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3 years ago

Giving brainliest if you answer

Physics

1 answer:

Gekata [30.6K]3 years ago

3 0

Your answer is B because,

The amount of sun a region receives depends on the tilt of the earth's axis and not its distance from the sun. The northern hemisphere experiences summer during the months of June, July, and August because it is tilted toward the sun and receives the most direct sunlight-<em>nationalgoe</em>.

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When a particular hanging mass is suspended from the string, a standing wave with two segments is formed. When the weight is red

ahrayia [7]

Solution :

Mass is varied keeping frequency constant.

Wavelength, λ $=\frac{2l}{n}$

where length of spring = l

number of segments = n

Velocity, v = λ x f

= $\sqrt{\frac{T}{\mu}}$

$\mu$ = mass density, T = tension in string

$T=\frac{4 \mu l^2f^2}{n^2}$

$T=mg = \frac{4 \mu l^2f^2}{n^2}$ , n = 2

$T = (m-2.2)g = \frac{4 \mu l^2f^2}{n^2}, n = 5$

$\Rightarrow \frac{m}{m-2.2}=\frac{25}{4}$

$\Rightarrow m = 2.619\ kg$

Therefore, μ = 0.002785 kg/ m

Frequency is varied keeping T constant

$T=\frac{4 \mu l^2f^2}{n^2}, f=60 , \ \ n = 2$

$T=\frac{4 \mu l^2f^2}{n^2}, f=? , \ \ n = 7$

$\Rightarrow \frac{60^2}{4}=\frac{f^2}{49}$

f = 210 Hz

8 0

3 years ago

PART ONE

Arte-miy333 [17]

Explanation:

Pressure = force / area

P = (68 kg × 9.8 m/s²) / (2 × (0.04 m)²)

P = 208,250 Pa

Converting to psi:

P = 208,250 N/m² × (0.225 lbf/N) × (0.0254 m/in)²

P = 30.2 psi

4 0

4 years ago

while you are waiting to begin a foot race , you can feel your heart rate go up . This is the _ at work.

Ymorist [56]

Answer:

Sympathetic nervous system.

Explanation:

The sympathetic nervous system prepares the body for the “fight or flight” response during any potential danger. The sympathetic nervous system (SNS) increases heart rate. A faster heart rate (usually) pumps more oxygen-rich blood to the brain and lungs. This can give you the energy to run.

While you are waiting to begin a foot race, you can feel your heart race go up. This is the sympathetic nervous system at work.

7 0

3 years ago

A spherical wave with a wavelength of 2.0 mm is emitted from the origin. At one instant of time, the phase at rrr = 4.0 mm is πr

max2010maxim [7]

Complete Question

A spherical wave with a wavelength of 2.0 mm is emitted from the origin. At one instant of time, the phase at r_1 = 4.0 mm is π rad. At that instant, what is the phase at r_2 = 3.5 mm ? Express your answer to two significant figures and include the appropriate units.

Answer:

The phase at the second point is $\phi _2 = 1.57 \ rad$