Help me please, help

Answer:

1. 12 cm

2. 0.133 m

3. 0.03 m

4. Plane mirror

Virtual image

Upright

Behind the mirror

The same size as the object

Concave mirror when the object is located a distance greater than the focal length from the mirror's surface

Real image

Inverted image

In front of the the mirror

Diminished when the object is beyond the center of curvature

Same size as object when the object is placed at the center of curvature

Enlarged when the object is placed between the center of curvature of the mirror and the focus of the mirror

Concave mirror when the object is located a distance less than the focal length from the mirror's surface

Virtual image

Upright image

Behind the the mirror

Enlarged

Convex mirror

Type = Virtual image

Appearance = Upright image

Placement = Behind the mirror

Size = Smaller than the object

Explanation:

1. For plane mirror, since there is no magnification, the virtual image distance from the mirror = object distance from the mirror = 12 cm behind the mirror

2. The height of the object = 0.3 m

The distance of the object from the mirror = 0.4 meters

Height of image formed = 0.1 meter

We have;

[tex]Magnification, \ m = \dfrac{Image \ height }{Object \ height } = \dfrac{Image \ distance \ from \ mirror }{Object\ distance \ from \ mirror }[/tex]

[tex]m = \dfrac{0.1}{0.3 } = \dfrac{Image \ distance \ from \ mirror }{0.4 }[/tex]

Image distance from the mirror = 0.1/0.3×0.4 = 2/15 = 0.133 m

Image distance from the mirror = 0.133 m

3. [tex]m = \dfrac{Image \ height}{0.10 } = \dfrac{0.06 }{0.20 }[/tex]

The image height = 0.06/0.2×0.1 = 3/100 = 0.03 meter

The image height = 0.03 meter

4. Plane mirror

Type = Virtual image

Appearance = Upright image with the left transformed to right

Placement = Behind the mirror

Size = The same size as the object

Concave mirror when the object is located a distance greater than the focal length from the mirror's surface

Type = Real image

Appearance = Inverted image

Placement = In front of the the mirror

Size = Diminished when the object is beyond the center of curvature

Same size as object when the object is placed at the center of curvature

Enlarged when the object is placed between the center of curvature of the mirror and the focus of the mirror

Concave mirror when the object is located a distance less than the focal length from the mirror's surface

Type = Virtual image

Appearance = Upright image

Placement = Behind the the mirror

Size = Enlarged

Convex mirror

Type = Virtual image

Appearance = Upright image

Placement = Behind the mirror

Size = Smaller than the object.

Answer:

1. The mirror is 12 centimeters away from the image. This is a plane mirror with a flat reflecting surface. The distance between the object and the mirror surface is equal to the distance between the mirror surface and the image.

2. hiho=siso

0.1 m0.3 m=si0.4 m

Multiply each side of this equation by 0.4.

0.4×(0.10.3=si0.4)×0.4

si=0.40.3

si = 0.133 m  

3. hiho=siso

hi0.10 m=0.06 m0.02 m

Multiply each side of this equation by 0.10.

0.10×(hi0.10=0.060.20)×0.10

hi=0.0060.20

hi = 0.03 m

4.

 Image Formation

Mirror  Type  Appearance  Placement  Size  

Plane  Virtual Erect (Upright); Appears to have left and right reversed  Behind the mirror; the distance between the mirror and the image is equal to the distance between the mirror and the object  Depends on the size of the mirror and placement of the object  

Concave (when the object is located a distance greater than a focal length from mirror's surface)  Real  Inverted  In front of the mirror Smaller than the object  

Concave (when object is located a distance less than the focal length of the mirror) Virtual  Erect (Upright)  Behind the mirror Enlarged  

Convex Virtual  Erect (Upright)  Behind the mirror  Smaller than the object  

Explanation:

PENN

Conductors are the substance that transmits heat or electricity through them, insulators are basically the opposite. They prevent heat or electricity from passing through them. Semiconductors can act as either a conductor or an insulator under different conditions.

Explanation:

the colour change of PH indicator is caused by the dissociation of the H+ ion from the indicator itself recall the pH indicator are not only natural dyes but also a weak acid the dissociation of weak and Indicator causes a solution to change color

Answer:

-16°C

Explanation:

PV = nRT

V and n are constant.

P / T = P / T

(2 atm + 1 atm) / (266 K) = (1.9 atm + 1 atm) / T

T = 257.1 K

T = -16°C

Answer:

Bruh............

Explanation:

Answer:

C. 110 - 140

Explanation:

Answer:

i think the best answer is c

Answer:

1.5 u

Explanation:

The range equation is:

R = u² sin(2θ) / g

When u = v, R = 2.25 R.

2.25 R = v² sin(2θ) / g

2.25 u² sin(2θ) / g = v² sin(2θ) / g

2.25 u² = v²

1.5 u = v

Answer:

the emission of ionizing radiation or particles caused by the spontaneous disintegration of atomic nuclei.

Explanation:

HOPE I HELPED

PLS MARK BRAINLIEST

DESPERATELY TRYING TO LEVEL UP

                 ✌ -ZYLYNN JADE ARDENNE

Answer:

is the process by which an unstable atomic nucleus loses energy by radiation

Explanation:

hope this helps

Answer:

The solution(s) are in order with respect to the attachments

[tex]2.613\:\cdot10^5[/tex] Joules ; 5. Adding the same amount of heat to two different objects will produce the same increase in temperature ; 2. Same speed in both ; 2. A

Explanation:

Diagram 1 ( Liquid Nitrogen ) : So as you can see, we want our units in Joules here, and can therefore multiply the mass of gaseous nitrogen and the latent heat of liquid nitrogen, to cancel the units kg, and receive our solution - in terms of Joules. Let's do it.

q ( energy removed ) = mass of nitrogen [tex]*[/tex] latent heat of liquid nitrogen,

q = 1.3 kg [tex]*[/tex] 2.01 [tex]*[/tex] 10⁵ J / kg = [tex]1.3\:\cdot \:2.01\:\cdot \:\:10^5[/tex] = [tex]10^5\cdot \:2.613[/tex] = [tex]100000\cdot \:2.613[/tex] = [tex]261300[/tex] Joules = [tex]261.3[/tex] kiloJoules = 2.613 [tex]*[/tex] 10⁵Joules is the energy that must be removed

Diagram 2 : The same amount of heat does not necessarily mean the same increase in temperature for two different objects. The increase in temperature depends on the specific heat capacity of the substance. Therefore your solution is 5 ) Adding the same amount of heat to two different objects will produce the same increase in temperature.

Diagram 3 : The temperatures in both glasses are the same, and hence the molecules have the same average speed. Therefore your solution is 2 ) Same speed in both.

Diagram 4 : Glass A has more water molecules, and hence has more thermal energy. Your solution is 2 ) A.

Answer:

U = 5/2 NkT.

Explanation:

A diatomic molecule = H₂, O₂, N₂ .....etc

A diatomic molecule has 5 degrees of freedom.

So,  the internal energy for diatomic gases is :

U = 5/2 NkT.

Answer:

A

Explanation:

A dynamic equilibrium is a chemical equilibrium between a forward reaction and the reverse reaction where the rate of the reactions are equal.

The rate of the forward reaction equals the rate of the backward reaction.

For a system to be in dynamic equilibrium, the forces should be balanced.

According to chemistry, Dynamic equilibrium is all about the equal rate of change in reactants and products, i.e., there will be a steady state. Also in Physics, if though the number of the composition of mixtures happens and that does not change with time, i.e., it is equilibrium constant. For example, when the car moving on the road, there will be some friction. The forward force of the car happened due to friction but no other force has changed at car's constant speed. When the net force will be same then it is known to be dynamic equilibrium.

Equilibrium constants can be determined as rate constants through reversible reaction, i.e., the rate of the forward reaction equals to the rate of the backward reaction.

Thus, option A is correct.

Learn more about dynamic equilibrium

https://brainly.com/question/26034510

#SPJ5

Answer:

1800 N

Solution:

Impulse = mΔv = m * (u - v) .

 here m = 100 kg

          u = 4 m/s

          v = -5 m/s

  impulse = 100 x ( 4 - ( -5 ) ) = 900 Kg m/s .

Average reaction Force ( Favg ) = impulse / Δt

Average reaction Force ( Favg )  = 900kg·m/s / 0.5s

Average reaction Force ( Favg )  = 1800 N

Answer The Moon has synchronous rotation: it's rotation period is the same as its period of revolution

Explanation:

The Moon has synchronous rotation: it's rotation period is the same as its period of revolution

Answer:

Purpose: To observe how an object’s position and velocity change while it is moving with a constant acceleration.

Question: How does an object’s position and velocity change as the object accelerates?

Hypothesis: If the fan speed increases, then the acceleration of the cart increases, because a greater fan speed supplies more energy to move the cart.

Variables:

• Independent variable: fan speed

• Dependent variable: acceleration of the cart

• Controlled variables: mass

Materials:

• Cart with Fan (1 kg)

• CM ruler (1 cm)

• Stop watch (0.0 cm pe sec)

• Flag

Procedure:

1. Use the setup on “Force and Fan Carts” Gizmo.

2. First, put the fan speed on low and no friction surface.

3. Press the start button and record the final time when the cart crosses the finished line. Record on table B.

4. Then, click on the data tab to record the speed data, total distance, average velocity, and acceleration. Record on table A and B.

5. After, observe the position vs. time graph with the speed and line graph toggled. Record on table C.

6. Repeat steps 2-5 on fan speed on medium and high with no friction surface.

7. Next, reset and put fan speed on low.

8. Press start and pause on 4 seconds.

9. On the same trial turn off the fan speed and hit start again.

10. Observe the graph and write observations on table D.

Analysis and Conclusion:

In conclusion, my hypothesis matches the data, because the data shows that increasing the fan speed increases the acceleration of the cart. The trends for all fan speeds are linear slope for speed. The higher the fan speed, the less time it took for the cart to cross the finish line.

Data:

Explanation:

Sorry can’t copy and paste results

Answer:

for that pervious answer why cant we copy and paste?

Explanation:

Answer:

Spurious relationship

Explanation:

In statistics a spurious relationship is a correlated mathematical  relationship of covariation between two variables or more which by themselves have no cause and effect relationship as a result of a coincidence or the existence of a third or confounding factor

The variables have covariation due to their correlation but they don't have a cause and effect relationship

An example of a spurious relationship is the increase in ice cream sales when there is an observed increase in the rate of drowning.

Answer:

Wave W is a sound wave, Waves X and Y are light waves, and it is impossible to tell what kind of wave Wave Z is.

Explanation:

W      travels fastest through metal

X       travels fastest through air,

Y       travels more slowly through water than air    

Z       travels more slowly at cool temperatures

W appears to be sound wave  as sound travels fastest through metal .

X appears to be light wave as light travels fastest in air .

Y also appears to be light wave as  speed of light is reduced when it passes from air to water .

Z  It is impossible to tell anything about the nature of Z wave .

Answer:

d

Explanation:

Answer:

33.3 g ≈ 33 g

Explanation:

Please see attached photo for explanation.

From the attached photo, M is the mass that we must obtain to balance the plank.

The mass, M can be obtained as follow:

Anticlockwise moment = clockwise moment

Anticlockwise moment = 50 x 20

Clockwise moment = M x 30

Anticlockwise moment = clockwise moment

50 x 20 = M x 30

Divide both side by 30

M = (50 x 20)/30

M = 33.3 g ≈ 33 g

Therefore, the mass that will balanced the plank at the 70 cm length is appropriately 33 g

Answer:

b and d

a, c, e, and f

Explanation:

Ideal gas law:

PV = nRT

Solving for temperature:

T = PV / (nR)

Therefore, temperature is directly proportional to pressure and volume, and inversely proportional to the number of molecules.

T = k PV / N

Let's say that T₀ is the temperature when P = 100 kPa, V = 4 L, and N = 6×10²³.

a) T = k PV / N = T₀

b) T = k (2P) V / N = 2T₀

c) T = k (P/2) (2V) / N = T₀

d) T = k PV / (N/2) = 2T₀

e) T = k P (V/2) / (N/2) = T₀

f) T = k (P/2) V / (N/2) = T₀

b and d have the highest temperature,

a, c, e, and f have the lowest temperature.

Answer:

( a ) : Pool B

( b ) The final equilibrium temperature will be about 38°C

Explanation:

Attachment 1 : The second pool ( pool B ) had more heat transferred to it, as you can see that it's temperature rose 10 degrees Celcius comparative to pool A, that rose by 9 degrees Celcius. Though the temperature difference is minumum, pool B did have more heat transferred to it.

Attachment 2 : So as we can see, the specific heat of iron and water is given by the units J / kg [tex]*[/tex] C. The mass of each substance is also given by kilograms, so there is no need for conversions here. The heat gained by each substance is equivalent to each other, so to determine the final temperature, consider the change in temperature in the formula q = m [tex]*[/tex] c [tex]*[/tex] Δ T.

For the iron horseshoe, the change in temperature will be as such : Δ T = [tex]T_f[/tex] - 693, where [tex]T_f[/tex] = Final Temperature. Respectively the change in temperature for the water will be Δ T = [tex]T_f[/tex] - 39, where [tex]T_f[/tex] = Final Temperature. Using this information let us solve for [tex]T_f[/tex].

q = m [tex]*[/tex] c [tex]*[/tex] Δ T - where q = heat gained, m = mass of substance, c = specific heat of substance

Δ T = [tex]T_f[/tex] - 693 and Δ T = [tex]T_f[/tex] - 39,

[tex]( 0.33 )( 448 )( T_f - 693 ) = ( 24 )( 4186 )( T_f - 39 )[/tex] - let's say [tex]T_f[/tex] = x,

[tex]\left(0.33\right)\left(448\right)\left(x-693\right)=\left(24\right)\left(4186\right)\left(x-39\right)[/tex],

[tex]147.84x-102453.12=100464x-3918096[/tex],

[tex]147.84x=100464x-3815642.88[/tex],

[tex]-100316.16x=-3815642.88[/tex],

[tex]\frac{-100316.16x}{-100316.16}=\frac{-3815642.88}{-100316.16}[/tex],

[tex]x=38.03617\dots[/tex]

The final equilibrium temperature will be about 38°C.

Answer:

[tex]\boxed{B}[/tex]

Explanation:

[tex]v=\frac{p}{m}[/tex]

[tex]v=velocity\\p=momentum\\m=mass[/tex]

[tex]v=?\\p=1000\\m=110[/tex]

[tex]v=\frac{1000}{110}[/tex]

[tex]v \approx 9.09[/tex]

Answer:

[tex]\boxed{299}[/tex]

Explanation:

In this reaction, Sum of Atomic Masses of Left side = Sum of Atomic Masses of right side

Let the atomic mass of Thorium be x

So,

233 = 4 + x

Subtracting 4 to both sides

x = 233-4

x = 229

Answer:

C :)

Explanation:

Answer: 2858.7726N

Explanation:

Given that :

Charge 1 (q1) = -0.00125 C

Charge 2 (q2) = +0.00333 C

Distance (r) = 3.62 m

According to columb's Law: The magnitude of the force between any two charged objects :

Fe = (Kq1q2) / r^2

Coloumb's constant(k) = 9×10^9 Nm^2/C^2

Fe = (9×10^9 * 0.00125 * 0.00333) / 3.62^2

Fe = (0.0000374625 * 10^9) / 13.1044

Fe = 37462.5 / 13.1044

Fe = 2858.7726N

Answer:

2858.7726 N

Explanation:

acellus

Explanation:

Take south to be negative.

a. Momentum is mass times velocity.

p = mv

p = (540 kg) (-6 m/s)

p = -3240 kg m/s

p = 3240 kg m/s south

b. Impulse = change in momentum

J = Δp

Since the mass is constant:

J = mΔv

J = (540 kg) (-4 m/s − (-6 m/s))

J = 1080 kg m/s

J = 1080 kg m/s north

Answer:

4.58×10²³ atoms

5.94×10⁻²¹ J

1340 m/s

Explanation:

Use ideal gas law to find moles of gas.

PV = nRT

(1.266 atm × 101300 Pa/atm) (4/3 π (0.15 m)³) = n (8.31451 J/mol/K) (14 + 273) K

n = 0.760 mol

Use Avogadro's number to find number of atoms.

(0.760 mol) (6.02214×10²³ atom/mol) = 4.58×10²³ atoms

Average kinetic energy per molecule is:

KE = 3/2 kT

KE = 3/2 (1.38066×10⁻²³ J/K) (14 + 273) K

KE = 5.94×10⁻²¹ J

RMS speed of each atom is:

KE = 1/2 mv²

5.94×10⁻²¹ J/atom = 1/2 (0.004 kg/mol) (1 mol / 6.02214×10²³ atom) v²

v = 1340 m/s

Answer:

1.97×10⁻²¹ J

Explanation:

Use ideal gas law to find temperature.

PV = nRT

(9 atm) (9 L) = (83.3 mol) (0.0821 L·atm/mol/K) T

T = 11.9 K

The average kinetic energy per atom is:

KE = 3/2 kT

KE = 3/2 (1.38×10⁻²³ J/K) (11.9 K)

KE = 2.46×10⁻²² J

For a mass of 5.34×10⁻²⁶ kg, the kinetic energy is:

KE = (5.34×10⁻²⁶ kg) (1 mol / 0.004 kg) (6.02×10²³ atom/mol) (2.46×10⁻²² J)

KE = 1.97×10⁻²¹ J

Answer:

A. 400 J

Explanation:

Because the process is isochoric, no volume change, so no work, so none of the energy is lost or converted. In other words, the system will gain and hold onto all of the J of heat put into it, which was 400J

Answer:

A. lord kelvin

Explanation:

In 1848, Kelvin used this as a basis for an absolute temperature scale. He defined "absolute" as the temperature at which molecules would stop moving, or "infinite cold." From absolute zero, he used the same unit as Celsius to determine the increments.

Absolute zero cannot technically be achieved. However, scientists have been able to lower the temperature of matter to just a fraction of a Kelvin above absolute zero through techniques such slowing down particles using lasers.

Answer:

Option B

Explanation:

Weight can be measured in pounds. Pounds is a unit of weight.

=> Mass is measured in kgs

=> A bowling ball has more mass than a golf ball.

=> Objects do not have the same weight regardless of where they are. The weight depends on where they are as it depends on the acceleration due to gravity (g)

Answer:

B

Explanation: