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KengaRu [80]
4 years ago
6

Why do athletes stretch before the game??? and hii pls help​

Physics
2 answers:
shutvik [7]4 years ago
5 0

Answer:

to stretch their muscles so they don't strain or hurt themselves

Explanation:

hi!

fgiga [73]4 years ago
5 0

Answer:

it's kinda like a warm up. they're getting their body ready for extreme physical activity.

Explanation:

hope it helps, and hi

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A ball is kicked horizontally, at 16.8 m/s, from the edge of a bridge over a smooth flowing river. It lands on the water at a di
Ray Of Light [21]
<h2>Answer:</h2>

<u>The height of bridge is 14.4 m</u>


<h2>Explanation:</h2>

According to third equation of motion

2aS = Vf² - Vi²

Here a = g = 9.8 m.s²

Vf = 0

Vi = 16.8 m/s

So putting the values

2aS = Vf² - Vi²

2 (9.8) (S) = 0 - (16.8)²

19.6 S = 282.24

S = 282.24 / 19.6

S = 14.4 m


5 0
4 years ago
A simple generator has a square armature 6.0 cm on a side. The armature has 85 turns of 0.59-mm-diameter copper wire and rotates
FrozenT [24]

Answer:

f=15.5 Hz

Explanation:

Let's determine the internal resistance:

R=\frac{(p*L)}{A}

ρ = 1.68*10^-8 Ω m

L=0.060m*4*60 = 14.4m

A=\pi*r^2\\A= \pi*(5.9x10^-4m/2)^2=2.734*10^-7m^2

R=(1.68*10^-8)*(14.4m)/(2.734*10^-7m^2)= 0.884Ω

Since the bulb is rated at 12.0 V and 25.0 W,

Current

I=\frac{25W}{12.0v}=2.08 A

Therefore, voltage drop inside generator =

V=(2.08 A)*(0.88)=2.35v

Actual EMF required is

E_{mf}=12.0v+2.35v=14.35v

Note that this is an RMS value.  

The peak voltage is

v_{peak}=14.15v*\sqrt{2} =20.29v

For a generator, by Faraday's Law,

E_{(max)}=N*B*A*w

20.29v=(60)*(0.650T)*(0.06m)^2*ω

ω=144.5\frac{rad}{s}

f=ω/(2π)=

f=144.5 rad/s/(2π)

f=23.001 Hz

6 0
3 years ago
Which of these models of the solar system first proved that the sun is at one of the foci of Earth's elliptical orbit?
Ivenika [448]
Heliocentric model is the name of the model that shows that earth orbits the sun

5 0
4 years ago
Read 2 more answers
An object is moving with constant non-zero velocity on the +x axis. The position versus time graph of this object is
Anna11 [10]

Answer:

C

Explanation:

The Position Versus Time Graph Of This Object Is A Parabolic Curve.

6 0
3 years ago
How to calculate density
Marizza181 [45]

Answer:

The formula for density is d = M/V, where d is density, M is mass, and V is volume. Density is commonly expressed in units of grams per cubic centimetre.

Explanation:

have a beautiful day ahead

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3 years ago
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