take 50 points please help me these two questions ​

Answer:the radius of fifth Bohr orbital of hydrogen is 1.3225x10^-9

Explanation:

Let's see

According to bohrs model

[tex]\\ \rm\Rrightarrow r\propto n^2/Z^2[/tex]

[tex]\\ \rm\Rrightarrow r= r_on^2/Z^2[/tex]

[tex]\\ \rm\Rrightarrow r=0.529\times \dfrac{5^2}{1^2}[/tex]

[tex]\\ \rm\Rrightarrow r=0.529(25)[/tex]

[tex]\\ \rm\Rrightarrow r=1.32nm[/tex]

Answer:

I believe your looking at either 1 or 2

Explanation:

Answer:

The answer is t=4 + t=3=t=7

Answer:

411.37 meters

Explanation:

car position = 60 + 30 t

cop position = 1/2 a t^2 =   3 t^2     equate them

30t + 60 = 3t^2      re-arrange

3t^2 - 30t - 60 = 0    use quadratic formula to find t = 11.71 sec

1/2 (6)(11.71)^2 = 411.37 meters

The New Mexico Institute of Mining and Technology is significant because it proffer solutions to future challenges and problems.

The New Mexico Institute of Mining and Technology is also known as New Mexico Tech and it refers to a public university that is located in Socorro, New Mexico.

Basically, the New Mexico Institute of Mining and Technology is a public university which is devoted to excellence in education, innovation and research, so as to advance engineering, science, and technology.

In conclusion, the New Mexico Institute of Mining and Technology is significant because it proffer solutions to future challenges and problems.

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Answer:

15,000 J of potential energy

Explanation:

Mechanical energy of an object is the sum of its potential energy and kinetic energy.

45,000  = x + 30,000

45,000 - 30,000 = x

x = 15,000

Mark brainliest please!

ME=KE+PE

45000=30000+PE

PE=15000 J

Answer:

Agree

Explanation:

Regarding the aluminium foil, its actually a transparent material, allowing almost all light to pass through. Non-visible light, such as radio waves, x-rays, and gamma-energy photons, can most definitely can travel through wood too. So yeah agree.

Light can travel through transparent materials which we  can see through.  Materials like, wood, aluminums foil etc. are opaque to light and does not pass light through it. Hence, disagreeing to the statement.

A material is said to be transparent if light can pass through it. Thus light any of the phenomenon like transmission, absorption or reflection. A fraction of light transmitting through the material is absorbed by it.

Mirror, glass, water etc. are transparent and light can transmit through it. These materials can absorb light and reflect a portion. The amount of incident light that is absorbed by the material is dependent on its nature.

Objects that does not pass light through them are called opaque. They cant absorb or reflect light. Objects such as wood, aluminum foil, metals such  as iron etc. are opaque. Thus, the given statement is false.

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Answer:

Postpartum depression is very common

Explanation:

Common for ages 18-35

Postpartum depression: A mood disorder or depression that occurs in mothers after the birth of a baby. Usually this will be a short term disorder.

Postpartum depression is very common. The correct option is B.

Following childbirth, postpartum depression (PPD) is the most prevalent psychological disorder.

Postpartum depression (PPD) can affect one in seven women. The "baby blues" are a common postpartum condition for new mothers.

It is crucial to understand that postpartum depression is a serious problem that can have a substantial influence on mothers' and families' wellbeing.

In order to address and manage postpartum depression, it is essential to seek treatment and support from healthcare professionals.

Thus, the correct option is B.

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Your question seems incomplete, the probable complete question is:

Which of the following statements about postpartum depression is TRUE? A. Most cases of postpartum depression must be treated medically.

B. Postpartum depression is very common.

C. Postpartum depression is related to breastfeeding.

D. Most women can work through severe postpartum depression on their own.

Answer:

the sympathetic nervous system

Explanation:

It triggers the fight-or-flight response.

Answer:

These cool down not only the house but even helps with the potential of canceling the heating effect of up to two years of worldwide carbon dioxide emissions. Which would over help the co2 rates.

Answer:

solution here

The correct anwer isB .

Answer:

The first one. Kinetic to Electric

Explanation:

The wire is spinning which is Kinetic energy, and the energy is being transferred into electric.

Answer:

Due to its centre of mass being too high and because of that it is at a high risk of toppling at the corner

Answer:

64 412 .88 N

Explanation:

F = ma

  = 3864 kg * 16.67 m/s^2 = 64412.88 N

Answer:

h = distance up = 50 sin 10

m g h = 800 * 9.81 * 50 sin 10 Joules

Explanation:

Answer:

Approximately [tex]0.253\; {\rm J \cdot g^{-1} \cdot K^{-1}}[/tex] assuming no heat exchange between the mixture and the surroundings.

Explanation:

Consider an object of specific heat capacity [tex]c[/tex] and mass [tex]m[/tex]. Increasing the temperature of this object by [tex]\Delta T[/tex] would require [tex]Q = c\, m \, \Delta T[/tex].

Look up the specific heat of water: [tex]c(\text{water}) = 4.182\; {\rm J \cdot g^{-1} \cdot K^{-1}}[/tex].

It is given that the mass of the water in this mixture is [tex]m(\text{water}) = 1.00 \times 10^{2}\; {\rm g}[/tex].

Temperature change of the water: [tex]\Delta T(\text{water}) = (45 - 35)\; {\rm K} = 10\; {\rm K}[/tex].

Thus, the water in this mixture would have absorbed :

[tex]\begin{aligned}Q &= c\, m\, \Delta T \\ &= 4.182\; {\rm J \cdot g^{-1}\cdot K^{-1}} \\ &\quad \times 1.00 \times 10^{2}\; {\rm g} \times 10\; {\rm K} \\ &= 4.182 \times 10^{3}\; {\rm J}\end{aligned}[/tex].

Thus, the energy that water absorbed was: [tex]Q(\text{water}) = 4.182 \times 10^{3}\; {\rm J}[/tex].

Assuming that there was no heat exchange between the mixture and its surroundings. The energy that the water in this mixture absorbed, [tex]Q(\text{water})[/tex], would be the opposite of the energy that the metal in this mixture released.

Thus: [tex]Q(\text{metal}) = -Q(\text{water}) = -4.182 \times 10^{3}\; {\rm J}[/tex] (negative because the metal in this mixture released energy rather than absorbing energy.)

Mass of the metal in this mixture: [tex]m(\text{metal}) = 3 \times 1.00 \times 10^{2}\; {\rm g} = 3.00 \times 10^{2}\; {\rm g}[/tex].

Temperature change of the metal in this mixture: [tex]\Delta T(\text{metal}) = (100 - 45)\; {\rm K} = 55\; {\rm K}[/tex].

Rearrange the equation [tex]Q = c\, m \, \Delta T[/tex] to obtain an expression for the specific heat capacity: [tex]c = Q / (m\, \Delta T)[/tex]. The (average) specific heat capacity of the metal pieces in this mixture would be:

[tex]\begin{aligned}c &= \frac{Q}{m\, \Delta T} \\ &= \frac{-4.182 \times 10^{3}\; {\rm J}}{3.00 \times 10^{2}\; {\rm g} \times (-55\; {\rm K})} \\ &\approx 0.253\; {\rm J \cdot g^{-1} \cdot K^{-1}}\end{aligned}[/tex].

Answer:

Speed of Sound = 2D

Time

Where D is the depth of water

2D = Speed × Time

2D = 1450m/s × 0.6s

D = 1450m/s × 0.6s

D

Depth D = 870m

The kinetic energy of the cell phone before it hits the ground given the data is 9 J

The kinetic energy of the cell phone can be obtained as follow

KE = ½mv²

KE = ½ × 0.08 × 15²

KE = 0.04 × 225

KE = 9 J

Thus, the kinetic energy of the cell phone is 9 J

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The kinetic energy right before it hits the ground is 0.6 J

Kinetic energy is the energy possessed by a body in motion. The S.I unit is Joule. Kinetic energy depends on:

Given that a 0.08 kg cell phone falls off a table at 15 m/s, its

kinetic energy right before it hits the ground can be calculated by using the formula;

K.E = 1/2 x m x [tex]v^{2}[/tex]

The given parameters are:

mass m = 0.08 kg

velocity v = 15 m/s

Substitute the parameters into the formula

K.E = 1/2 x 0.08 x 15

K.E = 0.6 J

Therefore, its kinetic energy right before it hits the ground is 0.6 J

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Answer:

A are the ovaries and B are the testes

Taking into account the Newton's second law, the gravitational force acting on a falling object is calculated by multiplying mass and acceleration due to gravity (third option).

In first place, acceleration in a body occurs when a force acts on a body. There are two factors that influence the acceleration of an object: the net force acting on it and the mass of the body.

Newton's second law states that this force will change the speed of an object because the speed and / or direction will change. These changes in velocity are called acceleration.

So, Newton's second law defines the relationship between force and acceleration mathematically. This law says that the acceleration of an object is directly proportional to the sum of all the forces acting on it and inversely proportional to the mass of the object.

Mathematically, Newton's second law is expressed as:

F= m×a

where:

In this case, the only force is gravity. Then, the gravitational force acting on a falling object is calculated by multiplying mass and acceleration due to gravity (third option).

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Answer:

Option B

Explanation:

Option A is the wrong answer because the horizontal vector is in the opposite direction.

Option C is the wrong answer as the horizontal vector is in the opposite direction and all the vectors are connected head to tail [of the arrows] [Triangle law of vector addition]

Option D is the wrong answer as the horizontal vector is in the opposite direction.

The final velocity of the two objects after the collision is determined as 4 m/s.

The final velocity of the two objects after the collision is determined from the principle of conservation of linear momentum as shown below;

m₁u₁ + m₂u₂ = v(m₁ + m₂)

where;

2(5) + 0.5(0) = v(2 + 0.5)

10 = 2.5v

v = 10/2.5

v = 4 m/s

The complete question is below:

A body of mass 2kg moving with velocity of 5m/s collides with a stationary body of mas 500g. if the two bodies move together after impact. Calculate the magnitude of their common velocity.

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This question involves the concepts of the resolution of vector and rectangular components.

The vertical and horizontal components of velocity are "21.65 m/s" and "12.5 m/s", respectively.

The resolution of a vector into its rectangular components gives two components of the vector in the horizontal and the vertical directions. These components can be mathematically found as follows:

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

where,

Therefore,

[tex]v_x = (25\ m/s)Cos (30^o)\\v_x = 21.65\ m/s[/tex]

For vertical component:

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

where,

Therefore,

[tex]v_y = (25\ m/s)Sin (30^o)\\v_y = 12.5\ m/s[/tex]

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Answer:

N1 Sin θ1 = N2 Sin θ2        Snell's Law

For blue light

Sin θ2 = N1 / N2 sin 35.8 = 2.444 / 1.531 * .5850 = .9339

θ2 = 69.04 deg

For red light

Sin θ2 = 2.410 /1.520 * .5850 = .9275

θ2 = 68.05 deg

The separation is .01 deg

Answer:

（3x - 4）（x - 1）

Explanation:

Your question is wrong

Answer:

1/i + 1/o = 1/f     thin lens equation

i = 33 * 8.9 / (33 - 8.9) = 12.2 cm  to right of first lens

27 - 12.2 = 14.8 cm to left of second lens

i = 14.8 * 8.9 / (14.8 - 8.9) = 22,3 cm to right of second lens

Answer:

Have the same speed.

Explanation:

All electromagnetic waves travel at the same speed, which is 300,000,000 m/s.

The factors influencing the rate of chemical reaction are concentration of the reactant,Surface area and physical condition of the reactants, Temperature, and catalyst.

One or more compounds, known as reactants, are transformed into one or more distinct substances, known as products. Such a process is known as a chemical reaction.

Following are the factors Influencing the rate of chemical reaction;

1. Concentration of the reactant.

The reaction is usually accelerated by increasing the concentration of one or more reactants. This occurs because a higher concentration of a reactant results in more collisions with that reactant in the same amount of time.

2. Surface area and physical condition of the reactants.

The pace of reaction is limited by the surface area of the in contact phases if reactant molecules reside in different phases, as in a heterogeneous mixture.

3. Temperature.

The rate of reaction is typically accelerated as the temperature rises. As the temperature rises, the average kinetic energy of the reactant molecules increases.

4. Catalyst

A catalyst is a substance that aids in the process without being ingested.

Catalysts provide a second reaction pathway for the production of goods. They play a crucial function in a variety of biological processes.

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Answer:

(a)

Q=mgh

20=108×9.81×h

20=1059.48h

divide both side by 1059.48

h= 20/1059.48

h=0.02

(b)

1050= 108×9.81×h

1050= 1059.48h

h=1050/1059.48

divide both side by 1059.48

h=0.99

repeat the remaining following and check the answers

(c) h=0.14

(d) h=0.11

(e) h=1.89

(f) h= 0.05

(g) h=1.13

(h) h=0.94

(i) h= 86.84

note the (h) and (i) you need to change the kj to j by multiple by 1000