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3 years ago

12

A light ray is striking the surface of Earth. Which factor would make the light ray more likely to be absorbed than reflected? l

ight colors smooth surfaces the winter season the high angle of the Sun

2 answers:

vichka [17]3 years ago

7 0

Answer:

The answer is D

Explanation:

Because the other options do not make since.

Vladimir [108]3 years ago

5 0

Answer:

B

Explanation:

Trust

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Two identical satellites orbit the earth in stable orbits. One satellite orbits with a speed v at a distance r from the center o

jolli1 [7]

Answer:

c)At a distance greater than r

Explanation:

For a satellite in orbit around the Earth, the gravitational force provides the centripetal force that keeps the satellite in motion:

$G\frac{Mm}{r^2}=m\frac{v^2}{r}$

where

G is the gravitational constant

M is the Earth's mass

m is the satellite's mass

r is the distance between the satellite and the Earth's centre

v is the speed of the satellite

Re-arranging the equation, we write

$r = \frac{GM}{v^2}$

so we see from the equation that when the speed is higher, the distance from the Earth's centre is smaller, and when the speed is lower, the distance from the Earth's centre is larger.

Here, the second satellite orbit the Earth at a speed less than v: this means that its orbit will have a larger radius than the first satellite, so the correct answer is

c)At a distance greater than r

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3 years ago

In designing circular rides for amusement parks, mechanical engineers must consider how small variations in certain parameters c

Bess [88]

Answer:

Part a)

$dF = -\frac{mv^2}{r^2} dr$

Part b)

$dF = \frac{2mvdv}{r}$

Part c)

$dT = - \frac{2\pi r}{v^2} dv$

Explanation:

Part a)

As we know that force on the passenger while moving in circle is given as

$F = \frac{mv^2}{r}$

now variation in force is given as

$dF = -\frac{mv^2}{r^2} dr$

here speed is constant

Part b)

Now if the variation in force is required such that r is constant then we will have

$F = \frac{mv^2}{r}$

so we have

$dF = \frac{2mvdv}{r}$

Part c)

As we know that time period of the circular motion is given as

$T = \frac{2\pi r}{v}$

so here if radius is constant then variation in time period is given as

$dT = - \frac{2\pi r}{v^2} dv$

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3 years ago

Sphere is fired downwards into a medium with an initial speed of 27 m/s. If it experiences a

anygoal [31]

Answer:

33 m/s

first i do 27+6=33 +s2=

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3 years ago

A wind turbine is an example of what kind of device

Liula [17]

Answer:

it’s an example of a generator.

Explanation:

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2 years ago

Explain and derive the equation for capillary action in the phenomenon of surface tension

lapo4ka [179]

Answer:

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3 years ago