Help! (science class)

Answer:

1.865 * 10^-4 L

Explanation:

The equation of the reaction is:

4OH^-(aq) ----->2H2O(l) + O2(g) + 4e

Since one mole of oxygen which occupies 22.4 L is produced in the electrolysis of water by 4 Faraday of electricity as shown in the equation above;

Then;

4 * 96500 C liberates 22.4 L of oxygen

60 * 60 * 0.0200 C will liberate 60 * 60 * 0.0200 *  22.4/4 * 96500

= 1.865 * 10^-4 L

Answer:

The frequency, 'f', of a wave is given by the speed, 'v' of the wave and the wavelength, λ, of the wave

f = v/λ

The frequency, 'f', of a wave is also given by the inverse of the period, 'T', of the wave which is the time it takes the wave to complete an oscillation or a cycle

f 1/T

Therefore, the variables to be known to determine the frequency of a wave includes either, the velocity and the wavelength of the wave or the period of oscillation (the wave cycle) of the wave

Explanation:

Answer:

a

Explanation:

transverse waves travel at a right angle to the direction of the wave motion and the examples of transverse waves are water waves and radio waves of which radio produces sound.

Answer:

The correct option is A.

Sound waves travel as transverse waves.

Explanation:

Sound waves is a type of compression or mechanical vibrations that travel through a medium such as water, air and the energy of the medium through which it's travel cause the vibrations.

Sound travel as transverse waves because it move through a right angle direction of the wave movement and it travel through a medium such as air.

Example include Radio waves and water waves.

Therefore, Sound waves travel as transverse waves.

For further details, check https://brainly.in/question/2933603

Answer:

El objeto A tardará más tiempo para aumentar la temperatura.

Explanation:

Al estar ambos objetos bajo las mismas condiciones de calentamiento, entonces, ambos objetos reciben la misma cantidad de calor por unidad de tiempo.

Si ambas tienen la misma masa y temperatura inicial, pero el objeto A tiene un mayor calor específico, entonces este objeto tardará más tiempo para incrementar su temperatura en 1 °C.

Answer:

The answer is "[tex]3.92 \times 10^{16} \ m[/tex]"

Explanation:

Given:

[tex]\to v= 1.31 \times 10^8 \\\\\\to f=2.99\times 10^8 \ \frac{m}{s}\\\\[/tex]

Using formula:

[tex]\lambda=vf\\\\[/tex]

  [tex]=2.99\times 10^8 \times 1.31\times 10^8\\\\=2.99\times 1.31\times 10^{16}\\\\=3.9169 \times 10^{16} \ m[/tex]

  [tex]=3.92 \times 10^{16} \ m[/tex]

Winter

It is winter because the Northern Hemisphere is not facing the sun.

Answer:

Energy is neither created nor destroyed.

Explanation:

Answer:

x rays is the correct answer

Answer:

this is based on your opinion but mine is...

Explanation:

Do you think that the role of culture, gender,  and/or race has changed in sclence between the times we are learning  about and today's times? If so, how? If not, explain your thoughts?

Yes by how because Race’ cannot be biologically defined due to genetic variation among human individuals and populations. (A) The old concept of the “five races:” African, Asian, European, Native American, and Oceanian. According to this view, variation between the races is large, and thus, the each race is a separate category. Additionally, individual races are thought to have a relatively uniform genetic identity. (B) Actual genetic variation in humans. Human populations do roughly cluster into geographical regions. However, variation between different regions is small, thus blurring the lines between populations. Furthermore, variation within a single region is large, and there is no uniform identity.

Answer:

See Explanation

Explanation:

While it is true that a version of the second law of thermodynamics stated with respect to entropy states that the entropy of  a system only increases or remains the same. It never decreases!

It then appears to be a contradiction when the freezing of ice leads to a more ordered structure and a seeming decrease in entropy of the ice as water changes from liquid to solid.

This law of thermodynamics is not violated here because the entropy of the universe increases (freezing is an exothermic process). This outweighs the decrease in entropy of the system hence the change in entropy is positive and the second law of thermodynamics is not violated.

Answer:

r = 0.05 m = 5 cm

Explanation:

Applying ampere's law to the wire, we get:

[tex]B = \frac{\mu_oI}{2\pi r}\\\\r = \frac{\mu_oI}{2\pi B}[/tex]

where,

r = distance of point P from wire = ?

μ₀ = permeability of free space = 4π x 10⁻⁷ N/A²

I = current = 2 A

B = Magnetic Field = 8 μT = 8 x 10⁻⁶ T

Therefore,

[tex]r = \frac{(4\pi\ x\ 10^{-7}\ N/A^2)(2\ A)}{2\pi(8\ x\ 10^{-6}\ T)}\\\\[/tex]

r = 0.05 m = 5 cm

Answer:

77.8 g potassium bromide can be dissolved in 100 grams of water at 40°C.

Explanation:

In a given a line of KBr is straight.

Answer:

C

Explanation:

Answer:

You're answer would be B.

Explanation:

Fact: A water droplet refracts and disperses the incident sunlight, then reflect it internally and finally refract it again, when it emerges out of water droplet thus acting like a prism.

In Option B, It states: The combination of light and water creates a prismatic

Therefore, This option is true! However, I would say the combination of light and water make more of a chroma effect to water (my opinion)!

-♥ Have a nice day ♥-

Answer:

t.f. are you sure that's english? it looks like not a real thing

Explanation:

Answer:

d

Explanation:

astroids are not the same size so if a big astroid gets to close to a small one they will make contact or the small astroid will orbit the bigger one

Answer:

D.

Explanation:

I think don't quote me tho

Answer:

The catapult works when the potential energy stored in a stretched rubber band is converted to kinetic energy when it snaps back to its loose shape, moving the catapult arm—and the projectile! ... The kinetic energy of the catapult will give the projectile a force moving up and away from the catapult.

Explanation:

Answer:

Explanation:Wave length of a sound wave = speed / frequency1) 340 m/s / 880 Hz

Answer:

0.386m

Explanation:

                       Speed

Wavelength = -----------------

                       Frequency

                       340m/s

Wavelength = -------------- = 0.386m

                       880 Hz

Answer:

Explanation:

There are 3 main forces at work here, gravity, normal and friction. The gravity pulls the car straight down and is what keeps the car on the ground. Normal force is straight up from the points where the car is touching, so since the wheels are the only parts of the car touching the street, this is where all the normal force is. Friction force opposes any and all motion, the car wants to slide down the hill and would slide down the hill if there was no friction, so the friction force is in the opposite direction of the cars intended motion.

Answer:

I think its A

Explanation:

if its every 3 seconds wouldnt it be 3.0 Hz

Answer:

The desk is pushing back on Arianna

Explanation:

If you read newton's 3rd law, it states that for every action force (Arianna pushing the desk), there is an equal reaction force (The desk pushing back on her). This is true for EVERY OBJECT THAT HAS MOTION!

Answer:

Light is electromagnetic radiation that has properties of waves. The electromagnetic spectrum can be divided into several bands based on the wavelength. As we have discussed before, visible light represents a narrow group of wavelengths between about 380 nm and 730 nm.

OR

The primary properties of visible light are intensity, propagation-direction, frequency or wavelength spectrum and polarization, while its speed in a vacuum, 299 792 458 m/s, is one of the fundamental constants of nature.

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Actually Welcome to the concept of surface areas and Volumes.

When the radius is 'r', we get as,

V = 4/3*(π)(r^3)

when the radius is tripled that is '3r' , we get as,

V' = 4/3 (π)(3r)^3

V' = 27*(4/3(π)(r^3))

V' = 27 V

hence the new volume, when radius is tripled, is 27 times greater than the old sphere.

Answer:

technician A is right

Explanation:

Daytime running lights are auxiliary lights that allow other cars to see us better. They are not intended to illuminate the road, so their intensity is low.

Consequently technician A is right

HID lights are high intensity lights, generally bluish-white in color, yellow lights are halogen lights with lower intensity than HID lights.

Consequently, technician B is wrong

Answer:

Explanation:

The answer is 75 cm

Explanation:

Examples for effect of force - example

1) Can change the state of an object(rest to motion/ motion to rest):For example, pushing a heavy stone in order to move it. 2) May change the speed of an object if it is already moving. ... 3) May change the direction of motion of an object.

Answer:

vi = 5.25 m/s

Explanation:

We can determine the initial velocity of the runner by using the first equation of motion, as follows:

[tex]v_f = v_i + at\\[/tex]

where,

vf = final speed of the runner = 4 m/s

vi = initial speed of the runner = ?

a = deceleration of the runner = - 0.25 m/s²

t = time taken = 5 s

Therefore,

[tex]4\ m/s = v_i + (-0.25\ m/s^2)(5\ s)\\v_i = 4\ m/s + 1.25\ m/s\\[/tex]

vi = 5.25 m/s

Explanation:

Newton's law of cooling (or heating) states that the temperature of a body changes at a rate proportional to the difference in temperature between the body and its surroundings. It is a reasonably accurate approximation in some circumstances. dTdt=−k(T−T0), where k is a positive constant.

Answer:

Q=h.A.(T(t)-Tenu)

Explanation: