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2 months ago

Guest #3924

2 months ago

**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.**

Guest #3925

2 months ago

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.

Question

_______ discovered that there were other galaxies besides the Milky Way. A. Edwin Hubble
B. Albert Einstein
C. Galilei Galileo
D. Sir Isaac Newton

Solution 1

The answer's A. Edwin Hubble. The Hubble space telescope was named after him.

Question

Clothes in a dryer acquire static cling by a. friction.
b. conduction.
c. induction.
d. static discharge.

Solution 1

The answer is friction. The force acting upon the comparative motion of solid surfaces, liquid layers, and material elements sliding in contradiction of each other. When sides in contact move comparative to each other, the friction amid the two surfaces changes kinetic energy into thermal energy; in other words work to heat.

Solution 2

**Explanation:**

Friction. You will discern that natural fibers, wool, and cotton do not have static. All performed fibers comprise elements that when scraped together will have static electricity.would have believed that the stainless-steel drum and another metalwork of the dryer would remove the static charge to earth. Unless of course your machine is not earthed .

Question

PLEASE ANSWER ASAP Most scientists recommend reducing carbon dioxide emissions. Less carbon dioxide in the atmosphere would be expected to reduce the rate of global warming increase damage caused by acid rain decrease the number of biotic factors in ecosystems reduce destruction of the ozone layer

Solution 1

Reduce the rate of global warming

Question

A 72 kg sled Is pulled forward from rest by a snowmobile and accelerates at 2 m/s squared forward for five seconds. The force of friction acting on the sled is 120 N backwards. The total mass of the snowmobile and driver is 450 kg. The drag force acting on the snowmobile is 540 N backwards. What is the tension in the rope.

Solution 1

So first make a force diagram. I would label forward forces + and backward forces -. Essentially, the drag force is equal to the Ft (force of tension) + Ff (force of friction on snowmobile - driver system). The force of Friction is equal to mu * Fn. We can find mu through the force of friction acting on the sled. 120 N = mu * Fn (equal to m * g of sled). mu of the Ice is equal to 0.167. So, 540 N = Ft + 0.167 * 4500 N. Ft = -211.5 N. __Ft is acting in the backwards direction at a magnitude of 211.5 N__

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