A 2-kg bowling ball is 2.5 meters off the ground on a post when it falls. Just before it reaches the ground, it is traveling 7 m/s. Assuming that there is no air resistance, which statement is true?The initial potential energy is less than the final kinetic energy.

The intial potential energy is greater than the final kinetic energy.

The mechanical energy is conserved.

The mechanical energy is not conserved.

Answers

Answer 1

Answer:

Answer: The correct answer is option "The mechanical energy is conserved".

Explanation:

Mechanical energy = Kinetic energy + Potential Energy

Mechanical energy of the body is defined a sum of potential energy and kinetic energy possessed by the body in motion. It is the energy associated with position and motion of the body.

The principle of Conservation of Mechanical Energy states that the mechanical energy of the body remains constant as long as the forces acting on the body are conservative forces.

From, this we can say that mechanical energy of the bowling ball with mass of 2 kg falling at speed of 4.4 m/s will remain conserved.

Hence,the correct answer is "The mechanical energy is conserved".

Answer 2

Answer:

The answer to your question would be The mechanical energy is conserved. I just took the test and it was right.

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PLEASE HELP!!!A vacuum flask keeps its contents warmer or cooler than the surrounding environment for a length of
time. It consists of two flasks, one inside the other, that connect at the neck. The space between the two
flasks is completely empty of air.

Q-Why does the design of the vacuum flask minimize heat transfer by conduction?

A)- One flask is smaller than the other flask.
B)- One flask is more reflective than the other flask.
C)- There is no air between the two flasks.
D)- The two flasks do not touch each other, except at the neck.

Answers

Answer is: C) There is no air between the two flasks.

Heat in this example can transfer throw thermal conduction.

Because there are no mo molecules to transfer heat, there is no conduction.

Thermal conduction is the transfer of heat through physical contact. Thermal conduction is the transfer of heat by microscopic collisions of particles. Heat spontaneously flows from a hotter to a colder body.

The process of heat conduction depends on four basic factors: the temperature gradient, the cross section of the materials involved, their path length and the properties of those materials.

Because there are no mo molecules to transfer heat, there is no conduction.

C. Heat could easily travel through the molecules in the air and escape/enter the flask. Removing the air slows down the heat transfer.

How many grams of chloride ions are in 8.3 g of copper (II) chloride

Answers

$4.4\; {\rm g}$ .

Explanation

Refer to a modern periodic table for relative atomic mass:

Cu- 63.546;
Cl- 35.45.

Formula of copper (II) chloride: CuCl₂.

Formula mass of copper (II) chloride:

63.546 + 2 × 35.45 = $134.446\; {\rm g \cdot mol^(-1)}$ .

How many ${\rm mol}$ of formula units in 8.3 grams of CuCl₂?

$(8.3\; {\rm g}) / (134.446\; {\rm g \cdot mol^(-1)}) \approx 0.0617\; {\rm mol}$

Note the subscript "2" in the formula CuCl₂. There are $2\; {\rm mol}$ of chloride ions in every $1\; {\rm mol}$ formula unit of CuCl₂.

There would be $2 * 0.0617\; {\rm mol} \approx 0.123\; {\rm mol}$ of ${\rm Cl^(-)}$ ions in $0.0617\; {\rm mol}$ formula units of CuCl₂.

The mass of $1\; {\rm mol}$ of chloride ion is 35.45 grams.

The mass of $0.123\; {\rm mol}$ of ${\rm Cl^(-)}$ ions will be $35.45 * 0.123 \approx 4.4\; {\rm g}$ .

Round the final value to two sig. fig. since the mass in the question is also 2 sig. fig.

Which compound of an element in period 3 reacts with water to form a solution with a pH greater than 7?A. SiO2
B. SiCl4
C. NaCl
D. Na2O

Answers

The compound of an element in period 3 that reacts with water to form a solution with a pH greater than 7 is:

D. Na₂O (sodium oxide)

In period 3 of the periodic table, the elements are sodium (Na) and silicon (Si), among others. Let's analyze the options:

A. SiO₂ (silicon dioxide) does not react with water to form a solution with a pH greater than 7. It is an acidic oxide and can react with water to form a weakly acidic solution.

B. SiCl₄ (silicon tetrachloride) is not a compound that reacts with water to form a solution with a pH greater than 7. It hydrolyzes with water to produce hydrochloric acid, which leads to a decrease in pH (more acidic).

C. NaCl (sodium chloride) does not react with water to form a solution with a pH greater than 7. It is a neutral compound and does not affect the pH of water.

D. Na₂O (sodium oxide) reacts vigorously with water to form sodium hydroxide (NaOH), a strong base. Sodium hydroxide is highly soluble in water and completely dissociates into hydroxide ions (OH⁻) and sodium ions (Na⁺). The presence of hydroxide ions in the solution makes it basic, resulting in a pH greater than 7.

Therefore, the correct answer is D. Na₂O (sodium oxide).

To know more about compound here

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The answer is D. Nasub(2)O.
Nasub(2)O + H2O --> 2 NaOH
Nasub(2)O solution has pH much higher than 7

What are the elements in group 3 to 12 called?

Answers

In groups 3-12 the elements are called Transition metals

The Transition Metals

What is the opposite of ductile and malleable?

PLEASE HELP!!!! I NEED THIS TONIGHT!!!

Answers

ductility = brittleness
malleability = immalleability, rigidity

Opposite of malleable is rigidity and opposite of ductile is brittleness.

Which of the following summarizes photosynthesis?glucose + carbon dioxide → oxygen + water
carbon dioxide + water → glucose + oxygen + water
oxygen + water → glucose + carbon dioxide + water
carbon dioxide + oxygen → glucose + oxygen + water

Answers

carbon dioxide + water → glucose + oxygen + water

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