what are concave mirrors used in

Explanation:

The angle of incidence is always smaller than the angle of refraction

At Z ... slowest speed

At Y ... fastest speed

At X ... medium speed

Wherever it is in its orbit, the line from the planet to the Sun smears over the same amount of area every second.

That's Kepler's second law of planetary motion.

The reason this happens is: That's how gravity works. (A better explanation is available, but first you have to be able to twirl calculus and solid geometry in the air on long sticks.)

Answer:

0

Explanation:

Displacement is a vector from initial to final point. Because initial and final point are the same, so displacement is 0.

Answer:

Explanation:

In projectile,

Maximum height = [tex]\frac{u^{2}sin^{2} \theta }{2g}[/tex] and range = [tex]\frac{u^{2}sin2\theta }{g}[/tex]

u = velocity of the body

[tex]\theta[/tex] = angle of launch

g = acceleration due to gravity

If the range equals the maximum height in an ideal projectile launch on a horizontal plane, this means;

[tex]\frac{u^{2}sin^{2} \theta }{2g} = \frac{u^{2}sin2\theta }{g}[/tex]

since [tex]sin2\theta = 2sin\theta cos\theta[/tex]

[tex]\frac{u^{2}sin^{2} \theta }{2g} = \frac{u^{2}2sin\theta cos\theta }{g}\\\frac{sin\theta}{2} =2cos\theta \\sin\theta = 4cos\theta\\\frac{sin\theta}{cos\theta} = 4\\tan\theta = 4\\\theta = tan^{-1} \\4\theta = 75.9^{0}[/tex]

The angle at which the range equals the maximum height in an ideal projectile launch on a horizontal plane is approximately 76°

Answer:

How you treat someone who may have been poisoned depends on:

The person's symptoms

The person's age

Whether you know the type and amount of the substance that caused poisoning

If you are concerned about possible poisoning, call Poison Help at 800-222-1222 in the United States or your regional poison control center. Poison control centers are excellent resources for poisoning information and, in many situations, may advise that in-home observation is all that's needed.

it will experience great force

Respuesta: 181 ml

Explicación:

Dado lo siguiente:

Volumen 1 (V1) = 200 ml

Temperatura 1 (T1) = 40 ° C = 273 + 40 = 313K Temperatura 2 (T2) = (40-30) ° C = 273 + 10 = 283K

A presión constante = 1 atm

Usando la ecuación de gas combinada:

((P1V1) / T1) = ((P2V2) / T2)

(200/313) = (V2 / 283)

Multiplicar cruz

313 × V2 = 200 × 283 313V2 = 56600

V2 = 56600/313 V2 = 180.83985mL

V2 = 181 ml

Answer:

9.5%

Explanation:

Missing information :

In this question there is incorrect question .The correct question is

[tex]x\ =\frac{ab^{2} }{\sqrt{c} }[/tex]

Given :

[tex]x\ =\ \frac{ab^{2} }{\sqrt{c} }[/tex]

From the propagation of error property

[tex]$\Delta$x = $\Delta$a + 2$\Delta$b + 1$\Delta$c\\\ \ \ x = \ \ a + \ \ \ \ b + \ \ \ \ c \\[/tex]----------------------Eq(1)

Putting the respective value 4,2 and 3 in the Eq(1) we get

This gives

[tex]percentage \ error \ = 4\ +\ 2*2\ +\ \frac{3}{2}\\ percentage \ error \ = 4+4+\frac{3}{2} \\percentage \ error \ = 8+\frac{3}{2}\\ percentage \ error \ = 8+1.5\\percentage \ error \ = 9.5\\Therefore \ 9.5\%[/tex]

Answer:

acceleration = 45 m/s²

Time = 20 seconds

Explanation:

We are given;

Distance; s = 90m

Final velocity;v = 90 m/s

Since shot from rest, initial velocity;u = 0 m/s

So, to find the acceleration, we can use Newton's 2nd law of motion which is;

v² = u² + 2as

Where a is acceleration

Plugging in the values;

90² = 0² + 2a(90)

8100 = 180a

a = 8100/180

a = 45 m/s²

Now, for the time, we will use Newton's 1st law of motion which is;

v = u + at

Where t is time;

So;

90 = 0 + 4.5t

90 = 4.5t

t = 90/4.5

t = 20 seconds

Explanation:

The conductivity of water can be increased by adding any solute that increases the number of ions in solution.

Hope this helps you.. Good luck

The conductivity of water can be incrased by adding to it anything that disolves and ionizes in it.

Examples:

-- sugar

-- coffee

-- tea

-- artificial sweetener  

-- baking soda

-- orange juice

-- corn starch

-- salt

Answer:

15 mph

Explanation:

t ÷ d

time ÷ distance

30÷2

=15

Answer:

15 mph

Explanation:

Speed can be found using the following formula.

s=d/t

where d is the distance and t is the time.

The car traveled 30 miles in 2 hours. Therefore, the distance is 30 miles and the time is 2 hours.

d=30 miles

t=2 hours

s= 30 miles/2 hours

Divide 30 by 2

s=15 miles/hour

The car's speed is 15 miles per hour.

Answer: 5

We write the number 157,821 by moving the decimal place to the left

until the first number, taking note of the number of times you moved it.

Therefore, it is written as 1.57821 x 10^5. The power of 10 would be 5.

Answer:

The energy possessed by a body by virtue of its position relative to others, stresses within itself, electric charge, and other factors.

Explanation:

Hope this helps & plz mark brainiest

Answer:

energy that is still

Explanation:

( long definition)

the energy possessed by a body by virtue of its position relative to others, stresses within itself, electric charge, and other factors

// have a great day //

Answer:

A rubber rod can be charged negatively when it is rubbed with wool. If the rubber rod is charged negatively, a positive charge is induced into the wool. Remember, whenever two neutral objects are rub against each other , an opposite charge is induced in both of the objects.

The impact on the charge of the wool should be explained below:

A rubber rod could be charged negatively at the time when it is rubbed with wool. In the case when the rubber rod is charged negatively, a positive charge should be induced into the wool. Also, whenever two neutral objects are rubbed against each other, an opposite charge should be induced in both of the objects.

Learn more about charge here: https://brainly.com/question/13030344

Answer:

The 500 would be able to keep a light bulb on longer.

Explanation:

The 500 would be able to hold more charge than the 100 which means it can keep the light bulb lit for longer.

Answer:

  500 m

Explanation:

The applicable relation is ...

  wavelength = speed/frequency

  wavelength = (5000 m/s)/(10 cycles/s) = 500 m/cycle

The wavelength is 500 meters.

Answer:

d = 6 km

Explanation:

In this case we have the relative speed of the boot changes, suppose that the boat and the river have the same direction when the boat goes from A to point B

       vbr = vrt + vbt

        vbr = 2 + 4

        vbr = 6 km / h

        v₁ = 6 km / h

velocity is constant

         v₁ = d / t₁

         t₁ = d / v₁

when the boat returns to the starting point the speed is both opposite

        vbr = vbt - vrt

        vbr = 4-2

        vbr = 2 km / h

        v₂ = 2 km / h

as the speed is constant

         t₂ = d / v₂

they also indicate that the total time is 4 h

       t₁ + t₂ = 4

we substitute

       4 = d / v₁ + d / v₂

       4 = d (1 / v₁ + 1 / v₂)

       d = 4 / (1 / v₁ + 1 / v₂)

let's calculate

       d = 4 / (1/6 + 1/2)

       d = 4 / 0.6666 67

       d = 6 km

Answer:

she will have a reduced ability to fight airborne pathogen.

Explanation:

This is because the tonsils have an ability to fight airborne diseases as well as protect the body from pathogens

Answer:

270 s or 4.5 min

Explanation:

First find the amount of heat needed:

q = mCΔT

q = (1.5 kg) (4200 J/kg/K) (100 − 15) K

q = 535,500 J

q = 535.5 kJ

Power is energy per time.

P = E / t

2 kW = 535.5 kJ / t

t = 270 s

Answer:perpendicular

Explanation:

The electric current always generated the magnetic field that should be perpendicular to the field.

In the case when the work should be compassed when the pointing is to be done along with the magnetic field lines so this represent that there should be the magnetic field that should be near the wire via the current should be flowing. here the magnetic field generated by the electric current should always be perpendicular to the current flow direction.

Learn more about electric current here: https://brainly.com/question/24301101

Answer:2.01201

Explanation:

Answers:

In short, the boxes you check will be box 1, box 3, box 6.

================================================

Explanation:

It's not stated, but I'm assuming that A,B,C are three dimensional vectors

I'll go through each answer choice to say whether it's valid or not.

---------------------------

Choice 1

A x B is some vector

(A x B) x C is some other vector. Cross products produce vectors as outputs, when the two inputs are both 3D vectors. The output vector is the same dimension as the inputs.

Overall, the expression (A x B) x C is valid.

---------------------------

Choice 2

A dot B is a scalar

(A dot B)C is some vector

A dot (B x C) is a scalar

We cannot add a scalar to a vector. The given expression (A dot B)C + A dot (B x C) is not valid

---------------------------

Choice 3

B x C is a vector

B dot (B x C) is scalar

A[ B dot (B x C) ] is a vector in the form kA with k as a scalar.

The overall expression is valid

---------------------------

Choice 4

B x C is a vector

B(B x C) is not valid. We need to use a dot or cross symbol between the B and (B x C).

If we had kB with k as a scalar, then we don't need a symbol between them.

---------------------------

Choice 5

A dot B is a scalar

Scalars are not allowed when it comes to cross products, so (A dot B) crossed with anything is not valid.

---------------------------

Choice 6

B x C is some vector

A dot (B x C) results in a scalar

The expression is valid

Answer:

Polonium(Po)

Explanation:

Answer:

B. polonium (Po)

Explanation:

i took the test

Answer:

The correct option is;

B. Throughout all of history

Explanation:

A body of knowledge comprises of a given collection of concepts, activities and terms that represents a professional discipline that is outlined by the associated scholarly society, therefore, scientific knowledge, being comprised of very diverse field of knowledge, with different approaches and  changing understanding is taking as a process of learning about the universe data collection, experimenting analysis and communication with a theme of systems, equilibrium, models and constant change which makes the basis of the body of scientific knowledge to be throughout all of history.

Answer:

This is because of the static electricity which is generated in bodies due to friction. Time to time, the door knob gets touched by many people and the charge on it goes on increasing because of increasing friction. When the charge is increased much, after a considerable time, one may get a spark or a mild shock.

Answer:

Natural areas, historical areas, and recreation areas

Answer:

the answer is B wildlife refuges

Explanation:

Answer:

zinc and hydrochloric acid

Explanation:

Answer:

The reactants he used in the first experiment were zinc metal and hydrochloric acid.

Explanation:

edmentum

Answer:

Deposition

Explanation:

Answer:

deposition

Explanation:

qasdsfa32