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4 years ago

What is a planet Please answer this ASAP

2 answers:

8 0

Solar System, states that a planet is a body that orbits the Sun, is massive enough for its own gravity to make it round, and has "cleared its neighbourhood" of smaller objects around its orbit.

jenyasd209 [6]4 years ago

7 0

A planet is a body positioned in the sky/outer space, observed in astronomy. It moves in an <span>elliptical orbit around a star.</span>

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A 26 foot ladder is lowered down a vertical wall at a rate of 3 feet per minute. The base of the ladder is sliding away from the

lakkis [162]

Answer:

(i) 7.2 feet per minute.

(ii) No, the rate would be different.

(iii) The rate would be always positive.

(iv) the resultant change would be constant.

(v) 0 feet per min

Explanation:

Let the length of ladder is l, x be the height of the top of the ladder from the ground and y be the length of the bottom of the ladder from the wall,

By making the diagram of this situation,

Applying Pythagoras theorem,

$l^2 = x^2 + y^2-----(1)$

Differentiating with respect to t ( time ),

$0=2x\frac{dx}{dt} + 2y\frac{dy}{dt}$ ( l = 26 feet = constant )

$\implies 2y\frac{dy}{dt} = -2x\frac{dx}{dt}$

$\implies \frac{dy}{dt}=-\frac{x}{y}\frac{dx}{dt}$

We have,

$y = 10, \frac{dx}{dt}= -3\text{ feet per min}$

$\frac{dy}{dt}=\frac{3x}{10}-----(X)$

(i) From equation (1),

$26^2 = x^2 + 10^2$

$676=x^2 + 100$

$576 = x^2$

$\implies x = 24\text{ feet}$

From equation (X),

$\frac{dy}{dt}=\frac{3\times 24}{10}=7.2\text{ feet per min}$

(ii) From equation (X),

$\frac{dy}{dt}\propto x$

Thus, for different value of x the value of $\frac{dy}{dt}$ would be different.

(iii) Since, distance = Positive number,

So, the value of y will always a positive number.

Thus, from equation (X),

The rate would always be a positive.

(iv) The length of the ladder is constant, so, the resultant change would be constant.

i.e. x = increases ⇒ y = decreases

y = decreases ⇒ y = increases

(v) if ladder hit the ground x = 0,

So, from equation (X),

$\frac{dy}{dt}=0\text{ feet per min}$

3 0

3 years ago

An airplane flies with a constant speed of 560 miles per hour. How long will it take to travel a distance of 840 miles?

Vilka [71]

Answer:

t = 1.5 hours

Explanation:

Given that,

Speed of an airplane, v = 560 miles per hour

Distance, d = 840 miles

We need to find the time taken to cover a distance of 840 miles.

$v=\drac{d}{t}\\\\t=\dfrac{d}{v}\\\\t=\dfrac{840}{560}\\\\t=1.5\ h$

So, the required time is 1.5 hours.

5 0

3 years ago

Which color of visible light has a higher frequency than blue light?

jasenka [17]

The answer I think is Violet :))

8 0

3 years ago

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Which of the following is the most accurate statement of the law of conservation of momentum?

Nikolay [14]

Answer:

Every option is correct except option C.

Option A is the most accurate statement of the law

Explanation:

C is incorrect because momentum of the SYSTEM is conserved and not necessarily that of the individual objects in the System.

For option B, momentum is a vector quantity but it does not describe the principal of conservation of momentum. Option D is also correct but does not state anything about the conservation of momentum.

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3 years ago

Is Bytes a scalar or vector?

melisa1 [442]

It is a scaler because it’s only fully describes by a magnitude and a numerical alone

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3 years ago

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