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3 years ago

Which statement is true?

Physics

2 answers:

IrinaVladis [17]3 years ago

6 0

Answer:

The law of equal areas suggests that the imaginary line connecting the Sun to a planet sweeps out equal areas, but in a faster time period the closer the planet is to the Sun.

Explanation:

Fynjy0 [20]3 years ago

4 0

If it's Kepler's law of equal areas you're talking about,
then the first of the four statements is true.

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Which of these is a biotic factor? <br> A) topography <br> B) soil <br> C )air <br> D)bacteria

vitfil [10]

D I might be wroung .....i think this so the answer because biotic are all living things and bacteria is living

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3 years ago

4. All electromagnetic radiation moves at the speed of ________________, which is _________________ m/s.

VARVARA [1.3K]

Answer:

All electromagnetic radiation, regardless of its wavelength, travels at what is called the "speed of light". In a vacuum, it is measured as 299,792,458 meters per second. 3.0 x 108 meters per second.

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3 years ago

A 1.60 m tall person lifts a 2.10-kg book from the ground so it is 2.20 m above the ground. What is the potential energy of the

Viefleur [7K]

Answer:

Explanation:

Given

mass of book(m)=2.1 kg

height up to which book is lifted is (h)2.2 m

height of person $(h_0)1.6 m$

Potential energy of book relative to ground=mgh

$PE=2.1\times 9.8\times 2.2=45.276 J$

(b)PE w.r.t to person head =mg(h-h0)

$=2.1\times 9.8\times (2.2-1.6)=12.348 J$

work done by person in lifting box 2.2 m w.r.t floor

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3 years ago

A rock falls from rest off a cliff and hits the ground in 2 seconds. If there is no air resistance, determine the rock's velocit

mihalych1998 [28]

Answer:

19.6m/s

Explanation:

A Rock falling off a cliff can be modeled as an object starting with zero velocity moves with constant acceleration for certain period of time, for such motion following equation of motion can be used.

$v(t) = v_{0} +at$

here in our case $v_{0} =0$ because object starts off from rest and $a = g =9.8m/s^2$ is acceleration because of gravity ( Motion under gravity).

and of course t = 2 second.

Now by substituting all this information in equation of motion we get.

$v(2s) = 0+9.8m/s^2 *2s = 19.6m/s$

that would be the velocity of rock as it would hit the ground.

Note! We have assumed that there is no air resistance.

A rock falling off a cliff can be modeled as an object starting with zero velocity moves with constant acceleration for a certain period of time, for such motion following equation of motion can be used.

here in our case because object starts off from rest and is acceleration because of gravity ( Motion under gravity).

and of course t = 2 seconds.

Now by substituting all this information in equation of motion we get.

V = 19.6m/s

that would be the velocity of rock as it would hit the ground.

Note! We have assumed that there is no air resistance.

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3 years ago

A _____ is used in car headlights.

uysha [10]

E concave mirror because it reflects the light

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3 years ago

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