What are the two factors responsible for an object to be seen

Answer:

the correct answer is e

Explanation:

In projectile launching, the range or distance on the x-axis is given by the expression

         R = [tex]\frac{v_o^2 \ sin 2 \theta }{g}[/tex]

where v₀ is the initial velocity θ the launch angle.

When analyzing this expression is maximum when the sine function is maximum

           sin 2 θ = 1

           2θ = sin⁻¹  1

          2 θ = 90

           θ = 90/2

           θ = 45º

reviewing the answers there are no correct ones since the maximum angle occurs for 45º

if we analyze with these angles we have

θ = 40

            sin 2θ = sin 2 40 = 0.98

θ = 35

             sin 2 35 = 0.939

θ = 43

             sin 2 43 = 0.998

θ = 48

             sin 2 48 = 0.994

if we take the written angles the range is maximum for 43º

therefore the correct answer is e

Answer:

I'm not sure but, this video's pretty cool: gestyy.com/eyRkH2

Explanation:

pretty scary gameplay

Answer:

After five monthly payments, Quiana’s loan amount changes by $1,237.15.

Explanation:

Answer:

0 degrees

Explanation:

this is because when the light ray hits a surface a medium at 90 degrees then the angle of incidence = 0 , thus light doesn't bend when it enters the medium, no bending means angle of refraction is 0 degrees

hope this helps ,please mark it

Answer:

The increase internal energy is 1,760.41[tex]\overline 6[/tex] J

Explanation:

The given parameters of the worker, sledgehammer, and rail line are;

The mass of the spike driven into the rail, m₁ = 0.500 kg

The mass of the sledgehammer, m₂ = 2.50 kg

The speed of the sledgehammer, v = 65.0 m/s

The fraction of the hammers kinetic energy, KE, converted to the internal energy of the hammer and the spike, Δ[tex]E_{internal}[/tex] = 1/3 × KE

Therefore, we have;

The kinetic energy, KE, of the sledgehammer is given by KE = 1/2·m₂·v²

Where;

m₂ = The mass of the sledge hammer = 65.0 m/s

v = The velocity o the sledgehammer

∴ KE = 1/2 × 2.50 kg × (65.0 m/s)² = 5,281.25 J

Therefore;

The increase internal energy, Δ[tex]E_{internal}[/tex] = 1/3 × 5,281.25 J = 1760.41[tex]\overline 6[/tex] J

Explanation:

Solids have a definite shape and definite volume.

Answer:

Solids have a definite shape and volume because the particles in them are held together tightly.

Explanation:

Liquids have a definite volume but their particles aren't held together as tightly as solids, so liquids take on the shape of the container they are in. Gases have no definite shape OR volume they just float around because the particles in them are so loose they can take on the shape and volume of any container.

Answer:

The other child must sit the same meters as the N child so they an be balanced.

Explanation:

Answer:

Explanation:

300m/s2

Answer:

Its a wave

Explanation:

THis is one

Answer: a light wave

Explanation: a pex

Explanation:

its means the quantity in question is a scalar quantity, has only magnitude but no direction, for example. speed,has no reference to direction of motion, since the speed of a body say 5 m/s( the direction of the body has not been stated) but the velocity of a body say 5m/s to the east has a reference to direction of the motion.

That's why velocity is different from speed

Answer:

Force = 3.204Newton

Explanation:

Given the following data;

Pressure = 178

Area = 18 mm² to meter = 18/1000 = 0.018 m²

To find the force;

Force = pressure * area

Force = 178 * 0.018

Force = 3.204 Newton.

Answer:

Hey mate.....

Explanation:

This is ur answer.....

A voltmeter is an instrument used for measuring electric potential difference between two points in an electric circuit. It is connected in parallel. It usually has a high resistance so that it takes negligible current from the circuit.

Hope it helps you,

mark me brainliest pls.....

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Answer:

All stars in the cluster are approximately the same age.

Explanation:

An open cluster refers to a group of around a thousand stars such that these stars are surrounded by the nebula. All-stars in the cluster are approximately the same age. Milky Way consists of more than 1000 such open clusters.

Examples of an open star cluster areas follows:

1. Beehive

2. Hyades

3. Pleiades

Answer:

See explanation

Explanation:

The conversion factor from miles per hour to kilometers per hour is 1.609344.

Hence;

To convert 75mi/h to kilometers per hour,

75mi/h * 1.609344 = 120.7 kilometers per hour

b)

To convert 75mi/h to feet per second

Since

1 mile per hour = 1.46667 foot per second

75mi/h = 75 * 1.46667 = 110 feet  per second

Answer:

Explanation:

Interest to

Answer:

Points away from the south pole and toward the north pole

Explanation:

They're magnets fam

Answer:

By Newton's second law, it reduces the magnitude of the acceleration, without changing its direction.

F = unbalanced force

m = mass

a = acceleration

a = F/m

Answer:

A, They include fossil fuels and hydroelectric power.

Explanation:

Hope this helped!!!! :)) <3

Answer:

convection

Explanation:

I hope this helps

frequency is equal to number of oscillations or vibrations upon time

therefore,

check picture

Answer:

Here u go

Explanation:

Mass of air in the room m= volume of room×density of air

=(5m×4m×3m)(1.20kgm3)=72kg

Weight of air, W=mg=(72kg)(9.8ms2)=706N.

Answer:

person above is correct, i did the work and got the smae answer

Answer:

false I believe is the right answer

Answer:

True

Explanation:

Answer:

The input force (effort) is the amount of effort used to push down on a rod, or pull on a rope in order to move the weight. In this example, the force the little guy is using to pull the elephant is the input force.

Explanation:

If you did 3x18 this would equal 54

Answer:

Dimitri Mendeleev

In 1869 Russian chemist Dimitri Mendeleev started the development of the periodic table, arranging chemical elements by atomic mass. He predicted the discovery of other elements, and left spaces open in his periodic table for them.

Explanation:

0.75

According to the formula, P=IV

150 = I×200

Answer:

The third charge needs to be placed at [tex]x \approx 0.57\; \rm m[/tex].

Explanation:

Both [tex]q_1[/tex] and [tex]q_2[/tex] would attract [tex]q_3[/tex].

These two electrostatic attractions need to balance one another. Hence, they need to be opposite to one another. Therefore, [tex]q_1[/tex] and [tex]q_2[/tex] need to be on opposite sides of [tex]q_3[/tex]. That is possible only if [tex]q_3 \![/tex] is on the line segment between [tex]q_1 \![/tex] and [tex]q_2 \![/tex].

Assume that [tex]q_3[/tex] is at [tex]x\; \rm m[/tex], where [tex]0 < x < 3.72[/tex] (in other words, [tex]q_3 \![/tex] is on the line segment between [tex]q_1[/tex] and [tex]q_2[/tex], and is [tex]x\; \rm m \![/tex] away from [tex]q_2 \![/tex].)

Let [tex]k[/tex] denote Coulomb's constant.

The magnitude of the electrostatic attraction between [tex]q_1[/tex] and [tex]q_3[/tex] would be:

[tex]\displaystyle \frac{k\cdot q_1 \cdot q_3}{(3.72 - x)^{2}}[/tex].

Similarly, the magnitude of the electrostatic attraction between [tex]q_2[/tex] and [tex]q_3[/tex] would be:

[tex]\displaystyle \frac{k\cdot q_2 \cdot q_3}{x^{2}}[/tex].

The magnitudes of these two electrostatic attractions need to be equal to one another for the resultant electrostatic force on [tex]q_3[/tex] to be [tex]0[/tex]. Equate these two expressions and solve for [tex]x[/tex]:

[tex]\displaystyle \frac{k\cdot q_1 \cdot q_3}{(3.72 - x)^{2}} = \frac{k\cdot q_2 \cdot q_3}{x^{2}}[/tex].

[tex]\displaystyle \frac{q_1}{(3.72 - x)^{2}} = \frac{q_2}{x^{2}}[/tex].

[tex]\displaystyle \frac{x^2}{(3.72 - x)^{2}} = \frac{q_2}{q_1}[/tex].

[tex]\displaystyle \frac{x^2}{(3.72 - x)^{2}} = \frac{q_2}{q_1} = \frac{1}{30}[/tex].

By the assumption that [tex](0 < x < 3.72)[/tex], it should be true that [tex](x > 0)[/tex] and [tex](3.72 - x > 0)[/tex]. Therefore, [tex]\displaystyle \frac{x}{(3.72 - x)} > 0[/tex].

Take the square root of both sides of the equation [tex]\displaystyle \frac{x^2}{(3.72 - x)^{2}} = \frac{1}{30}[/tex].

[tex]\displaystyle \sqrt{\frac{x^2}{(3.72 - x)^{2}}} = \sqrt{\frac{1}{30}}[/tex].

[tex]\displaystyle \frac{x}{3.72 - x} = \frac{1}{\sqrt{30}}[/tex].

[tex]\sqrt{30}\, x = 3.72 - x[/tex].

Therefore:

[tex]\left(1 + \sqrt{30}\right)\, x = 3.72[/tex].

[tex]\displaystyle x = \frac{3.72}{1 + \sqrt{30}} \approx 0.57[/tex].

Hence, [tex]q_3[/tex] should be placed at [tex]x \approx 0.57\; \rm m[/tex].

Answer:

500 N

Explanation:

From the question,

Sum of clockwise moment = sum of anti clockwise moment.

F×d = F'×d'.................. Equation 1

Where F = Force applied to lift the load, d = distance, F' = Force required, d' = distance of the required force from the fulcrum

Make F' the subject of the equation

F' = F×d/d'.................. Equation 2

Given: F = 1200 N, d = 25 cm, d' = 60cm.

Substitute these values into equation 2

F' = 1200×25/60

F' = 500 N.

Hence the force required to balance the load is 500 N