Help me with this please

Answer:

B

Explanation:

quantization of energy is only seen in atoms

Answer:

13.5 x 10^-9 A

Explanation:

Yes

Answer:

the frequency of the oscillation is 1.5 Hz

Explanation:

Given;

mass of the spring, m = 1500 kg

extention of the spring, x = 5 mm = 5 x 10⁻³ m

mass of the driver = 68 kg

The weight of the driver is calculated as;

F = mg

F = 68 x 9.8 = 666.4 N

The spring constant, k, is calculated as;

k = F/m

k = (666.4 N) / (5 x 10⁻³ m)

k = 133,280 N/m

The angular speed of the spring is calculated;

[tex]\omega = \sqrt{\frac{k}{m} } \\\\\omega = \sqrt{\frac{133280}{1500} } = 9.426 \ rad/s[/tex]

The frequency of the oscillation is calculated as;

ω = 2πf

f = ω / 2π

f = (9.426) / (2π)

f = 1.5 Hz

Therefore, the frequency of the oscillation is 1.5 Hz

Answer:

1) true 2) true 3) true 4) true 5) false 6) false

Explanation:

Answer:

The number of particles in state E0 over the number of particles in state E1  will reduce

Explanation:

E0 represents the ground level state when all the particles have same energy level.

E1 represents excited state in which only a few particle reaches

E0 and E1 get further apart  means that the energy difference between the two level increases.

Thus, the number of particles in state E0 over the number of particles in state E1  will reduce.

Answer:

r = 6.6 x 10³ m = 6600 m

Explanation:

The potential at a distance from a charged sphere can be given as follows:

[tex]V = \frac{kq}{r}\\\\r = \frac{kq}{V}[/tex]

where,

r = distance = ?

k = Colomb Constant = 9 x 10⁹ Nm²/C²

q = charge on sphere = 3.3 C

V = potential = 4.5 MV = 4.5 x 10⁶ V

Therefore,

[tex]r = \frac{(9\ x\ 10^9\ Nm^2/C^2)(3.3\ C)}{4.5\ x\ 10^6\ V}[/tex]

r = 6.6 x 10³ m = 6600 m

Answer:

the researcher say hi for us the best pa the best of us are going out to eat that I can get my money toward a little bit but the best of luck to be at work by then and we will see what the status

Answer:

The carpet has a buildup of electrons in it that get released onto your body when you rub across the floor while the hardwood doesn't have electrons built up inside of it.

Explanation:

I study that

Answer:

2 Joule

Explanation:

Work=force *dISPLACMENT

2N*1M

2 JOUL

Answer:

As objects move around over time, the energy associated with them—e.g., kinetic, gravitational potential, heat—might change forms, but if energy is conserved, then the total will remain the same. Conservation of energy applies only to isolated systems.

thenks and pls mark me barinliestt :))

Answer:

773.25 Hz

Explanation:

Concept : In an open organ pipe in fundamental mode of vibration

wave length of wave λ = 2L

where L  is length of  the pipe

frequency   = velocity of sound / λ

Given values: fundamental frequency = 288 Hz

fluid is air. velocity of sound = 340 m/s

⇒ 288 = 340/2L

⇒L = 59.02 cm

The point to be noted is if the pipe is filled with helium initially at the same temperature, there would be change in the sound velocity .Then,  frequency of note produced will also be changed .

We know that velocity of sound is inversely proportional to  square root of molar mass of gas

velocity of sound in air / velocity of sound in helium = Square root of (Molar mass of Helium/ molar mass of air)

[tex]\frac{V_a}{V_{He}} = \sqrt{\frac{4}{28.8} } \\\frac{340}{V_{He}} =0.3725\\V_{He} =912.5 m/s[/tex]

Now, frequency  = velocity of sound / λ

= 912.75 / (2 x 0.5902)

= 773.25 Hz

Answer:

Your answer is wavelength

Answer:

$ 0.077

Explanation:

We'll begin by calculating the equivalent resistance of the three 300 Ω resistors connected in series. This can be obtained as follow:

Equivalent resistance of the three 300 Ω (R₃₀₀) = 300 + 300 + 300

= 900 Ω

Next, we shall determine the equivalent resistance of the two 100 Ω resistors connected in series. This can be obtained as follow:

Equivalent resistance of the two 100 Ω (R₁₀₀) = 100 + 100

= 200 Ω

Next, we shall determine the equivalent resistance in the circuit. This can be obtained as follow:

Equivalent resistance of the three 300 Ω (R₃₀₀) = 900 Ω

Equivalent resistance of the two 100 Ω (R₁₀₀) = 200 Ω

Equivalent Resistance (R) =?

R = R₃₀₀ × R₁₀₀ / R₃₀₀ + R₁₀₀ (since they are in parallel connections)

R = 900 × 200 / 900 + 200

R = 163.64 Ω

Next, we shall determine the energy in KWh. This can be obtained as follow:

Voltage (V) = 10 V

Resistance (R) = 163.64 Ω

Time (t) for 30 days = 12 × 30 = 360 h

Energy (E) =?

E = V²t / R

E = 10² × 360 / 163.64

E = 100 × 360 / 163.64

E = 36000 / 163.64

E = 220 Wh

Divide by 1000 to express in KWh

E = 220 Wh / 1000 = 0.22 KWh

Finally, we shall determine the amount paid for 1 month (30 days). This can be obtained as follow:

Cost per KWh = $ 0.35

Energy (E) = 0.22 KWh

Cost for 30 days =?

Cost for 30 days = Energy × Cost per KWh

Cost for 30 days = 0.22 × 0.35

Cost for 30 days = $ 0.077

Therefore, the amount that must be paid for 1 month is $ 0.077

Answer:

As long as there is rain, a rainbow is possible. Rain is possible on a sunny day, and is known as a sunshower.The rainbow can be observed in a sunny day if the water droplets are present in air and the sun rays pass through it reaches the eye of the observer. In this situation, the observer can see a rainbow.

or

If you happened to look up at the sky this past weekend, you might have noticed a rare and beautiful sight: iridescent rainbow clouds, but not a drop of rain in sight. This phenomenon is known, fittingly, as cloud iridescence or irisation. The effect is not unlike seeing a rainbow painted on the clouds.

Answer:

C) the heat removed from the inside to the work done to remove the heat.

Explanation:

Refrigerator is a heat engine working in reverse direction . Heat from cold source is taken out , some work is done to remove them and total heat and work energy is thrown into outside surrounding .

If q heat is taken out and W is work done to get this heat out .

coefficient of performance ( COP ) = q / W .

Hence C ) is the right choice .

Answer:

• specific heat

1 Answer. The specific heat is the amount of heat required to raise the temperature of 1 g of substance by one degree Celsius or one Kelvin

Answer:

The angle the boat must be pointed upstream is 69⁰

Explanation:

Check the image uploaded for the diagram;

Given;

speed of the boat on still water, = 4.6 km/h

speed of the boat on a river with current, = 1.8 km/h

The angle the boat must be pointed upstream is calculated as follows

[tex]tan(\theta) = \frac{4.6}{1.8} \\\\tan(\theta) = 2.556\\\\\theta = tan^{-1}(2.556)\\\\\theta = 68.63^0\\\\\theta = 69^0[/tex]

Answer:

B

Explanation:

Answer:

D)parallel circuit

Explanation:

the components are placed parallel from eachother

This question is incomplete, the complete question is;

A woman is 160cm tall. What is the minimum vertical length of a mirror in which she can see her entire body while standing upright.

Hint: Consider the ray diagram below, of the rays that enable her to see her feet and the top of her head.

Use what you know about the law of reflection, together with a bit geometry.

The missing Image is uploaded along this answer below.

Answer:

the minimum vertical length of a mirror in which she can see her entire body while standing upright is 80 cm

Explanation:

Given the data in the question and illustrated in the image below,

From image 2;

The distance from the woman's eyes to the top of her head is represented as b and a represent the distance from her eyes to her feet.

Therefore, since her height is 160 cm

a + b = 160 ------ let this be equation 1

i.e AD + DG = 160 cm

Now, from the same image 2, we will notice that triangle ABC and tringle CBD are similar, so

∠ABC = ∠CBD

AC = CD

since AD = a and AC + CD = A

AC = CD = a/2

Also, triangle DEF and FEG are si,ilar

∠DEF = ∠FEG

so

DF = FG

since DG = b and DF + FG = b

DF = b/2

so the minimum vertical length of a mirror in which the woman can see her entire body while standing upright will be;

⇒ a/2 + b/2  

⇒ a + b / 2

from equation 1, a + b = 160

so

⇒ a + b / 2 = 160 / 2 = 80

Therefore, the minimum vertical length of a mirror in which she can see her entire body while standing upright is 80 cm

The minimum vertical length of a mirror in which she can see her entire body while standing upright is 80 cm.

The minimum vertical length of a mirror in which she can see her entire body while standing upright is calculated as follows;

u + v = 160 cm

where;

For mirror, u = v

2u = 160 cm

u = 160 cm/2

u = 80 cm

Learn more about image height here: https://brainly.com/question/10501143

#SPJ5

Answer:

8 days

Explanation:

Answer:

Condensation is the process by which water vapor in the air is changed into liquid water. Condensation is crucial to the water cycle because it is responsible for the formation of clouds.

Explanation:

just is

Answer:

2.6x10^{10}

Explanation:

please do follow me

Answer:

Option B is appropriate for this question

Answer:

[tex]\epsilon_2=0.098[/tex]

Explanation:

Diameter [tex]d=30cm=0.3m[/tex]

Temperature [tex]T=600k[/tex]

Rate of supply [tex]r=65W[/tex]

Emissivity of base surface [tex]\in_b =0.55[/tex]

Temperature at base [tex]T_b=400k[/tex]

Generally the equation for Area of base surface is mathematically given by

 [tex]A_b=\frac{\pi}{4}d^2[/tex]

 [tex]A_b=\frac{\pi}{4}0.3^2[/tex]

 [tex]A_b=0.0707m^2[/tex]

Generally the equation for Area of Hemispherical dome is mathematically given by

 [tex]A_h=\frac{\pi}{2}d^2[/tex]

 [tex]A_h=\frac{\pi}{2}0.3^2[/tex]

 [tex]A_h=0.1414m^2[/tex]

Since base is a flat surface

 [tex]F_{11}+F_{12}=1[/tex]

 [tex]F_{11}=0[/tex]

Therefore

 [tex]F_{12}=1[/tex]

 [tex]A_b=0.0707m^2[/tex]

Generally the equation for Net rate of radiation heat transfer between two surfaces is mathematically given by

 [tex]Q_{21}=-Q_{12}[/tex]

 [tex]Q_{21}=\frac{\sigma(T_1^4-T_2^4)}{\frac{1-\epsilon}{A_b\epsilon_1} +\frac{1}{A_bF_{12}} +\frac{1-\epsilon_2}{A_h*\epsilon_2} }[/tex]

Where

 [tex]\sigma=5.67*10^{-8}[/tex]

Therefore

  [tex]65=\frac{(5.67*10^{-8}(400^4-600^4))}{\frac{1-0.55}{0.0707*0.55}+\frac{1}{0.0707}+\frac{1-\epsilon_2}{0.1414*\epsilon_2}}[/tex]

 [tex]\epsilon_2=0.098[/tex]

 [tex]\epsilon_2 \approx 0.1[/tex]

Therefore  the emissivity of the dome is

 [tex]\epsilon_2=0.098[/tex]

Answer:B

Explanation:

Answer: [tex]8.54\times 10^{-5}\ s[/tex]

Explanation:

Given

The initial magnetic field is [tex]B=0.27\ T[/tex]

No of turns [tex]N=599\ \text{turns}[/tex]

Diameter of the solenoid [tex]d=9.29\ cm[/tex]

Induced EMF [tex]E=12.8\ kV[/tex]

Induced emf is the product of no of turns and rate of change of flux.

[tex]\Rightarrow E=-N\cdot \dfrac{\Delta \phi }{\Delta t}\\\\\Rightarrow E=-N\cdot \dfrac{\Delta (B\cdot A)}{\Delta t}\\\\\Rightarrow E=-NA\cdot \dfrac{\Delta B}{\Delta t}\\\\\text{Insert the values}\\\\\Rightarrow 12.8=-599\times \pi r^2\cdot \dfrac{(0-B)}{\Delta t}\\\\\Rightarrow \Delta t=\dfrac{599\times \pi \times (4.64\times 10^{-2})\times 0.27}{12.8\times 10^3} \\\\\Rightarrow \Delta t=854.71\times 10^{-7}\ s\\\\\text{Taking absolute value}\\\Rightarrow \Delta t=8.54\times 10^{-5}\ s[/tex]