Which is a way that biotechnology has not helped society

nika2105 [10]

Answer:

Explanation:

<h2>Mark me me brainliest plz i really need it （⌒▽⌒）</h2>

6 0

2 years ago

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Time running out plzz hurry!!!!!!

Vesnalui [34]

I think you would hear a lower pitch

3 0

3 years ago

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A student has a weight of 655 N. While riding a roller coaster they seem to weigh 1.96x 103 N at the bottom of a dip that has a

Nadya [2.5K]

Answer:

The speed of the roller coaster at this point is 18.74 m/s.

Explanation:

Given that,

Weight of the student, W = 655 kg

Weight of the roller coaster, $F=1.96\times 10^3\ N$

Radius of the roller coaster, r = 18 m

At the bottom of the loop, the weight of the roller coaster us given by :

$F=W+\dfrac{mv^2}{r}$

If m is the mass of the roller coaster,

$W=mg$

$m=\dfrac{W}{g}$

$m=\dfrac{655}{9.8}$

m = 66.83 kg

So,

$F=W+\dfrac{mv^2}{r}$

$v=\sqrt{\dfrac{(F-W)r}{m}}$

$v=\sqrt{\dfrac{(1.96\times 10^3-655)\times 18}{66.83}}$

v = 18.74 m/s

So, the speed of the roller coaster at this point is 18.74 m/s. Hence, this is the required solution.

4 0

3 years ago

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If the index of refraction for a certain glass is 1.5, and the angle of refraction is 15 degrees for a ray of light

LiRa [457]

Answer:

$\theta_i = 23^o$

Explanation:

The refractive index of a medium is given by the following formula:

$\eta = \frac{Sin\theta_i}{Sin\theta_r}$

where,

η = refractive index = 1.5

$\theta_i$ = angle of incidence = ?

$\theta_r$ = angle of refraction = 15°

Therefore,

$1.5 = \frac{Sin\theta_i}{Sin15^o}\\\\Sin\theta_i=(1.5)Sin15^o\\\\\theta_i = Sin^{-1}(0.388)\\\\$

$\theta_i = 23^o$

4 0

3 years ago

In which situations is gravitational potential energy present?

Assoli18 [71]

Gravitational potential energy is associated with the shape or position of an object.
1.)When an object is placed at height h above ground, gravitational potential energy associated with it is given by,
P.E = mgh
2.)In projectile motion during upward motion, kinetic energy of object is converted into potential energy.

6 0

3 years ago