I need help with questions #2 and #3

Answer:

0i,63.5j. Just see i as x and j as y

Answer:

The mass number of this carbon atom is 12.

Explanation:

Mass number = Number of protons + Number of neutrons  =  6 + 6  = 12

Brainlist pls!

Answer:

6

Explanation:

Answer:

A

Explanation:

The gold used in the making of jewelry is usually not pure but a heterogeneous mixture of metals. Pure gold is quite soft and even though it may look better in appearance compared to those made using heterogeneous mixtures, it usually bends easily. Hence, in order to make the jewelry more durable, gold is usually mixed with other metals to form a heterogeneous mixture.

The correct option is A.

Answer:

when Metallic oxide reacts with water they form metallic hydroxide which are basic in nature

Answer:

x = ~0.1289 m/s^2

Explanation:

We can use one of the kinematic formulas. We see that the equation doesn’t contain the final velocity, so we use the kinematic equation d = v_0t + (1/2)at^2.

Since the train started from rest, the initial velocity, v_0, is 0. Thus, the equation becomes:

d = (1/2)at^2

Note that 5 minutes is 300 seconds and 5.8 km is 5800 m. Substituting the values we are given, we get:

5800 m = (1/2)(x m/s^2)(300 s)^2 = (45000 s^2)(x m/s^2)

Dividing by 45,000 on both sides, we get:

x = ~0.1289 m/s^2

I hope this helps! :)

Answer:

Collateral Damage

Explanation:

Answer:

The answer is Wave

Explanation:

Kinetic energy = 29.912 J

Given

mass = 0.155 kg

vo=initial velocity = 31.4 m/s

h/d=30 m

Required

KE=kinetic energy

Solution

vt²=vo²-2ad⇒vt=final velocity

vt²=31.4²-2.10.30⇒g=10 m/s²

vt²=985.96-600

vt²=385.96 m/s

Kinetic  energy (KE)

[tex]\tt KE=\dfrac{1}{2}mv^2\\\\KE=\dfrac{1}{2}\times 0.155.\times 385.96\\\\KE=29.912~J[/tex]

Answer:

The answer is 30.8 (J)

Explanation:

You're welcome

Answer:

Stress = 4.67 * 10^-7 N/m²

Explanation:

Young's modulus of the material = Stress/Strain

Given

Young's modulus  = 228 x 10^9 Pa

Stress =  106,483 Pa

Required

Strain

From the formula;

Strain = Stress/Young modulus

Strain =  106,483 /228 x 10^9

Stress = 4.67 * 10^-7 N/m²

Answer:

The horizontal component of the velocity is 49.85 m/s.

Explanation:

Rectangular Components of a Vector

A 2D vector can be expressed in several forms. The rectangular form gives its two components, one for each axis (x,y). The polar form gives the components as the pair (r,θ) being r the magnitude and θ the angle.

When the magnitude and angle of the vector are given, the rectangular components are calculated as follows:

[tex]v_x=v\cos\theta[/tex]

[tex]v_y=v\sin\theta[/tex]

Where v is the magnitude of the vector and θ is the angle with respect to the x positive direction.

The cart is moving at v=55 m/s at θ=25°, thus:

[tex]v_x=55\cos 25^\circ[/tex]

[tex]v_x=49.85\ m/s[/tex]

The horizontal component of the velocity is 49.85 m/s.

1. BaCl2+K2SO4⇒BaSO4+KCl

2. Na+FeCl3⇒Fe+NaCl

Given

Word equation

Required

Skeleton equation

Solution

A chemical reaction can be expressed in terms of:  

The skeleton equation is still in unbalanced form  

So only chemical formulas of reactants and products and the relative amounts of the reactants and products are not included

For example :

• word equation

Ethane + Oxygen ⇒ Carbon dioxide + Water

• skeleton equation

C₂H₆ + O₂ ⇒ CO₂ + H₂O

• balanced equation

2C₂H₆ + 7O₂ ⇒ 4CO₂ + 6H₂O

1.

word equation

barium chloride ____ + potassium sulfate ____ → barium sulfate _____ + potassium chloride _____

skeleton equation

BaCl2+K2SO4⇒BaSO4+KCl

2.

word equation

sodium+iron(III) chloride→iron+sodium chloride

skeleton equation

Na+FeCl3⇒Fe+NaCl

Answer:

Acceleration

Explanation:

The choice from the given option which is not a force is acceleration.

Acceleration is defined as the rate of change of velocity of a body with time;

   Acceleration  = [tex]\frac{change in velocity}{time}[/tex]  

Force is a pull or push on a body. The product of mass and acceleration is force.

It's Z your welcome :)

Answer:

It is Z i believe.

Explanation:

Potential Energy = mass x gravity x height

W: 980 = (50)(9.8)(h)

X: 1029 = (35)(9.8)(h)

Y: 1519 = (62)(9.8)(h)

Z: 1176 = (24)(9.8)(h)

simplify:

W: 980 = 490h

X: 1029 = 343h

Y: 1519 = 607.6h

Z: 1176 = 235.2h

Divide from both sides of each equation:

W: (980/490) = h

X: (1029/343) = h

Y: (1519/607.6) = h

Z: (1176/235.2) = h

Simplify the left side:

W: 2 = h

X: 3 = h

Y: 2.5 = h

Z: 5=h

Answer:

SA = 5900 sqcm

Explanation:

I am assuming you meant surface area since this is a three dimensional box.  This formula for surface area (SA) is SA = 2 (wl + hl + hw).  Once you have that would just have to plug the numbers in and calculate!

Answer:

A straight line with no slope.

Answer:

C on edge 2021

Explanation:

Answer:

90.82%digrash silsho

Answer:

relative humidity increases

Explanation:

hope this helps:)

Answer:

D.

a control group

Explanation:

In a scientific experiment such as the one above, there is an experimental group and a control group. The experimental group is the group that receives the treatment while the control group does not receive any treatment. The control group helps the researcher to observe if the treatment had any significant effect.

In this case, it will help Alan and Monica to determine if fertilizer X actually had an effect on the plant. Therefore, the pot with o grams of fertilizer in it is the control group.

Answer:

The specific latent heat of ice is approximately 341 J/g

The correct option is;

b) 341 J/g

Explanation:

The given parameters are;

The mass of ice the pupil adds to the water, m₁ = 37 g

The initial temperature of the ice, T₁ = 0°C

The mass of the water to which the ice is added, m₂ = 100 g

The initial temperature of the water, T₂₁ = 30°C

The final temperature of the water and the melted ice, T₂₂ = 0°C

The specific heat capacity of the water, c₂ = 4.2 J/(g·°C)

By the principle of conservation of energy, we have;

The heat gained by the ice = The heat lost by the water = ΔQ₂

Given that the ice is only melted with no change in temperature, we have;

The heat gained by the ice = The latent heat needed for melting the ice

ΔQ₂ = m₂ × c₂ × (T₂₂ - T₂₁) = 100 × 4.2 × (0 - 30) = -12,600 J

The heat gained by the ice = m₁ × [tex]L_f[/tex]

Where;

[tex]L_f[/tex] represents the specific latent heat of fusion of ice;

We have;

12,600 = 37 × [tex]L_f[/tex]

[tex]L_f[/tex] = 12,600/37 = 340.54 J/g ≈ 341 J/g

The specific latent heat of fusion of ice = [tex]L_f[/tex] ≈ 341 J/g.

Answer: the answer is c

Answer:

The OatMeal

Explanation:

Answer:

C.) The Oatmeal


Since the oatmeal is the hottest it will spread the other substances which will increase the temperature of the milk, spoon, and the surrounding air.

The oatmeal had the most thermal energy out of the four options; the milk was cool, the spoon was at room temperature and the surrounding air was also at room temperature. Therefore, the heat from the oatmeal will travel to those substances and change their thermal energy.

Explanation:

Have a great rest of your day
#TheWizzer

Answer:Earthquakes are measured using seismographs, which monitor the seismic waves that travel through the Earth after an earthquake strikes. Scientists used the Richter Scale for many years but now largely follow the “moment magnitude scale,” which the U.S. Geological Survey says is a more accurate measure of size.

Answer:

Explanation:

Force = (mass) · (acceleration)

= (1,000 kg) · (9.8 m/s²)

= 9,800 newtons

Answer:

My best friend lol cuz since quarantine i didn't see her

Answer:

553.74≤x≤578.26

Explanation:

The formula for calculating the confidence interval is expressed as

CI = xbar±(z×s/√n)

xbar is the mean = 562

s is the standard deviation = 26.1

n is the sample size = 35

z is the z score at 90% CI = 1.645

Substitute the values into the formula

CI = xbar±(z×s/√n)

CI = 561±(1.645×26.1/√35)

CI = 561±(1.645×4.412)

CI = 561±7.257

CI = {561-7.257, 571+7.257}

CI = {553.74, 578.26}

Hence the 90% confidence interval estimate of the name of the population is 553.74≤x≤578.26

Explanation:

gas vibrate and move freely at high speeds, liquid vibrate, move about and slide past each other. solid vibrate (jiggle) but generally do not move from place to place

Answer:

atomic 11

Explanation:

atomic 11 Na is metal

Answer:

Explanation:

The momentum of an object can be found by using the formula

momentum = mass × velocity

From the question we have

momentum = 2000 × 35

We have the final answer as

Hope this helps you

Answer:

P = m g v

Explanation:

Power is defined as the relationship between work and time

        P = W / t

The work is defined by the scalar product of the force and the displacement, in the case of a drop falling the vertical force and the displacement has the same direction, therefore the angle between them is zero and the cosines of zero is one (cos 0 = 1)

       W = F y

the gravitational force is proportional to the weight of the drop  (F = mg)

        W = mg y

we substitute

       P = m g y / t

the terminal velocity of the drop is constant

       P = m g v