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3 years ago

Number of valence electrons for calcium?

Physics

2 answers:

zimovet [89]3 years ago

7 0

Calcium has 2 valence electrons

marin [14]3 years ago

4 0

Two. Calcium is a Group 2 elementall elements in that group have two valence electrons.

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Explain how energy is conserved when nuclear fission or fusion occurs

ollegr [7]

The mass lost in the nuclear reaction is all converted to energy.

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3 years ago

Read 2 more answers

A(n) 930 N crate is being pushed across a level floor by a force of 400 N at an angle of 20◦ above the horizontal. The coefficie

Nana76 [90]

Answer:

The magnitude of the acceleration of the box is $2.291\,\frac{m}{s^{2}}$ .

Explanation:

The free body diagram of the crate is included as attachment, whose equations of equilibrium are described below:

$\Sigma F_{x} = P\cdot \cos 20^{\circ} - \mu_{k}\cdot N = \left(\frac{W}{g}\right)\cdot a$

$\Sigma F_{y} = P\cdot \sin 20^{\circ} + N - W = 0$

From second equation of equilibrium we find an expression for the normal force and find the respective value:

$N = W - P \cdot \sin 20^{\circ}$

$N = 930\,N - 400\cdot \sin 20^{\circ}\,N$

$N = 793.192\,N$

Lastly, the acceleration experimented by the crate during pushing is cleared in the first equation of equilibrium and consequently calculated:

$a = \frac{P\cdot \cos 20^{\circ}-\mu_{k}\cdot N}{\frac{W}{g} }$

$a = \frac{400\cdot \cos 20^{\circ}\,N-0.20\cdot (793.192\,N)}{\frac{930\,N}{9.807\,\frac{m}{s^{2}} } }$

$a = 2.291\,\frac{m}{s^{2}}$

The magnitude of the acceleration of the box is $2.291\,\frac{m}{s^{2}}$ .

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3 years ago

Question 7 (2 points)

DiKsa [7]

This has to do with independent and dependent variables. The independent variable is what affects the dependant variable, so the question is, does a students mark on a test affect their hours of sleep or does their hours of sleep affect their test results? Which one makes more sense? I would say the latter.

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The end of it with the dent

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If a light source (such as a light bulb) appears white, then it must _________ all colors of light.

pishuonlain [190]

Emit means put out so, emit

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