30.6*X+-2.56
Pls help

Answer:

C. 10⁻³ rads

Explanation:

Here, we shall use Rayleigh's Criterion to find out the angular resolution of Cat's eye during day light. Rayleigh's Criterion is written as follows:

θ = λ/a

where,

θ = angular resolution of Cat's eye = ?

λ = wavelength = 500 nm = 5 x 10⁻⁷ m

a = slit width of eye = 0.5 mm = 5 x 10⁻⁴ m

Therefore,

θ = (5 x 10⁻⁷ m/5 x 10⁻⁴ m)

Therefore,

θ = 0.001

θ = Sin⁻¹(0.001)

θ = 0.001 rad = 1 x 10⁻³ rad

Hence, the correct answer is:

C. 10⁻³ rads

Answer: A. -0.1 m/s

Explanation:

Answer:

The Answer is the first one, A. Or -0.1 m/s.

Explanation:

Answer:

Explanation:

Distance of barrier = 40 m

Distance covered during reaction time = .75 x 40 = 30 m .

distance covered during deceleration can be calculated as follows .

v² = u² - 2 a s

0 = 40² - 2 x 10 x s

s = 80 m

Total distance covered before coming to rest = 30 + 80 = 110 m

Distance of barrier = 40 m , so it will hit the barrier .

Answer:

Explanation:

potential energy of water is converted into heat energy

P E = mgh = m x 9.8 x 111

= 1087.8 m .

Let rise in temperature θ

m x s x θ = heat absorbed

m x s x θ =  1087.8 m

m x 4182 x θ =  1087.8 m

θ = 0.26 degree celsius .

Answer:

T = 104.2 N

Explanation:

For this exercise we must define a coordinate system, the x axis is horizontal and the y axis is vertical, let's write the equilibrium equations on each axis

X axis

         T₁ₓ-T₂ₓ = 0

         T₁ₓ = T₂ₓ                           (1)

y axis  

         [tex]T_{1y}[/tex] + T_{2y} - W = 0

          T_{1y} + T_{21y} = W      (2)

Let's use trigonometry to find the decomposition of the stresses, they indicate that the angle between the two forces is 140º, but each force has an angle of 70º

           cos 70 = T₁ₓ / T₁

           T₁ₓ = T₁ cos 70

           sin 70 = [tex]T_{1y}[/tex] / T₁

           T_{1y} = T₁ sin 70

for tension 2 we have a similar equation

            T₂ₓ = T₂ cos 70

             T_{2y} = T₂ sin 70

From equation 1

        T₁ cos 70 = T₂ cos 70

        T₁ = T₂

therefore the two children apply the same force

From equation 2

        T sin 70 + T sin 70 = W

        2 T sin 70 = W

        T = W / 2sin 70

        T = 196 / (2 sin 70)

        T = 104.2 N

the two children have the same strength

Answer:

The balanced condition for Wheatstones bridge is  

Q

P

​  

=  

S

R

​  

as is obvious from the given values.

No, current flows through galvanometer is zero.

Now, P and R are in series, so

Resistance,R  

1

​  

=P+R

=10+15=25Ω

Similarly, Q and S are in series, so

Resistance R  

2

​  

=R+S

=20+30=50Ω

Net resistance of the network as R  

1

​  

 and R  

2

​  

 are in parallel

i=  

R

V

​  

=  

50

6×3

​  

=0.36 A.

Explanation:

Answer:

The correct option is A

Explanation:

For a substance to boil at 1415 °C shows the substance is an electrovalent/ionic substance (hence the elements are not the answer). Electrovalent/ionic substances are characterized by high melting and boiling points. Also, with a density of 3.13 g/cm³ (with a +/- 0.1 g/cm³), the correct answer is potassium iodide. This is because potassium iodide has a density of 3.12 g/cm³ (which is - 0.1 g/cm³). It should also be noted that pure potassium iodide boils at 1,330 °C, however the presence of impurities could increase the boiling point of the salt, thus an impure potassium iodide could have a density of 3.12 g/cm³ and a temperature around 1415 °C

"Potassium iodide" would it most likely be. A further explanation is provided below.

Given values are:

Density,

Boiling point,

Density can be change by,

Uncertainty in temperature,

We can take the value of density from:

We can take the value of temperature from:

After checking the ranges, we find "Potassium iodide" have density as well as temperature in our range.

Thus the above answer is right.

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Answer:

ΔV = 2.04 x 10⁻⁶ m³ = 2.04 cm³

Explanation:

First we will find the initial volume of mercury by subtracting the volume of the steel ball from the interior volume of the brass shell:

V = Vs - Vb

where,

V = Initial Volume of Mercury  = ?

Vb = Volume of brass shell = 1.26 x 10⁻³ m³

Vs = Volume of Steel Ball = 0.63  x 10⁻³ m³

Therefore,

V = (1.26 x 10⁻³ m³) - (0.63 x 10⁻³ m³)

V = 0.63 x 10⁻³ m³

Now, we find the change in volume of mercury that will spill out due to increase in temperature:

ΔV = βVΔT

where,

ΔV = Amount of Mercury Spilled out = ?

β = Coefficient of Volumetric Expansion of mercury = 1.8 x 10⁻⁴ °C⁻¹

ΔT = Increase in temperature = 18 °C

Therefore,

ΔV = (1.8 x 10⁻⁴ °C⁻¹)(0.63 x 10⁻³ m³)(18 °C)

ΔV = 2.04 x 10⁻⁶ m³ = 2.04 cm³

The volume of mercury that spills out due to increase in temperature is [tex]2.04 \times 10^{-6} \ m^3[/tex].

The given parameters;

The volume of mercury in the given shell is calculated as;

[tex]V= V_1 - V_2\\\\V= 1.26 \times 10^{-3} \ - \ 0.63 \times 10^{-3} \\\\V = 6.3 \times 10^{-4} \ m^3[/tex]

The change in the volume of the mercury is calculated as follows;

[tex]\Delta V = \beta V \Delta t\\\\[/tex]

where;

[tex]\Delta V = (1.8 \times 10^{-4} ) \times (6.3\times 10^{-4}) \times 18\\\\\Delta V = 2.04 \times 10^{-6} \ m^3[/tex]

Thus, the volume of mercury that spills out due to increase in temperature is [tex]2.04 \times 10^{-6} \ m^3[/tex].

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Answer: deposition

Explanation:

Try process of elimination. We know it's not boiling because that is basically water turning into gas. It's not condensation because it's not water which collects as droplets on a cold surface when humid air is in contact with it.

Answer:

deposition

Explanation:

Answer:

A: Linear

Explanation:

Formula for Resistance of a metallic conductor is given as;

R = R_o(1 + αΔT)

Where;

R_o is the original resistance

R is the final resistance after change in temperature

ΔT is change in temperature

α is coefficient of linear expansion

Now, from the formula given, we can see that the change in resistance is directly proportional to the change in temperature.

Thus, the higher the final temperature, the more the change in resistance and the lower the final temperature, the lesser the change in resistance.

Thus, for temperature less than zero, since the change is resistance is directly proportional to the temperature, it means it follows a linear relationship.

Answer:

Put some melted plastic over the print and let it harden

Explanation:

I think that's how the police do it

Answer:

The value is  [tex]C = 30729\ c[/tex]

Explanation:

From the question we are told that

  The power rating of the stove is  [tex]P = 4.4 KW = 4.4 *10^{3} \ W[/tex]

   The duration of its use everyday is [tex]t_1 = 70 \ minutes = 1.167 \ hours[/tex]    

    The rating of the light bulbs is [tex]P_2' = 150 W[/tex]

   The number is [tex]n = 7[/tex]

   The power rating of the total  bulb is  [tex]P_2 = 7 * 150 = 1050 \ W[/tex]

    The duration of its use everyday is  [tex]t_2 = 7 hours[/tex]

    The power rating of miscellaneous appliance [tex]P_3 = 1.8 \ KW = 1.8 *10^{3} \ W[/tex]

    The duration of its use everyday is [tex]t_3 = 1 hour[/tex]

     The power rating of hot water [tex]P = 4 KW = 4 *10^{3} \ W[/tex]

      The duration of its use everyday is [tex]t_4 = 120 \ minutes = 2 hours[/tex]

Generally the total electrical energy used in 1 month is mathematically represented as

    [tex]E = P_1 * t_1 * 30 + P_2 * t_2 * 30 + P_3 * t_3 * 30+ P_4 * t_4 * 30[/tex]

=>  [tex]E = 4.4*10^{3} * 1.167 * 30 + 1050 * 7 * 30 + 1.8 *1 * 30+ 4*10^{3} * 2 * 30[/tex]

=>  [tex]E = 614598 \ W \cdot h[/tex]

=>   [tex]E = 614.6 \ K W \cdot h[/tex]

Generally the monthly electricity  bill is mathematically represented as

    [tex]C = 614.6 * 50[/tex]

=> [tex]C = 30729\ c[/tex]

This question is incomplete, the complete question is;

Unpolarized light passes through two Polaroid sheets. The transmission axis of the second polarizing filter makes an angle of 34° with the axis of the first polarizer. What fraction of the original unpolarized light is transmitted through the second polarizing filter?

Answer: the fraction of the original unpolarized light transmitted through the second polarizing filter is 0.343

Explanation:

We know that when Unpolarized light passes through first polarizer, it's intensity will be reduced to half  i.e

I1 = I0/2

Now after that when light passes through 2nd polarizer, Intensity will be;

I2 = I1 × (cos A1)²  

but  I1 = I0/2

so

I2 = (I0/2) × (cos A1)²

I2/I0 = 0.5 × (cos A1)²

In the question we were given that; The transmission axis of the second polarizing filter makes an angle of 34° with the axis of the first polarizer

so A = 34°

so we substitute

I2/I0 = 0.5 × (cos 34)²

I2/I0 = 0.343

Therefore the fraction of the original unpolarized light transmitted through the second polarizing filter is 0.343

Answer:

I = - 0.135 kg m/s

Explanation:

The formula to calculate the impulse of delivered to the ball is:

I = Ft

where,

I = Impulse delivered to the ball by hole = ?

F = Force = ma (By Newton's Second Law)

t = time

Therefore,

I = mat

where,

m = mass of ball = 0.05 kg

a = acceleration of ball = (Vf - Vi)/t

Therefore,

I = m[(Vf - Vi)/t]t

I = m(Vf - Vi)

where,

Vf = Final velocity = - 1.3 m/s

Vi = Initial Velocity = 1.4 m/s

Therefore,

I = (0.05 kg)(- 1.3 m/s - 1.4 m/s)

I = - 0.135 kg m/s

Answer:

interphase

Explanation:

Answer:

D

Explanation:

The gravitational pull of the planet it orbits holds a moon in its orbit.

Answer: D) All of the above

Explanation:

Answer:D) 7.0 A

Explanation:

The magnetic field strength at the center of a circular loop  is calculated using the formulae

B = μ₀I / 2R

where B = ,magnetic field strength= 1.1mT = 1.1 X 10^-3T

μ₀=  magnetic constant or the permeability of free space=4π X 10^-7 H/m

R = radius = 4.0mm =4.0 x 10^-3m

I= Current = ?

B=μ₀I / 2R

I = B2R /μ₀

I =   1.1 X 10^-3T X 2 X 4.0 x 10^-3m / 4π X 10^-7 H/m

I =7.00 A

Therefore magnitude of the current that flows through the wire is 7.0 A

Answer:

a the balloon becomes negatively charged

When a charge balloon brought closer to the wall, they will repel each other. Option C is correct.

Electric Charge:

It shows the degree at which the atom or object has less or more electron than proton.

An atom with extra electrons than proton has negative charge while atoms will less electron than proton has positive charge.

Opposite charge always attracts while similar charges repel each other. Since both wall and balloon are negatively charged.

Therefore, when a charge balloon brought closer to the wall, they will repel each other.

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Answer:

As already mentioned, the mechanical energy of an object can be the result of its motion (i.e., kinetic energy) and/or the result of its stored energy of position (i.e., potential energy). The total amount of mechanical energy is merely the sum of the potential energy and the kinetic energy.

Explanation:

Answer:

Different organelles play different roles in the cell — for instance, mitochondria generate energy from food molecules; lysosomes break down and recycle organelles and macromolecules; and the endoplasmic reticulum helps build membranes and transport proteins throughout the cell.

Explanation:

Hopefully this helped!

Answer:

B???

Explanation:

guess

The shortest distance that the student could travel between home and school is approximately 539 meters.

Hence Option C) 539m is the correct answer.

Given the data in the question;

As illustrated in the image below,

We get a right angled triangle and the hypotonus "c" is the shortest distance from the student's house to her school.

Now, using  Pythagorean theorem:

[tex]a^2 + b^2 = c2[/tex]

We substitute our values into the expression and solve for "c"

[tex](500m)^2 + (200m)^2 = c^2\\\\250000m^2 + 40000m^2 = c^2\\\\c^2 = 290000m^2\\\\c = \sqrt{290000m^2}\\\\c = 539 m[/tex]

The shortest distance that the student could travel between home and school is approximately 539 meters.

Hence Option C) 539m is the correct answer.

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Answer:

The correct answer is:

a) remain where it is released

Explanation:

The concept of density seeks to measure the weight of an object in relation to its size. It is the measure of how packed together the particles of that object are. An object placed in a liquid displaces a certain volume of the liquid, based on the relative density of the object and the liquid.

If an object is less dense than a liquid in which it is placed, it displaces a smaller volume of the liquid than its volume, hence only some part of the object will be seen to be under the liquid, the other part will float.

If an object is denser than the liquid in which it is placed, it displaces a larger volume of the liquid than its own volume, making the object to sink and is submerged, sometimes to the bottom of the liquid, but mostly below the point at which it was released.

Finally, if the density of an object and the liquid into which it is submerged is the same. the object's mass per unit volume is the same as the liquid's mass per unit volume, hence the weight and force created due to density will balance and cancel each other out hence making the object to remain where it was submerged.

Answer: Debbie exerts applied force on the first cart.

Explanation:

The first cart exert applied force on the second cart.

Answer:

dx = 2000 [m]

Explanation:

To solve this problem we must use the following equation of kinematics.

[tex]dx =v_{o}*t +\frac{1}{2} *a*t^{2}[/tex]

where:

dx =  distance [m]

Vo = initial velocity = 100 [m/s]

a = acceleration = 20 [m/s²]

t = time = 10 [s]

dx = 100*10 + 0.5*20*10²

dx = 2000 [m]

Note: the positive sign in the above equation means that the car is increasing its velocity.

Answer:

Its momentum is multiplied by a factor of 1.25

Explanation:

First, we calculate the initial velocity of the object:

With that velocity we can calculate the initial momentum of the object:

Then we calculate the velocity of the object once its kinetic energy has increased:

And calculate the second momentum of the object:

Finally we calculate the factor:

RLLY?

Explanation:

ALSO

MY DAD ALWAYS TELLS ME THAT IF YOUR FEET ARE COLD THAT YOU NEED TO PUT A HAT ON?!?!?!?!?!

Answer:

the answer is b

Explanation:

An expression for the displacement as a function of time is x(t) = a sin wt.

Displacement is defined as the change in position of an object. It is a vector quantity and has a direction and magnitude. The spacing between two specified points is represented by displacement, a one-dimensional measure commonly known as length or distance.

Given in the question we have to find the displacement of the as function of time

The equation used of express displacement is.

d = V i t + 1 2 a t 2  

Displacement = Final position – initial position = change in position.

so, x = A sin wt is equation where A is amplitude and t is time period.

An expression for the displacement as a function of time is x(t) = a sin wt.

Thus, an expression for the displacement as a function of time is x(t) = a sin wt.

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