area.

L = N*π*D, were D = diameter of the solenoid and N the no of turns. As above, N = h/d so L = h*π*D/d. The wire area is π*d²/4 so the resistance is

R = ρ*h*π*D/d*(π*d²/4) = 4*ρ*h*D/d³

The power is I²*R = (B*d/µ0)²*4*ρ*h*D/d³ = (B/µ0)²*4*ρ*h*D/d

For copper ρ = 16.8*10^-9 Ω-m and

D = 0.10 m, h = 0.722 m

P = (6.366 / 4 * π * 10^-7)^2 * 4 * 16.8 * 10 ^-9 * 0.722 * 0.1/0.001

P = 19559303watts

P = 20MW

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4 years ago

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An electric slot car has a coil with 100 turns of wire. These loops have a current of 0.1 A and cover an area of 0.1 cm2. If the

Marrrta [24]

Answer:

The torque will be felt by the coil is zero

Explanation:

The torque is:

$\tau =\mu B=\mu Bsin\theta$

Where

μ is the magnetic moment = N * I * A, where N is the number of turns, I is the current and A is the area

A = 0.1 cm² = 1x10⁻⁵m²

$\mu =100*0.1*1x10^{-5} =1x10^{-4} Am^{2}$

If the angle between the area and the magnetic field is 0 (are in parallel), then:

$\tau =1x10^{-4} *1*sin0=0Nm$

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3 years ago

A trooper is moving due south along the freeway at a speed of 23 m/s. at time t = 0, a red car passes the trooper. the red car m

Deffense [45]

The answer choice is 23

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A plant uses the energy from sunlight to create oxygen and glucose from carbon dioxide and water. Which statement is true about

faltersainse [42]

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❖ The correct answer choice is A. A chemical change has occurred because new compounds have been produced.

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3 years ago

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