PSYCHOLOGY
Which of these statements are false ?

Answer:

The answer is Insulator, Conductor

Explanation:

A/An Insulator is a material in which charges will not move easily, whereas a/an Conductor is a material that allows charges to move about easily

Answer:

15 m

Explanation:

Given,

Mass ( m ) = 75 kg

Potential energy ( P.E ) = 11,025 J

To find : Hight ( h )

Formula : -

P.E = mgh

[ Note : The value of g = 9.8 m/s² ]

h = P.E / mg

  = 11,025 / ( 75 x 9.8 )

  = 11,025 / 735

h = 15 m

Hence,

15 m is the high off the ground must you be if you mass is 75 kg and you have 11,025 J of energy stored inside.

Answer:

11 Ns

Explanation:

Formula

Calculating Force

Calculating Impulse

Answer:

is (B) 11 N • s

Explanation:

trust me I got it right

The speed most likely representing a gas will be 334 m/sec. A sound wave is produced when a medium begins to vibrate. When an entity vibrates, a pressure wave is formed, which causes sound.

When an object vibrates, a pressure wave is created, which produces sound. The particles in the surrounding medium (air, water, or solid) vibrate as a result of the pressure wave.

The vibrations of the particles move nearby particles, allowing the sound to travel further through the medium.

Hence, the speed most likely representing a gas will be 334 m/sec.

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Given the value of the mass of each boxes, the work done in lifting the boxes to the given height is 1.6 × 10⁵J.

Work done is simply defined as the energy transfer that takes place when an object is either pushed or pulled over a certain distance by an external force. It is expressed as;

W = F × d

Where F is force applied or Weight and d is distance

Also Force = Weight = mass × acceleration due to gravity.

Since gravity is acting on the boxes as it been lift

W = Weight × height from ground level

W = mg × d

Where m is mass of the boxes, g is accelration due to gravity( g = 9.8m/s² ) and d is distance from ground level.

Given the data in the question;

To determine the work done, we substitute our values into the expression above.

W = mg × d

W = 2722.05kg × 9.8m/s² × 6.0m

W = 160056.5kgm²/s²

W = 160056.5J

W = 1.6 × 10⁵J

Therefore,  Given the value of the mass of each boxes, the work done in lifting the boxes to the given height is 1.6 × 10⁵J.

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Answer:

1200 Joules

Explanation:

PE = mgh

PE = 60 * 10 * 2

PE = 1200 Joules

The gravitational potential energy stored in a [tex]60 Kg[/tex] boy sitting at the top of a [tex]2 m[/tex] high slide is [tex]1200 J[/tex].

Potential energy is the energy possessed by a body by virtue of its position relative to others.

[tex]U = mgh[/tex]

Where,

[tex]U =[/tex] potential energy

[tex]m =[/tex] mass

[tex]h =[/tex] height

[tex]g =[/tex] acceleration due to gravity

It represents the potential an object has to do work as a result of being located at a particular position in a gravitational field.

The energy that a ball has when placed at a top of a steep hill while it is about to roll down is an example of potential energy.

Given:

[tex]m = 60 Kg[/tex]

[tex]h = 2m[/tex]

Potential energy is

[tex]U = mgh\\U = 60*10*2\\U = 1200 J[/tex]

Potential energy is [tex]U = 1200 J[/tex]

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Refraction, reflection, and total internal reflection are distinct optical phenomena. They involve the bending, bouncing, and complete reflection of light, respectively. These phenomena have practical applications and contribute to our understanding of light behavior and optical devices.

Refraction, reflection, and total internal reflection are fundamental phenomena associated with the behavior of light when it interacts with different mediums or interfaces. Let's explore each of these concepts and understand their distinctions:

1. Refraction:

Refraction refers to the bending of light as it passes from one medium to another with a different optical density. When light encounters a change in medium, its speed and direction change, causing the light ray to deviate. This deviation occurs because light travels at different speeds in different materials. The amount of bending depends on the angle of incidence and the refractive indices of the two mediums involved. Snell's law governs the mathematical relationship between the angles of incidence and refraction. Refraction is responsible for various optical phenomena, such as the bending of light in lenses and the dispersion of white light into its constituent colors in a prism.

2. Reflection:

Reflection occurs when light encounters a boundary between two mediums and bounces back into the same medium from which it originated. The angle of incidence is equal to the angle of reflection, according to the law of reflection. Reflection plays a fundamental role in our ability to see objects, as light rays reflected from surfaces enter our eyes. Mirrors and other reflective surfaces exploit the principle of reflection.

3. Total Internal Reflection:

Total internal reflection occurs when light travels from a medium with a higher refractive index to a medium with a lower refractive index, and the angle of incidence exceeds a critical angle. In such cases, instead of bending or refracting, the light is completely reflected back into the denser medium. Total internal reflection is responsible for various phenomena, including the shiny appearance of diamonds and the working of optical fibers. It enables light to propagate through the fiber by repeated internal reflections.

In conclusion, refraction, reflection, and total internal reflection are distinct optical phenomena. Refraction involves the bending of light when it transitions between different mediums, reflection refers to the bouncing back of light from a surface, and total internal reflection occurs when light is reflected back into a denser medium at an angle greater than the critical angle. These phenomena have practical applications and contribute to our understanding of light behavior and the functioning of various optical devices.

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Answer:

3.16 m/s

Explanation:

Use the formula

[tex]k = \frac{m {v}^{2} }{2} \\ v = \sqrt{ \frac{2k}{m} } \\ v = \sqrt{ \frac{2(200)}{40} } \\ v = 3.16 \frac{m}{s} [/tex]

Answer:

8.45 w

Explanation:

Power = i^2 r

            1.3 ^2 * 5 = 8.45 watts

By the use of Ohm's law, the resistance of the bulb is 121 ohms

Let us recall that power is the rate of doing work. Now we know that the voltage of the power source is 110-V and the power is 100-W.

Since;

P= IV

I = P/V

I = 100/110

I = 0.91 A

Again;

V= IR

R = V/I

R = 110/0.91

R = 121 ohms

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Answer:

A, The same amount of gravity

Explanation:

If an object goes through a chemical reaction, but does not change in mass, that object has the same amount of gravity.

A chemical reaction is a process that leads to the chemical transformation of one set of chemical substances to another. Chemical reaction include changes in color, temperature, the production of light, changes in odor, and the formation of gases.

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Answer:

Weather situations can be prepared for in many cases,

Explanation:

Answer:

a c d the correct ....

Explanation:

...........

Answer:

36 watts

Explanation:

Power = V I

          = 9 * 4 = 36 watts

Answer:

P = 36 W

Explanation:

Given that,

→ Potential difference (V) = 9 V

→ Current (I) = 4 A

→ Power (W) = ?

Formula we use,

→ P = V × I

Let's solve the problem,

→ P = V × I

→ P = 9 × 4

→ [ P = 36 ]

Hence, the power is 36 watts.

Answer:

January 1st, 2000

Explanation:

I hope this has helped you!

Answer:

Option A

Explanation:

since the woman pushed on the door, the door pushes back on the girl's hand since every action has an equal and opposite reaction.

if you need any further help make sure to ask:)

The magnitude of the change in momentum of the block between zero and 4. 0 seconds is

dp=1.6m/s

Generally, the equation for the kinematics equation is mathematically given as

x=x+ut+0.5at^2

Therefore

1.6=0+0+0.5*a*1^2

a=0.2m/s^2

In conclusion,  change in momentum

dP=mv-mu

2.0*0.8-0

dp=1.6m/s

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Answer:

296.1N

Explanation:

The formula for force of gravity is GMm/r^2, where G is the gravitational constant, M is mass object A, m is mass object B and r is distance from the CENTER of object A to object B. First, lets solve GMm. G*5.97*10^24*251=1*10^17

Now lets solve for r:

r=(Re+r)=(6.38*10^6+1.2*10^4)

While it makes sense, distance of the sattelite is in Kilometers, and we need it in meters, so:

r=(Re+r)=(6.38*10^6+1.2*10^4*1000)=18380000

now to the solving:

1*10^17/18380000^2=296.1N

Answer:

T

Explanation:

Hard to know when the wind will blow .

The principal limitation of wind power is unpredictability. this statement is very much true.

In order to produce electricity, wind turbines are mostly used in wind power as well as wind energy. In comparison to burning fossil fuels, wind energy is a well-liked, environmentally friendly, renewable energy source.

Although weather forecasting has become more accurate over time, it is still challenging to anticipate how much and when wind will blow where and when it will. Even though some regions are known to experience more wind than the others, there is currently no way to predict that however much wind here will be because of the inconsistent nature of weather patterns.

Therefore, the given statement is true.

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Your question is incomplete but most probably your full question was,  

The principal limitation of wind power is unpredictability. Please select the best answer from the choices provided

a. True

b. False

The density of the cube of wood placed in the tub of water is determined as 700 kg/m³.

The specific gravity of the wood is the fraction of the entire wood volume below water surface.

Height below water surface = 20 cm - 6 cm = 14 cm

S.G = 14 cm/20 cm

S.G = 0.7

The density of the wood is calculated with respect to density of water.

S.G = ( density of wood) / (density of water)

0.7 =  (density of wood) / (1000 kg/m³)

density of wood = 0.7 x 1000 kg/m³

density of wood = 700 kg/m³

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Answer:

C is the correct answer I believe

Explanation:

Without the Sun , Earth's land, water, and air would all be frozen. Energy is transferred from the sun to Earth via electromagnetic waves, or radiation

Energy is transferred between the Earth's surface and the atmosphere in a variety of ways, including radiation, conduction, and convection.

Answer:

C. Mantle

Explanation:

The Mantle is a thick layer of solid and partially melted rock

Answer:

C. Post your goals in an obvious place

Explanation:

Being able to look at your goals and check in on the progress of those goals in a place you know where they are so there's no worrying if you might have forgotten one or two and or havent done them is a good way to stay active and keep motivated with your goals. Making notes or specifications on those goals and trying to think over goals is also something you should do. Ignoring or forgetting your goals because you didnt write them down or put them in a secure place can ruin motivation and make you tired cause keeping track of those goals become a chore.

Answer: B) Petroleum is limited in supply

Explanation: Have a Great day!!

FORCE ACTING ON THE BODY , F = 200N

AREA ON WHICH THE FORCE IS ACTING , A = 0.05 CM²

= 0.05*(10⁻²)

= 0.05*10⁻² M²

TO CONVERT CM TO M * BY 10⁻²

PRESSURE = FORCE / AREA

PRESSURE = 200/0.05*10⁻⁴

= 200*10⁴/0.05

= 200*10⁴*10²/5

= 20*10⁵/5

= 4*10⁵ N/M².

HOPE THIS HELPS.

Answer:

Biconcave lens or Diverging lens.

Virtual Image

0.75cm on the same side as the object.

Explanation:

Biconcave lens. Biconcave lenses form all images at the same side as the object. Although a biconvex lens can exhibit the same phenomena, it only occurs when the object is in between the focal point and the optical center (object distance<focal length). From the given parameters, the object distance is 3cm and the which is obviously greater than the focal length.

So, we conclude that the lens used is a biconcave lens.

A concave lens (biconcave, plano-convex,) alway produces a virtual image.

Let u, v and f represent the object distance, image distance and focal length of the lens respectively.

In this case,

u = 3cm

v = ?

f = -1cm ( f is negative for diverging lenses)

1/f = (1/u) + (1/v)

-1 = (1/3) + (1/v)

v = -3/4cm = -0.75 cm

The negative sign means that it's a virtual image.