Chemistry, 25.07.2019 18:30 SapphireWolf

Asteel block has a volume of 0.08 m³ and a density of 7,840 kg/m³. what is the force of gravity acting on the block (the weight) in water? a. 6,150.64 n b. 5,362.56 n c. 7,600.18 n d. 6,700.56 n

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Correct Option a. 6150.64 N

Weight (w) is defined as:

w = mg

So, first we need to find the mass (m) of the steel block using its volume and density.

Mass = Density x Volume
So,
m = 0.08 x 7840 = 627.2 g

Using value of m and g = 9.807, we get

w = 627.2 x 9.807 = 6150.95 Newtons

Therefore, option a is the correct answer.
The slight difference is because the value of g is rounded of to 3 decimal cases.

Answer from: Quest

assuming that your periodic table has eighteen columns, you should highlight the four elements in the third column from the left of the table.

explanation

neutral atoms of elements after calcium contain d electrons. the energy of d orbitals of a particular main shell lies between the energy of the s and p orbitals of the next main shell. for example, electrons in the $3d$ have energy higher than those in the $4 s$ orbital while lower than those of the $4 p$ orbital.

by the aufbau principle, electrons fill orbitals one at a time, starting from those of the lowest energy. the $4s$ orbital is therefore filled right after $3p$ orbitals and before $3 d$ orbitals.

potassium has electron configuration $[\text{ar}] 4 s^{1}$ and calcium $[\text{ar}] 4 s^{2}$ . the s orbital of a main shell holds a maximum of two electrons. the next element would thus have the electron configuration $[\text{ar}] 4 s^{2} \; 3d^{1}$ and satisfy the requirements.

a neutral atom of the element contains three electrons on top of the most recent noble gas element. it should thus be placed in the third column of the periodic table. both scandium and yttrium would satisfy the conditions. an aufbau diagram indicates that the 4f orbital is filled before the 5d. however, it appears that exceptions exists for both lanthanum and actinium. neutral atoms of the two d-block elements also demonstrate the $ns^{2} \; (n-1) p^{1}$ and should be highlighted as well.

Answer from: Quest

the earth would become to overheated and everything alive on it will eventually die from overheating. plants will eventually die as well, water will evaporate, and it will be nothing but a hot planet without anything living on it.