3 years ago

How many times does the world go around

1 answer:

6 0

I'm not sure what you're asking but the earth has the ability to infinitely continue to spin or the earth completes 365.25 rotations during a full cycle.

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Which of the following is true about density and states of matter for most substances?

anyanavicka [17]

The right answer is "A) Substance is denser as a solid than as a gas" Trust me I just got it wrong because of this guy down here or girls not trying to judge

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3 years ago

Light travels faster than anything else in the universe A. True B. False

Alona [7]

A because light is the fastest thing on this earth

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3 years ago

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Two identical objects A and B fall from rest from different heights to the ground. If object B takes twice as long as object A t

Yuki888 [10]

Answer:

1:4

Explanation:

We have, two identical objects A and B fall from rest from different heights to the ground.

Object B takes twice as long as object A to reach the ground. It is required to find the ratio of the heights from which A and B fell. Let $h_A\ \text{and}\ h_B$ are the height for A and B respectively. So,

$\dfrac{h_A}{h_B}=\dfrac{(1/2)gt_A^2}{(1/2)gt_B^2}\\\\\dfrac{h_A}{h_B}=\dfrac{t_A^2}{t_B^2}$

We have,

$t_B=2t_A$

So,

$\dfrac{h_A}{h_B}=\dfrac{t_A^2}{(2t_B)^2}\\\\\dfrac{h_A}{h_B}=\dfrac{1}{4}$

So, the ratio of the heights from which A and B fell is 1:4.

7 0

3 years ago

Evaluate the expression a+b when a=23 and b=45 . Write in simplest form

Viefleur [7K]

If a = 23 and b = 45

a + b = ?

23 + 45 = 68

6 0

3 years ago

At approximately what wavelength of the continuous spectrum will the greatest (maximum) intensity occur when 60-kV electrons str

inna [77]

Answer: 20 pm=20*10^-12 m

Explanation: To solve this problem we have to use the relationship given by:

λmin=h*c/e*ΔV= 1240/60000 eV=20 pm

this expression is related with the bremsstrahlung radiation when a flux of energetic electrons are strongly stopped hitting to a catode. The electrons give their kinetic energy to the atoms of the catode.

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3 years ago