Almost all cells are microscopic.

True
False

ill give brainlist’s if u give them back for answering this

Answer:

1 one is answer when we throw

Explanation:

Becouse we got the 50 m

Answer:

Hey mate.....

Explanation:

This is ur answer....

3% of the earth's water is fresh. 2.5% of the earth's fresh water is unavailable: locked up in glaciers, polar ice caps, atmosphere, and soil; highly polluted; or lies too far under the earth's surface to be extracted at an affordable cost. 0.5% of the earth's water is available fresh water....

Hope it helps you,

Mark me brainliest plz....

Follow me! :D

Question:

1. Only about % of water on Earth is fresh water that is readily available for human consumption.

a. less than 1

b. 5

c. more than 50

d. All water on Earth is fresh water and is easily accessible

Answer:

a. less than 1

Answer:

1306.66N

Explanation:

Given data

r=12.0 m

v=14 m/s

m= 80kg

From the formula

F= mv^2/r

substitute

F= 80*14^2/12

F= 80*196/ 12

F= 15680/12

F=1306.66N

Hence the force applied is 1306.66N

Answer:

the glasses received 0.1131 of the total intensity

Explanation:

Given the data in the question;

the intensity is proportional to the electric field amplitude;

now, we assign the electric field of 1 to the vertical component and an electric field of 2.8 to the horizontal component

so;

Horizontal intensity =  1² = 1

Vertical intensity = 2.8² = 7.84

so total intensity = 1 + 7.84 = 8.84

fraction of the light intensity received before the glasses were put on now reaches the sunbather's eyes,

since the sunglasses blocks the horizontal intensity so only the the vertical intensity goes through;

hence

⇒ 1 / 8.84 = 0.1131 of the total intensity

Therefore, the glasses received 0.1131 of the total intensity

Answer:

The square plates of a 3000-pF parallel-plate capacitor measure 40 mm by 40 mm and are separated by a dielectric that is 0.29 mm thick and completely fills teh region between the plates.

Explanation:

Answer:

a) The car’s speed just after leaving the icy portion of the road is the first part

Explanation:

Answer:

This is your answer. If I'm right so,

Please mark me as brainliest. thanks!!

Answer:

A simple circuit definition is a closed loop of a conductor that electrons can travel around, usually consisting of a power source (a battery, for example) and an electrical component or device (like a resistor or a light bulb) and conducting wire.

Answer:

c. Bullfrogs

Explanation:

I did this lesson and got it right! :)

Answer:

Newton

Explanation:

Newton's are the standard unit of force.

Answer:

The sun.

Explanation:

The sun has the most gravitational pull.

Answer:

Velocity = 12 m/s

Explanation:

Given the following data;

Wavelength = 6 meters

Period = 0.5 seconds. This is due to the fact that the student is moving his hand up and down twice each second.

To find the velocity;

Velocity = wavelength * frequency

But, frequency = 1/period

Frequency = 1/0.5

Frequency = 2

Substituting the values into the velocity formula, we have;

Velocity = 6 * 2

Velocity = 12 m/s

Therefore, the velocity of the wave is 12 meters per seconds.

Answer:

I'd go for 'Marie drives a car'

Explanation:

Static electricity will possible form in all the scenarios, but is more likely to form when you're driving a car. This is due to the friction between the body of the car and the particles in the air around the body of the car. This is why chains are sometimes attached to fuel tankers when transporting them. The chain is made to touch the ground so that any charge built up can be safely conducted to the earth, reducing the chances of a fire outbreak due to charges igniting the fuel.

Answer:

i think its a, sorry if im wrong

Explanation:

Answer:

R = 19.36  ohms

Explanation:

Given that,

The power of an electric motor, P = 2500 Watts

The voltage of the circuit, V = 220 V

We need to find the resistance of the motor. We can find it as follows :

[tex]P=\dfrac{V^2}{R}\\\\R=\dfrac{V^2}{P}\\\\R=\dfrac{(220)^2}{2500}\\R=19.36\ \Omega[/tex]

So, the resistance of the motor is 19.36  ohms.

Answer:

R = 46,25 (Ω)

L = 0,07363 (H)

C = 2,7 *10⁻⁶ (F)

Explanation:

Statement problem does not specify if  160 (V) is peak voltage or RMS value. If 160 (V) is the peak value then for a sinusoidal wave,  RMS value is  V(rms) = 160 /√3

V(rms) =  92,49 (V)

In each branch: we have

V = I*Z         V = voltage through the impedance in (V) , I current in (A)

and Z impedance in Ω

Resistor case    Z = R  then V = 92,49 = 2 * R

R = 92,49/2       R = 46,25 (Ω)

Inductor case   |Z| = wL    Then Z = 2*π*f*L   V = 0,8 * |wl|

Inductor L in (H)       |wL| * 0,8 = 92,49   |wL| = 92,5/0,8    w = 2*π*f   2*3,14*250= 1570

1570*L = 92,49/0,8

L = 0,07363 (H)

In the case of the capacitor

|Z|  = 1/wc    = 1/1570*c

The current is 2 + 0,8 = 2,8          2,8 - 2,5 = 0,3 (A)

Again  V = I*Z        92,49 = 0,3 /1570*C

C = 0,3 / 1570*92,49

C = 2,7 *10⁻⁶ (F)

Answer:

Explanation:

The change must be 30 - - 40 which means it came in a 30 meters / second and went out in the opposite direction at 40 meters / second

The change is 70 m/sec.

You could show it to be - 70 meters per second as well. That's done by making the outgoing direction minus.

Delta v = vf - vi.

Now it depends on which way you define vf and vi.

Explanation:

36. How long does it take a car to slow down from a speed of 54 km/h to 32 km/h over a distance of 65 m? Answer in seconds. 37.

Answer:

These are the 4  correct answers that should be on your test.

A. A model can represent something very large like the solar system.

B. A model can represent something very small like a single cell.

C. A model can represent something very complex like the flow of energy in an ecosystem.

D. A model can represent something that cannot be seen or touched.

Explanation:

Answer:

a) quantity to be measured is the height to which the body rises

b) weighing the body , rule or fixed tape measure

c)   Em₁ = m g h

d) deformation of the body or it is transformed into heat during the crash

Explanation:

In this exercise of falling and rebounding a body, we must know the speed of the body when it reaches the ground, which can be calculated using the conservation of energy, since the height where it was released is known.

a) What quantities must you know to calculate the energy after the bounce?

The quantity to be measured is the height to which the body rises, we assume negligible air resistance.

So let's use the conservation of energy

starting point. Soil

          Em₀ = K = ½ m v²

final point. Higher

          Em_f = U = mg h

         Em₀ = Em_f

         Em₀ = m g h₀

b) to have the measurements, we begin by weighing the body and calculating its mass, the height was measured with a rule or fixed tape measure and seeing how far the body rises.

c) We use conservation of energy

starting point. Soil

          Em₁ = K = ½ m v²

final point. Higher

          Em_f = U = mg h

         Em₁ = Em_f

         Em₁ = m g h

d) to determine if the energy is conserved, the arrival energy and the output energy must be compared.

There are two possibilities.

* that have been equal therefore energy is conserved

* that have been different (most likely) therefore the energy of the rebound is less than the initial energy, it cannot be stored in the possible deformation of the body or it is transformed into heat during the crash

Answer:

I would say B but I could be wrong

Explanation:

Answer:

20

Explanation:

→ First perform calculation within brackets

2 × 5 = 10

→ Resubstitute back

2 × 10

→ Solve

20

Answer:

a)  v = 2.9 m / s, b) A = 0.350 m, c)    v = 2.9 m / s, d)   A = 1.00 m

Explanation:

The oscillatory motion is described by the expression

          x = A cos (wt + Ф)

the wavelength which is the distance for the wave to repeat and the frequency which is the number of times a wave oscillates per unit of time

a) In this part they ask us for the speed of the wave.

Let's use the relationship between speed, wavelength and frequency

          v = λ f

For the wavelength they indicate that the distance between two crest is 6.1 m

        λ / 2 = 6.10

        λ = 12.20 m

They give us the period of the wave is the time it takes to return to the same point, in this case they give half a period

       A / 2 = 2.10

       A = 4.20 me

        f = 1 / t

        f = ¼, 2

        f = 0.238 Hz

let's calculate

         v = 12.20 0.238

         v = 2.9 m / s

b) the amplitude of the wave, is the distance from zero to some maximum

                 2A = 0.700

                   A = 0.350 m

c) the speed of the wave is not function of the amplitude, so the speed is the same

           v = 2.9 m / s

d) the amplitude is

           2A = 0.50

             A = 1.00 m

Answer:

[tex]24.81\ \text{rad/s}^2[/tex]

Explanation:

M = Mass of cylinder = 4.31 kg

R = Radius of cylinder = 0.294 m

m = Mass of bucket = 6.27 kg

g = Acceleration due to gravity = [tex]9.81\ \text{m/s}^2[/tex]

[tex]\alpha[/tex] = Angular acceleration

a = Acceleration = [tex]\alpha R[/tex]

I = Moment of inertia of cylinder = [tex]\dfrac{MR^2}{2}[/tex]

The force balance of the system is

[tex]mg-T=ma\\\Rightarrow T=m(g-a)[/tex]

For the disk

[tex]TR=I\alpha\\\Rightarrow m(g-a)R=\dfrac{1}{2}MR^2\alpha\\\Rightarrow \alpha=\dfrac{g}{\dfrac{MR}{2m}+R}\\\Rightarrow \alpha=\dfrac{9.8}{\dfrac{4.31\times 0.294}{2\times 6.27}+0.294}\\\Rightarrow \alpha=24.81\ \text{rad/s}^2[/tex]

The angular acceleration of the pulley is [tex]24.81\ \text{rad/s}^2[/tex].

Answer:

A)2.811 × 10^-12 F

B)4.09V

Explanation:

(a) What is the capacitance?

Capacitance of coaxial cylinder can be determined using below expresion

C= (2π ε0 L)/ Ln[ rb/ra]

Where

ε0= permittivity of free space= 8.85×10^−12 Fm^-1

L= length of each cylinder =13.0 cm= 13×10^-2m

rb= radius of outer cylinder= 7.20 mm= 7.20×10^-3m

ra=radius of inner cylinder=0.550 mm= 0.550×10^-3 m

If we substitute the values we have,

C= (2π ε0 L)/ Ln[ rb/ra]

C= ( 2 × π × 8.85×10^−12 ×13×10^-2) / Ln[

7.20×10^-3/0.550×10^-3]

C=( 7.2288×10^-12 )/2.5729

C=2.811 × 10^-12 F

B) (b) What applied potential difference is necessary to produce these charges on the cylinders?

Vba= Q/C

Where Vba=potential difference

Q= charge on each = 11.5 pC. = 11.5×10^-12

C= capacitance= 2.811 × 10^-12 F

If we substitute the values we have

Vba=(11.5×10^-12)/2.811 × 10^-12

= 4.09V

Answer:

A temporary charge

Explanation:

Static electricity is not steady. Unlike current electricity, it does not have a  driving force either in the form of a voltage source or an electromotive force from a cell or a generator. Static electricity is usually due a temporary flow of charges between bodies due unbalanced charges within a system, continuing  until equilibrium is achieved.

Answer:

a is correct

Explanation:

Answer:

a) θ = 1.67 10⁻⁵ m,  b) Consequently we must affirm that the vehicle headlights cannot resolve.

Explanation:

a) To find the resolution of the camera we use the Rayleigh criterion for diffraction

            a sin θ = m λ

where m = 1 for the first zero of the slit

we must remember that the angles in the experiments are measured in radians and are very small

            sin θ = θ

we substitute

             θ = [tex]\frac{\lambda}{a}[/tex]

this expression is for a slit, in the case of circular openings the expression must be solved in polar coordinates giving

             θ = [tex]1.22 \ \frac{\lambda}{D}[/tex]

where D diameters of the opening

let's calculate

            θ = [tex]1.22 \ \frac{550 \ 10^{-9}}{ 40\ 10^{-3}}[/tex]

           θ = 1.67 10⁻⁵ m

b) let's use trigonometry to find the separation distance on earth

            tan θ = y / x

            y = x tan θ

let's calculate

remember that the angles must be in radians

                y = 250 10³ tan 1.67 10⁻0-5

                y = 4.18 m

as they indicate that the separation of the headlights is y = 1.6m,

we see that this separation is greater than the separation distance separation.

Consequently we must affirm that the vehicle headlights cannot resolve.