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3 years ago

13

By what factor will the acceleration due to gravity change if the mass of a planet is doubled and the size of the planet is also

doubled?

1 answer:

stiks02 [169]3 years ago

3 0

Answer:

The answer is given in the attacted image.

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Which method can be used for separating a mixture of sand and salt?

Veronika [31]

Answers A and C can be automatically eliminated because evaporation has to do with the water cycle and magnetism has to do with electric current and such. Next we can eliminate B or distillation because it also has to do with water/liquids. Therefore, the answer is D or filtration because it is the only answer left.

I hope this helps!

6 0

2 years ago

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Calculate the amount of heat (in kJ) required to convert 97.6 g of water to steam at 100° C. (The molar heat of vaporization of

Ratling [72]

Answer:

221.17 kJ

Explanation: Note the heat of vaporization is in kJ/mol,then to determine the number of moles of water: divide the mass by 18. Then multiply the number of moles by the molar heat of vaporization of water.

N = 97.6 ÷ 18

Q=molar heat *moles

Q = (40.79) * (97.6 ÷ 18)

This is approximately 221.17 kJ

4 0

2 years ago

You walk 45 m to the north, then turn 90° to your right and walk another 45 m How far are you from where you originally started?

docker41 [41]

C^2=a^2+b^2
c^2=45^2+45^2
c^2=4050
c=63.64
c=64
The answer is D.

3 0

3 years ago

It takes 4.0 eV to excite an electron in a box from the ground level to the first excited level. What is the width L of the box?

AveGali [126]

To solve this problem we will use the concept related to electrons in a box which determines the energy of an electron in that state.

Mathematically this expression is given by,

$E_n= \frac{n^2h^2}{8mL^2}$

Where,

m = mass of an electron

h = Planck's constant

n = is the integer number of the eigenstate

L = Quantum well width

The change in energy must be given in state 1 and 2, therefore

$\Delta E = E_2 - E_1$

$\Delta E = \frac{2^2h^2}{8mL^2}-\frac{1^2h^2}{8mL^2}$

$\Delta E = \frac{3h^2}{8mL^2}$

Replacing we have:

$(4*1.6*10^{-19}) = \frac{3(6.626*10^{34})}{8*(9.11*10^{-31})*L^2}$

$L = 0.53nm$

Therefore the correct answer is C.

6 0

3 years ago

The amount of matter in an object is called its weight true or false

Deffense [45]

Answer:

true

Explanation:

logic

4 0

2 years ago

Read 2 more answers