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1 year ago

An alternating current of 60hz changes direction 100 times per second.

Physics

1 answer:

Dvinal [7]1 year ago

7 0

Answer:

False

Explanation:

Because it is 60 hz

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How was Uranus different from most other planets

Juli2301 [7.4K]

Its axis is tilted on the side.

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3 years ago

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How long does it take an airplane to fly 5000m if it maintains a speed of 240 meters per second

Rudiy27

Answer:

20.83

Explanation:

5000/240

7 0

3 years ago

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If a second resistor with R2 = 19.0 Ω is connected in series with R1, what is the total rate at which electrical energy is dissi

luda_lava [24]

Total rate at which electrical energy is dissipated by the two resistors are V²/R or I²R.

<u>Explanation:</u>

When the two resistors are combined in series then the total resistance gets added.

If $R_{1}$ and $R_{2}$ are in series then total resistance, R =

Total resistance becomes $R_{1}$ + 19 Ω

The total electrical power dissipated is equivalent to the power dissipated.

We know,

Power = V²/R or

Power = I²R

where, V is the potential difference between the ends

I is the current supplied.

Therefore, total speed at which electrical power is consumed by the two resistors are V²/R or I²R.

7 0

3 years ago

If the action force is the boy pushing the box, what is the reaction force?

MrRissso [65]

Answer:

B - the box pushing against the boy

Explanation:

Newton's third law of motion also known as the law of action and reaction states that for every action there is equal and opposite reaction.

The action force is the force acting in one direction while the reaction force is the force acting in the opposite direction. for example, when a person wants to jump, the person exerts a downward force on the ground known as action force and also, the ground exerts upward force on the person known as reaction force.

If the action force is the boy pushing the box, what is the reaction force is the box pushing against the boy.

4 0

3 years ago

One strategy in a snowball fight is to throw a snowball at a high angle over level ground. While your opponent is watching this

Ne4ueva [31]

Answer:

In order to hit the same point with the second ball, you should throw it at an angle of 18° above the horizontal.

Explanation:

Horizontal reach formula for projectiles tells us

$d=\frac{v_i^2\sin(2\theta)}{g},$

where $v_i$ is the initial velocity and $\theta$ the angle above the horizontal.

Since for both shots the reach must be the same, we have

$\frac{v_i^2\sin(2\theta_1)}{g}=\frac{v_i^2\sin(2\theta_2)}{g}\\\sin(2\theta_1)=\sin(2\theta_2)\\\theta_2=\frac{1}{2}\arcsin(\sin(2\theta_1))=\frac{1}{2}\arcsin(\sin(2\times 72\deg))=\mathbf{18\deg}$ .

8 0

3 years ago