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4 years ago

9

Recreational time can come before our after school

2 answers:

Dafna11 [192]4 years ago

8 0

Answer:

TRUE

Explanation:

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Studentka2010 [4]4 years ago

6 0

After school recreational time always come

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A 100-turn coil with an average radius of 0.04 m is placed in a uniform magnetic field so that ϕ = 60°. The strength of the fiel

gogolik [260]

<em><u>Five</u></em>

This is exactly like your question 2. You need only substitute the given numbers here.

Givens

N = 100 turns
delta B = 0.25
r = 0.04
Area = pi * r^2 = 3.14 * 0.04^2 = 5.02 * 10^-3
Cos 60 = 1/2 = 0.5

Formula

e = N * delta B * Area * cos phi

Solution

e = - 100 * 0.25 * 5.02 * 10^-3 * 0.5

e = 0.0628 = 0.063

Answer

A

<em><u>Six</u></em>

This is a notes question. The result is a sine curve. I don't know how they are counting the change in direction. Is a rising curve different from a falling curve? For sure going from plus to minus is a change in direction, but I still don't know how to count it. It will depend on what you have been told.

I would answer 4 but this is by no means certain. The only other possible answer is 2

4 0

4 years ago

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When is the kinetic energy of the ball being transformed into gravitational potential energy?

Trava [24]

Answer:

The second option

Explanation:

I am not sure sry

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4 years ago

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How does energy keep the world going? How is energy conserved?

MrRissso [65]

Answer:

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3 years ago

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The oscilloscope is set to measure 2 volts per division on the vertical scale. The oscilloscope display a sinusoidal voltage tha

andrew-mc [135]

Answer: 7.2V

Explanation:

Peak values or peak to peak voltage are calculated from RMS values, which implies VP = VRMS × √2, (assuming the source is a pure sine wave).

Since it's a sinusoidal voltage and measuring from an oscilloscope, the peak to peak voltage is gotten thus:

No of division X Volts/divisions

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3 0

4 years ago

A 50-gram ball is released from rest 80 m above the surface of the Earth. During the fall to the Earth, the total thermal energy

Nady [450]

Answer:

Speed of ball just before it hit the surface is 31.62 m/s .

Explanation:

Given :

Mass of ball , m = 50 g = 0.05 kg .

Height from which it falls , h = 80 m .

Thermal energy , E = 15 J .

Now , Initial energy of the system is :

$E_i=\dfrac{mv^2}{2}+mgh$

Here , initial velocity is zero .

Therefore , $E_i=mgh=40\ J$

Now , final energy of the system :

$E_f=\dfrac{mv^2}{2}+mg(0)+15\\\\E_f=\dfrac{0.05\times v^2}{2}+15$

Since , no external force is applied .

Therefore , total energy of the system will be constant .

By conservation of energy :

$E_i=E_f\\40=\dfrac{0.05v^2}{2}+15\\\\25=\dfrac{0.05v^2}{2}\\\\v=31.62\ m/s$

Therefore , speed of ball just before it hit the surface is 31.62 m/s .

3 0

3 years ago