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mojhsa [17]
3 years ago
7

PLZ HELP

Physics
2 answers:
Sati [7]3 years ago
8 0

Answer:

the index of refraction of the second medium is lower

Explanation:

take an exaple of a light ray from air to water that is optically denser the ray is refracted to the normal thus lowering its index of refraction

xeze [42]3 years ago
3 0

This is what I got on my test

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A model airplane is flying horizontally due north at 44 ​mi/hr when it encounters a horizontal crosswind blowing east at 44 ​mi/
Alik [6]

Explanation:

Let i, j and k represents east, north and upward direction respectively.

Velocity due north, v_a=44j\ mi/hr

Velocity of the crosswind, v_w=44i\ mi/hr

Velocity of downdraft, v_d=-22k\ mi/hr (downward direction)

(a) Let v is the position vector that represents the velocity of the plane relative to the ground. It is given by :

v=44i+44j-22k

(b) The speed of the plane relative to the ground can be calculated as :

v=\sqrt{44^2+44^2+22^2}

v = 66 m/s

Hence, this is the required solution.

7 0
3 years ago
Which are methods of reducing exposure to ionizing radiation? Check all that apply
MariettaO [177]
Ionising radiation (ionizing radiation) is radiation that carries enough energy to free electrons from atoms or molecules, thereby ionizing them. Ionizing radiation is made up of energetic subatomic particles, ions or atoms moving at high speeds (usually greater than 1% of the speed of light), and electromagnetic waves on the high-energy end of the electromagnetic spectrum.
6 0
3 years ago
Read 2 more answers
14mm equal to how much cm​
lora16 [44]

Answer:

1.4 cm

Explanation:

7 0
4 years ago
The reason lines on the bottom of a swimming pool can look wavy when seen from above is that​
masha68 [24]

Answer:

it is under water

Explanation:

3 0
3 years ago
A black widow spider hangs motionless from a web that extends vertically from the ceiling above. If the spider has a mass of 1.8
Nezavi [6.7K]

Answer:

<em>The tension in the web is 0.017738 N</em>

Explanation:

<u>Net Force</u>

The net force exerted on an object is the sum of the vectors of each individual force applied to an object.

If the net force equals 0, then the object is at rest or moving at a constant speed.

The spider described in the question is hanging at rest. It means the sum of the forces it's receiving is 0.

A hanging object has only two forces: The tension of the supporting string (in our case, the web) and its weight. If the object is in equilibrium, the tension is numerically equal to the weight:

T=W=m.g

The mass of the spider is m=1.81 gr = 0.00181 Kg, thus the tension is:

T = 0.00181\ Kg\cdot 9.8\ m/s^2

T=0.017738\ N

The tension in the web is 0.017738 N

4 0
3 years ago
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