Which statements about acceleration are true?
Check all that apply.
A. Acceleration is found by dividing the change in speed by the
change in time.
B. Acceleration is a vector quantity.
C. The symbol used for acceleration is a
D. The SI units for acceleration are m/s^2

Answer: 16.3 kcal

Explanation:

Given that the reaction releases 68 kJ or 68000 J. One cal is  4.184 J. Thus, 68000 J is 16.25 kilocalories.

An exothermic reaction is the reaction which evolves heat energy to the surroundings. The given reaction is an exothermic double displacement reaction.

The given reaction involves the displacement of nitrate and Cl groups in between silver metal and hydrogen. This reaction releases a heat of 68kJ or 68000 J

given, 1 cal of energy = 4.184 J

hence, 68000 J = 68000/4.184  = 16252 cal

One kilocalorie = 1000 calories

thus, 16252 calories = 16.25 kilocalories.

Therefore, the given reaction, releases 16.25 kilocalories of energy.

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I believe you got it correct already

Answer:

The connection between the two is that potential energy transforms into kinetic energy

Explanation:

We know that potential energy is the energy that is stored within an object while kinetic energy is the energy that is in motion.

Answer:A

Explanation: my teacher told me lol

The option that is not a change that occurred to organisms over time in the fossil record is A. Decrease in the number of species

A fossil record simply refers to the history of the life of the fossils. It means the remains of imprints of the organisms that are from earlier geological periods.

It should be noted that the fossil record is important to archeologists as it helps in placing events in their appropriate eras.

A change that didn't occur to the organisms over time in the fossil record is the decrease in the number of species.

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Answer: True - doing both tasks at once is attempting to do two things at once which means you are dividing your attention.

Answer:

true

Explanation:

Answer:

On molecules of PH3, there has to be 3 atoms.

Explanation:

The Element Hydrogen (H) has 3 attoms.

The Element Phosphorus (P) has 1 atom.

These two created into the molecule PH3, would have to have only 3 attoms because they are asking how many hydrogens atoms are in the molecule PH3.    

Answer:

When boiling water is poured into a thick tumbler its inner surface expands. However, due to low thermal conductivity of glass, the expansion of outer surface of the tumbler is quite small. Due to uneven expansion of the outer and inner surfaces, the tumbler breaks.

Explanation:

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Answer:

d) 5 Ns

Explanation:

Impulse = Ft = 1,000(0.005) = 5

Answer:

The force exerted between the two charges is 0.0001248N

Explanation:

we will be using Columb's law to solve this problem.

Columb's law explains that the Force between two charged bodies is directly proportional to the product of their charges and inversely proportional to the square of the distance between them.

Mathematically,

[tex]F = K\frac{Q_1 \times Q_2}{r^2}[/tex]

WHere K = constant of proportionality = [tex]8.9875 \times 10^9 N m^2/c^2[/tex]

[tex]F = 8.9875 \times 10^9 \times\frac{2.5 \times10^{-6} \times 4.5 \times 10^{-7}}{9^2}= 0.0001248N[/tex]

The force exerted between the two charges is 0.0001248N

Answer:

Option B. The distance between the objects in Figure A is shorter than the distance between the objects in Figure B.

Explanation:

The force of attraction between two masses is given by the following equation:

F = GM₁M₂ / r²

Where:

F => is the force of attraction

M₁ and M₂ => are the masses of the two objects

G => is the gravitational constant.

r => is the distance between the two objects

From the above formula,

The force of attraction (F) is directly proportional to the product of the two masses and inversely proportional to the square of their apart.

This implies that:

1. An increase in the masses of the object will bring about an increase in the force of attraction and a decrease in the masses will leads to a decrease in the force of attraction.

2. An increase in the distance between the two masses will leads to a decrease in the force of attraction and a decrease in the distance between the two masses will lead to an increase in the force of attraction.

Considering the options given in the question above, option B gives the correct answer to the question.

Answer:

When two objects collide, a force is exerted on each object. The two forces are in opposite directions but the same strength. Even though the force on each object in a collision is the same strength, the objects will have different velocity changes if their masses are different.

Explanation:

*sighs* can u please give me brainliest-..... I'm literally crying....lol but PLEASE BRAINLIEST PLEASEEEE T_T

Answer:

Radiation, as it is not directly above but it is off to the side

Explanation:

Answer:

Processes are all the related activities (parts) inside the system that work together to make it function. ... It's important that processes are effective at what they do so that the system can run efficiently. Processes are the sequence of activities intended to produce a particular result.

Explanation:

Answer:A process is an instance of a program running in a computer. It is close in meaning to task, a term used in some operating system

Answer:

3 miles

Explanation:

5 + 2 - 2 - 2 = 3 miles

Answer:

a. Acceleration, a = 1.88 m/s²

b. Time, t = 7.87 seconds.

Explanation:

Given the following data;

Initial velocity, U = 14.5m/s

Final velocity, V = 29.3m/s

Distance, S = 172m

a. To find the acceleration of the speedboat;

We would use the third equation of motion;

V² = U² + 2aS

Substituting into the formula

29.3² = 14.5² + 2a*172

858.49 = 210.25 + 344a

344a = 858.49 - 210.25

344a = 648.24

a = 648.24/344

Acceleration, a = 1.88 m/s²

b. To find the time;

We would use the first equation of motion;

V = U + at

29.3 = 14.5 + 1.88t

1.88t = 29.3 - 14.5

1.88t = 14.8

Time, t = 14.8/1.88

Time, t = 7.87 seconds.

Explanation:

2. Power is defined as the rate of doing work. Mathematically, it can be given by :

[tex]P=\dfrac{W}{t}[/tex]

Where

W is work done or energy

t is the time taken

3. The formula of potential energy can be given by :

[tex]P=mgh[/tex]

Where

m is the mass of the object

g is the acceleration due to gravity

h is height

Hence, this is the required solution.

Answer:     I

dk what rhe answer is but here is my prediction :)

Explanation:

If the rope is horizontal and the ball's speed is 10 m/s, what is the tension in the ... A 2 kg iron ball is swung in a horizontal circular path at the end of a 1.6 m length of rope. ... Freddie swings a 2 kg stone at the end of a thin rope of length 1.2 m. ... of an automobile tire that turns with a frequency of 11 Hz and has a linear speed ...

Answer: The mesocyclone

Explanation: The unsaturated air, if moved upward, will be cooler than the surrounding air and it will sink. ... This convective action (that is, the circulation of air as a result of heat transfer) produces the huge clouds commonly associated with thunderstorms and tornadoes.

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Pick any free letter for each trait. For example, "A" for the dominant allele and "a" for the recessive allele for the number of arms. Assuming complete dominance, the genotype for the dominant trait will always have at least one "capital" allele, so a creature with 2 arms would have genotype either AA (homzygous dominant) or Aa (heterozygous), while a creature with the recessive trait of having 4 arms will always be homzygous recessive with genotype aa.

Answer: 21000 kg*m/s

Explanation: Momentum is mass times velocity or p=mv where p represents momentum so...

3,500kg*6m/s= 21,000kg*m/s

Answer:

The magnitude of the surface charge density on either plate is approximately 5.41 × 10⁻⁸ C/(m²)

Explanation:

The magnitude of the charge on each of the conducting plates = Equal

The orientation of the charges on each plate = Opposite charges

The magnitude of the point charge placed between the plates = +3.60 nC

The force acting on the point charge, q = 22.0 μN

Therefore, we have;

F = E × q

E = F/q = 22.0 μN/+3.60nC = 6,111.1111 V/m

We have;

[tex]E = \dfrac{\rho }{\epsilon_0}[/tex]

Where;

ρ = The surface charge density

ε₀ = Absolute permittivity ≈ 8.85 × 10⁻¹² C²/(N·m²)

Therefore, we have;

ρ = E × ε₀ = 6,111.1111 V/m × 8.85 × 10⁻¹² C²/(N·m²) = 5.40833332 × 10⁻⁸ C/(m²)

∴ The magnitude of the surface charge density on either plate, ρ ≈ 5.41 × 10⁻⁸ C/(m²).

Answer:

140m/s

Explanation:

V=V0+at. V=20+40*3=140m/s

The object moved a displacement of 1125 m.

Velocity of an object is defined as the time rate of change of its displacement.

Here,

Velocity of the object, v = 75 m/s

Time taken for travelling, t = 15 s

We know that, the velocity is the displacement covered per unit time.

v = d/t

Therefore, the displacement covered by the object,

d = v x t

d = 75 x 15

d = 1125 m

Hence,

The object moved a displacement of 1125 m.

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Answer:

Convection is what keeps the hurricane going in till the storm hits land.

Explanation:

Convection is the warm, moist current that rises above sea level and as it cools into water vapor it releases energy which a hurricane runs on. Once the hurricane hits land it continues to lose energy to keep it going because there's no convection from the sea currents rising above sea level to release energy.

Hope this helps.