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2 months ago

Guest #4057

2 months ago

The energy from the sun that reaches the corn is about two billionths.

Guest #4058

2 months ago

**Answer:**

It depends upon the sunlight intensity known as ALBEDO, the amount of energy used by photosynthesis and the chemical composition of corn.

**Explanation:**

Albedo is a measure of the amount of light reflected from an object. Albedo is normally expressed as a decimal value representing the percentage of light reflected.

Photosynthesis, a biological process, uses the energy of sunlight to manufacture sugar, which serves as the universal food for life. Oxygen produced as a product of photosynthesis is released into the environment.

The formula for this reaction is:

6CO2 + 6H2O + sunlight energy → C6H12O6 + 6O2

• where CO2 represents carbon dioxide

• H2O represents water

• C6H12O6 represents the sugar molecules (carbohydrate)

• and O2 represents oxygen

Question

Score: The _____ theory is the most accepted theory regarding the origin of the solar system. It suggests that our star, the Sun, was first created by a cloud of dust and gas.

Solution 1

The most popular and widely accepted theory for the birth of Solar System is the "Nebular Hypothesis"

Question

Jake and brenda drove at a speed of 30 miles for one hour then they turned around and drove 45 miles per hour until they were back where they started what is the true or what is true about their average speed and average velocity

Solution 1

**Answer:**

Average speed is greater than average velocity. Average velocity is zero.

**Explanation:**

Average speed is calculated by:

Distance is the length of the total path traveled.

Average velocity is given by:

Displacement = final position - initial position.

Since, final position =initial position, Displacement = 0, therefore, average velocity = 0

It can be concluded that average velocity is zero and average speed is greater than average velocity.

Solution 2

Their average speed is greater than their average velocity.

Question

How does the doppler effect affect the velocity from a sourse that is approaching you?

Solution 1

The apparent change in the frequency of a sound caused by the motion of either The Listener or the source of the sound

Question

((Psychology))An action that benefits others but not ourselves is an example of: A. personal norms.
B. altruism.
C. facilitation.
D. social responsibility.

Solution 1

**Answer: Option (B) is the correct answer.**

**Explanation:**

When a person without any selfish motive does something for the benefit of others then it is known as altruism.

For example, a person organizes a food stall every weekend for the poor people of a village.

Therefore, we can conclude that **an action that benefits others but not ourselves is an example of altruism.**

Solution 2

B altruism.

al·tru·ism

ˈaltro͞oˌizəm/Submit

noun

the belief in or practice of disinterested and selfless concern for the well-being of others

al·tru·ism

ˈaltro͞oˌizəm/Submit

noun

the belief in or practice of disinterested and selfless concern for the well-being of others

Question

Two men each have a mass of 90 kg. If the gravitational force between them is 8.64 10-8 N, how far apart are they? G = 6.67 × 10-11 N⋅(m/kg)2

Solution 1

Applicable formular:

F = Gm1m2/d^2, where F = gravitational force, m1 & m2 = mass of the two bodies, G = Gravitational constant, d = distance between the bodies.

Substituting;

8.64*10^-8 = (6.67*10^-11*90*90)/d^2

d^2 = (6.67*10^-11*90^2)/(8.64*10^-8)

d = Sqrt [(6.67*10^-11*90^2)/(8.64*10^-8)] = 2.5 m

The two men are 2.5 m apart.

F = Gm1m2/d^2, where F = gravitational force, m1 & m2 = mass of the two bodies, G = Gravitational constant, d = distance between the bodies.

Substituting;

8.64*10^-8 = (6.67*10^-11*90*90)/d^2

d^2 = (6.67*10^-11*90^2)/(8.64*10^-8)

d = Sqrt [(6.67*10^-11*90^2)/(8.64*10^-8)] = 2.5 m

The two men are 2.5 m apart.

Solution 2

**Answer:**

2.5

**Explanation:**

-a p e x

Question

I would love to stretch a wire from our house to the Shop so I can 'call' my husband in for meals. The wire could be tightened to have a tension of 240N and a m/L 'weight' of 0.05kg/L. How long would it take for my pulse wave to travel to the Shop (24m) to ring a bell to indicate dinner time.

Solution 1

Note: I'm not sure what do you mean by "weight 0.05 kg/L". I assume it means the mass per unit of length, so it should be "0.05 kg/m".

Solution:

The fundamental frequency in a standing wave is given by

where L is the length of the string, T the tension and m its mass. If we plug the data of the problem into the equation, we find

The wavelength of the standing wave is instead twice the length of the string:

So the speed of the wave is

And the time the pulse takes to reach the shop is the distance covered divided by the speed:

Solution:

The fundamental frequency in a standing wave is given by

where L is the length of the string, T the tension and m its mass. If we plug the data of the problem into the equation, we find

The wavelength of the standing wave is instead twice the length of the string:

So the speed of the wave is

And the time the pulse takes to reach the shop is the distance covered divided by the speed:

Question

A wave is traveling through a particular medium. The wave source is then modified so that it now emits waves at a higher frequency. Does the wavelength A.)increase
B.) decrease
C.) stay the same
D.) depend on other factors

Solution 1

The correct answer is

B.) decrease

In fact, the relationship between frequency, wavelength and speed of a wave is given by

where

is the wavelength

f is the frequency

v is the speed of the wave

The speed v of a wave depends only on the properties of the medium; in this problem the medium does not change, so the speed remains the same.

Instead, the frequency f increases: from the previous equation we see that the wavelength is inversely proportional to the frequency, therefore if the frequency increases, the wavelength will decrease.

B.) decrease

In fact, the relationship between frequency, wavelength and speed of a wave is given by

where

is the wavelength

f is the frequency

v is the speed of the wave

The speed v of a wave depends only on the properties of the medium; in this problem the medium does not change, so the speed remains the same.

Instead, the frequency f increases: from the previous equation we see that the wavelength is inversely proportional to the frequency, therefore if the frequency increases, the wavelength will decrease.

Question

Four beats per second are heard when an unknown tuning fork and a 240 Hz tuning fork are struck simultaneously. This same unknown tuning fork and a 250 Hz tuning fork are struck. Six beats are heard. Its exact frequency?

Solution 1

The absolute difference between two frequencies is referred to as beat frequency. That is,

fb = |f2-f1|

In this case, the frequency of unknown fork must be between 240 Hz and 250 Hz. Then,

4 = x - 240 => x = 240+4 = 244 Hz

This is true since;

6 = 250 - 244 (given in the second case).

Therefore, the unknown frequency is 244 Hz.

fb = |f2-f1|

In this case, the frequency of unknown fork must be between 240 Hz and 250 Hz. Then,

4 = x - 240 => x = 240+4 = 244 Hz

This is true since;

6 = 250 - 244 (given in the second case).

Therefore, the unknown frequency is 244 Hz.

Question

The retina, which consists of three layers of neurons (photoreceptor, bipolar, and ganglion) is responsible for detecting the light from these images and then causing impulses to be sent to the brain along the ____. A. ganglion cell
B. optic nerve
C. photoreceptors
D. wavelengths

Solution 1

Optic nerve

__Optic nerve is a cable-like bundle of nerve fibers, that connects and transmits visual information from the eye to the brain.____Optic nerves are made of retinal ganglion cell axons. Optic nerve recieves light signals from photoreceptor cells via intermediate neurons, bipolar and amacrine cells.__- The retina, which consists of three layers of neurons (photoreceptor, bipolar, and ganglion) is responsible for detecting the light from these images and then causing impulses to be sent to the brain along the
.__optic nerve__

Solution 2

B. Optic nerve

Optic nerve: carries messages from the photoreceptors in the retina to the brain

Optic nerve: carries messages from the photoreceptors in the retina to the brain

Question

In which of the following units is acceleration expressed? a. Meters per second squared
b. Foot-pounds
c. Kilograms
d. Newtons

Solution 1

**Answer : The correct option is, (A) Meters per second squared**

**Explanation :**

**Acceleration **: It is defined as the rate of change of velocity in unit time. It is a vector quantity. That means it is depend on the magnitude and the direction.

**The S.I unit of of acceleration is, meter per second square **

From the given options, **option A **is represent the unit of **acceleration**.

The **option B** represent the unit of **energy**.

The **option C** represent the unit of **mass**.

The **option D **represent the unit of **force**.

**Hence, the correct option is, (A)**

Solution 2

A. Meter per second squared

This is the Right One.

This is the Right One.

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