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4 years ago

12

Who was the first man to go into the orbit?

1 answer:

kkurt [141]4 years ago

4 0

D. Yuri Gagarin

(Typing this to circumnavigate the 20 character minimum requirement)

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What is the main function of the excretory system?

tiny-mole [99]

Answer: To collect and remove wastes from the body.

Explanation:

The excretory system helps to collect and remove wastes from the body in the form of urine.

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4 years ago

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Which type of electromagnetic waves have longer wavelengths that the waves that make up visible light.

Inessa [10]

Answer:

radiation

Explanation:

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4 years ago

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A ray of light traveling in air strikes the surface of a liquid. if the angle of incidence is 31.7◦ and the angle of refraction

Andrei [34K]

Media 1 and 2 are air and liquid. By Snell's law;
n1/n2 = Sin ∅2/Sin ∅1

Then,
n2 = (n1* Sin Ф1)/Sin ∅2 = (1*Sin 31.7)/Sin 21.3 = 1.4466.

When the light travels in the opposite direction and at critical angle, media 1 and 2 are liquid and air respectively while ∅2 = 90°

Therefore,
n1/n2 = Sin 90 / Sin ∅c => ∅c = Sin ^-1[n2*Sin 90]/n1 = Sin ^-1[1*Sin 90]/1.4466 = 43.73°

The critical angle (∅c) is 43.73°.

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3 years ago

Explain why a valve would last longer in the pulmonary position than in the aortic position

Novosadov [1.4K]

Answer:The pulmonary valve is usually under less stress because the right pumping chamber does not need to generate as much force to push blood to the lungs. Therefore, a replacement valve can be more likely to succeed in the pulmonary position because demand on this valve is less.

Explanation:

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3 years ago

The man is walking with speed v1 = 1.35 m/s to the right when he trips over a small floor discontinuity. Estimate his angular ve

soldier1979 [14.2K]

Answer:

The angular velocity, $\omega = 1.05 rad/s$ clockwise

Explanation:

The mass of the man, m = 72 kg

The center of mass of the man will be at the middle of his body, particularly around his abdomen.

Height of the center of mass, h = 0.71 m

The speed of the man, v₁ = 1.35 m/s

Moment of inertia about the ankle joint, I = 66 kg/m²

Based on the principle of conservation of angular momentum (about the ankle joint):

Angular momentum before impact = Angular momentum after impact

Angular momentum before impact = -mv₁h

Angular momentum before impact = -(72 * 1.35 * 0.71)

Angular momentum before impact = -69.012 kg m²/s...............(1)

Angular momentum after impact = $I \omega$

Angular momentum after impact = $66 * \omega$ .................(2)

$66 \omega = -69.012\\\omega = -69.012/66\\\omega = -1.05 rad/s$

The angular velocity, $\omega = 1.05 rad/s$ clockwise

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3 years ago