object's velocity will not change unless it is acted on by a(n)
O net force.
O strong force.
O unbalanced force.
O opposite but equal force

The distance that a point on the edge of the wheel would have traveled in 6.8 seconds of time is 19.85 meters.

The rate by which the body changes its angle with respect to the time is called the angular velocity of a body.

Given, wheel 31 cm in diameter accelerates uniformly from 240 rpm to 360 rpm in 6.8 s.

Given ω0 = 240,

ω0 = 240 (0.1047)

= 25.1 rad/s

α2 = 360 (0.1047)

= 37.7 rad/s

The angular acceleration is given as,

a = Δω/t

= ω - ω0/t

= 37.7 - 25.1/6.8

So, a = 1.85 rad/s²

AS we know, Ф= ω0t + 1/2 a t²

= 25.1 * (6.8) + 0.5 * (1.85) * 6.8²

= 85.34 + 42.77

Ф = 128.11 rad

length of travel, l = Ф *d/2

=  128.11  * 0.31/2

l = 19.85 m

Thus, distance that a point on the edge of the wheel would have traveled  is 19.85 meters.

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The mass of the soft drink is 3.05 kg.

The heat energy must be removed in order to cool the soft drink is 227,835 J.

The mass of the soft drink is calculated by applying the following formula.

m = ρ V

where;

m =  1015 kg/m³ x 0.003 m³

m = 3.05 kg

The heat energy must be removed in order to cool the soft drink is calculated as;

Q = mcΔθ

where;

Q = mcΔθ

Q = 3.05 x 4150 x (23 - 5)

Q = 227,835 J

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The gravitational potential energy of a 59 kg pole vaulter changes by 2360 J if center of mass rises by 4.0 m during the jump.

The gravitational potential energy is the energy in an object due to change in its position. To say in simple terms, this energy is related to gravitation force. This energy does not depend on the path, but depends on the height to which an object is raised.

The formula for finding gravitational potential energy acquired by an object that is raised to a height "h" is

E=mgh

So, we have,

E= 59×10×4

= 2360 J

The potential energy gained by the pole vaulter is 2360 J.

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0.265m/sec is the acceleration of the block when it is pulled with force of 5.3n having mass 2kg with friction 0.9N

F=ma, Where as F= force m= mass a= acceleration f = friction

F=5.3N  m=2kg a=? f=0.9N

The net force applied on the block is original force - friction force which is

(F-Ff)=ma

5.3- (5.3)(0.9)= 2x a

a= 0.265m/sec

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It is desired to project the image of an object four times its actual size using a lens of focal length 20 cm, then the object should  be placed 25cm away from the lens.

Lens is a transmissive optical device which focuses or disperses light beam by means of refraction.

Given focal length, f= 20 cm

and h1= 4h0

So, h1/h0= m = 4

Hence, v/u = 4

and v= 4u

As, 1/v - 1/u = 1/f

Now, 1/4u-(1/-u)= 1/20

5/4u= 1/20

So, u = 25 cm

The object should  be placed 25cm away from the lens.

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Answer:

The higher the concentration, the denser the liquid.

Explanation:

Changing concentration of a solution changes the density of the solution . Density is the ratio of mass and volume whereas concentration is the ratio of minor part that is, it is solute to the major part i.e. solvent.

If the amount of matter is increased without changing the volume, then the density increases

i hope this helped

The speed of sound in air at the temperature of 136°F (331 K) = 365.71 m/s

The speed of sound in air depends on temperature, so the higher the temperature, the greater the value of the speed of sound.

The equation for determining the speed of sound with a change in temperature is:

v = v₀ + 0.6(∆T)

where:

v = the final sound velocity (m/s)

v₀ = the initial sound velocity (m/s)

∆T = temperature change (°C)

Note: The speed of sound in air at 0°C is 331 m/s.

We have ∆T = 136°F ⇒ 57.85°C

So,

v = 331 + 0.6 (57.85)

= 365.71 m/s

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3.24 m/s² is the box's horizontal acceleration in accordance with the query.

The word "force" has a specific meaning in science. At this level, calling a force a pushed or a pull is entirely appropriate. A strength isn't something an object "has in it" or that it "contains." One thing experiences a force from another. Here are both living things and non-living objects in the concept of an energy. kicking a ball, pushing and pulling on the door, or kneading dough are a few examples.

Horizontal component is 200cos(36°) = 80.9 N

Then,

F=ma

100 = 25a

a = 3.24 m/sec²

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Hot a most massive planet, Jupiter uses the same mass star for all schematics.

Some examples of the power of gravity are as follows: the force that holds the gases in the sun. the force used to propel a ball downward after it has been hurled into the air. the mechanism that causes a car to drift downhill even when the gas pedal is not depressed. a glass you dropped hitting the ground with power.

Because it consistently attempts to pull masses together rather than pushing things apart, the gravitational force is known as attractive. It is obvious that the gravitational force is inversely correlated with the masses of the two interacting objects.

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Orange, Blue, and Red are the three filters. They are easy to attach and cover the lens and flash on the front of the Polaroid Go camera.

The primary benefit of Polaroid photography is the immediate visual feedback. Sharing Polaroid photos is one of the simplest things you can do with them.

An image of a friend is taken and given to the friend. Being one-to-one rather than one-to-the-world makes it a little different from other forms of sharing. Polaroid started to lose some of its major clients in the real estate, insurance, and photo identi-fication industries as digital cameras proliferated on the market.

As film sales collapsed, Polaroid declared bankruptcy in October 2001. A series of chemicals and dyes are sandwiched between layers to make up a Polaroid;

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In the electric field, the like charges repel each other, and the unlike charges attract each other, whereas in a magnetic field the like poles repel each other and the unlike poles attract each other.

Electric field is a region or space around a conductor where electric force can be felt. While magnetic field is the region or space around a bar magnet where magnetic force can be felt. Electric and magnetic force are both force field and they are both vector field.

In electric field, like charges repel and unlike charges attract similarly like poles repel and unlike poles attract in magnetic field.

One difference between magnetic poles and electric charges is that magnetic pole always appear on a magnet as north and south pole but a single entity of charge can exist.

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Answer: because not all asteroids hit them

Explanation:

there isn’t much wind in space to direct the asteroid

The coefficient of friction between two surfaces will not be same as it always depends on the nature of both surfaces.

It is not necessary that coefficient of friction between two surfaces will be same. The coefficient of friction will depend on the objects that are causing friction and the value is usually between 0 and 1 but sometimes, it can be greater than 1. A value of 0 implies that there is no friction at all between the objects (in case of superfluidity).

The coefficient of friction for an ice block placed on a copper surface will be different than the coefficient of friction for a wooden block placed on the same surface.

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Sports shoes provide more than just a protective cover for the feet. They should provide support for the ways the feet and ankles will move and be adaptable to the terrain.

The right footwear must be designed specifically for the movements of one's sport, whether basketball or other forms of exercise. Elements like shock absorption, ankle support, balance and stability are very essential for better performance.

Different kind of shoes are suited for certain sports. If you are playing a particular sport for more than 2 days a week then, choose a pair of shoes suitable for that particular sport to protect yourself from injury.

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Two real life examples of increasing friction are: tires of car are made rough to increase the friction and when a ground becomes slippery after rain then it is made rough by using sand to increase friction.

Friction can be increased by : making the surfaces rough, pressing the surfaces harder against each other, increasing normal force, using sliding motion rather than rolling motion and increasing contact surface area.

When we walk on the ground or the floor then  it is the frictional force only that is responsible for holding our feet to the ground. On slippery surfaces or ice, the friction is less, therefore we tend to slip on these surfaces.

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The area under the curve in a PV-diagram represents the work done to the gas. If the area is maximum, the amount of work completed will be the highest. In this scenario, area is maximal when we take path A.

The related changes in volume and pressure in a system are represented by a pressure-volume diagram, also known as a PV diagram or a volume-pressure loop.

Thermodynamics, cardiovascular physiology, respiratory physiology, all frequently use them. The fourth and the most basic state of matter is gas. Its possible for atoms to make up a pure gas.

W = P* change in volume = 1.7 * 1.01 * 5.8 * 105 is the formula for the work completed.

W = 9.96 * 10⁵ J

The question is incomplete. The diagram is missing in the question. It is attached to this answer.

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a) The energy of a photon with a wavelength of 550 nm is 3.58 10⁻¹⁹J. The equivalent energy in J is 2.40* 10⁻¹⁸ eV. a photon of 10 nm.

b) Its wavelength of an x-ray photon is 0.165 nm.

The wavelengths of a wave is the distance in between adjacent subsequent crests. It is evaluated in the direction of the wave. A wave's length is commonly denoted by the Greek letter lambda (). The ratio of a light train's frequencies (f) and velocity (v) in a medium is its dimension.

By comparing the distance between the two identical locations on adjacent waves, the wavelengths can always be found. When determining the duration of a longitudinal wave, the distance from one compression to the next or from one seismic waves to the next is measured.

Briefing:

E=hcλ

E=(4.136×10−15 eV s)(3.0×108 m/s)550×10−9 m

E=2.40 * 10⁻¹⁸eV.

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Answer: Pressure exerted by the boy is 4×[tex]10^{5}[/tex] pa.

Explanation:

Given: Mass (m) = 50 kg

Gravitational force (g) = 10 [tex]m/s^{2}[/tex]

Width of a blade = 0.5 cm

Length of a blade = 25 cm

To find: P = ?

As we know that,

Pressure [tex]P = \frac{F}{A} ...(1)[/tex]

Where, F is force and A is Area

Force is given by,

[tex]F = mg[/tex]

[tex]F = (50)(10)[/tex]

[tex]F = 500 N[/tex]

Area is given by,

Area = length × Width

         [tex]= (0.5)(25)\\= 12.5 cm^{2} \\[/tex]

Convert the area into [tex]m^{2}[/tex].

⇒ Area = [tex]= 0.00125m^{2}[/tex]

Put the value of F in equation (1)

[tex]P = \frac{500}{0.00125}[/tex]

[tex]P = 400,000 pa[/tex]

P = 4×[tex]10^{5}[/tex] pa

Hence, Pressure exerted by the boy is 4×[tex]10^{5}[/tex] pa

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If the mass of one object is doubled and the mass of the other object is tripled and the separation distance between the objects' centers is doubled, then the new force of gravitational attraction would be 210 units.

What is the gravitational force between two objects?

The gravitational force of attraction between two objects in the universe is directly proportional to the product of masses of the object and inversely proportional to the square of the distance between the objects.

F = Gm₁m₂/r²

where;

when mass of one object is doubled and the mass of the other object is tripled, we will have;

F' = G(2m₁ x 3m₂)/r²

Also when separation distance between the objects' centers is doubled,  the new force of gravitational attraction becomes;

F' = G(2m₁ x 3m₂)/(2r)²

F' = G(2m₁ x 3m₂)/(4r²)

F' = 6/4 (Gm₁m₂/r²)

F' = 6/4 (F)

F' = 6/4 (140 units)

F' = 210 units

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Answer: 3 kg

Explanation:

The formula for potential energy is Ug=mgh where Ug is potiental energy, m is mass, g is the acceleration caused by gravity which is either 9.8 m/s^2 or 10m/s^2 depending on your textbook and h is the height and or displacement. So…

120 = m(10)(4)

120=40m

m= 3 kg

Answer:

Explanation:

Given:

h = 4 m

W = 120 J

g = 10m/s²

_________

m - ?

W = m*g*h

m = W / (g*h) = 120 / (10*4) = 3 kg

When a light wave hits the surface of a pool, some of the light will be reflected off the surface, while the rest will be absorbed by the water and pass into the pool. The angle at which the light hits the surface will determine how much light is reflected and how much is absorbed. If the light hits the surface at a perpendicular angle (90 degrees), most of the light will be reflected, resulting in a strong, sharp reflection on the surface of the pool. If the light hits the surface at a shallow angle (less than 90 degrees), more of the light will be absorbed by the water, resulting in a weaker or distorted reflection on the surface.

The light that is absorbed by the water will continue to travel through the water, but its intensity will decrease as it travels. This is due to a process called absorption, where the water molecules absorb the energy from the light and convert it into heat. The deeper the light travels into the pool, the more the water will absorb the light, and the dimmer the light will become.

Additionally, the light that enters the pool may be scattered by particles or other objects in the water, which can cause the light to spread out and become less focused. This can cause the light to appear blurry or distorted when viewed from different angles. The color of the light may also be affected by the water, as different colors of light have different wavelengths and are absorbed by the water at different rates. This can cause the light to appear different colors when viewed from different depths in the pool.

When fundamental frequency, length and tension is given then the wire's mass per unit length is 9.23 * 10 ^-3 g/m.

The fundamental frequency is defined as the lowest frequency of a periodic waveform. Fundamental frequency is defined as the average number of oscillations per second and is expressed in Hertz.

Given ; length , l= 0.54m Tension, T = 1373N

Frequency , f = 357 Hz

f= (1/2l)*(√T/m)

m = T/(4l² f²)

= 1373/(2*0.54² * 357²)

m= 9.23 * 10 ^-3 g/m

The wire's mass per unit length in grams/meter is 9.23 * 10 ^-3 g/m.

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a) The speed in meters per second is 10996.2  meters per second.

b) The Time taken is 10.97 hours.

We must be able to remind ourselves that speed is the ratio of the distance that is covered to the time that is taken to orbit the earth. If we have this definition at the back of our minds, we can now see that it would be easy for us to be able to obtain the speed if we do have the distance and the time or make the necessary manipulations so as to be able to obtain any of the parameters that have been required in the speed formula as described above.

We know that;

1 mile per hour = 0.447 meters per second

24,600 mile per hour =  24,600 mile per hour * 0.447 meters per second/ 1 mile per hour

= 10996.2  meters per second

Given that;

Distance = 270,000 miles - 150 miles = 269850 miles

Time = ?

Speed = 24,600 mph

Time = Distance/ speed

=  269850 miles/ 24,600 mph

= 10.97 hours

The speed of the Orion Space Capsule is  24,600 mph.

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Technology is the universe of tools, means, and methods through which we interact with our environment. [TRUE]

Apart from being divided into several types, technology will then provide many benefits in all fields.

1. Easy to receive information

The first positive side of technological development is the ease of receiving information, both locally and internationally. Unlike in the past, in this modern era, we don't have to bother buying newspapers.

2. Easy to communicate

With the messaging application that can send messages, both voice messages and text messages as well as telephone, which will then make it easier to communicate. Unlike the past, communication still has to be through letters and you have to send it to the post office. This letter cannot directly reach the recipient of the letter. It also requires quite expensive costs and takes a long time.

3. More Practical Shopping

In the past we had to go to the market or other shopping places and it took a long time. It's different from now, you can simply order various needs just by using an online shopping application. Then pay for it and wait for the order to arrive at home without the hassle of leaving the house.

4. Learning becomes easier

In the past we had to buy thick books and cost a lot. Right now you only need to buy ebooks, although not a few are paid, but there are many e-books that you can get for free. Besides being able to read books easily, the rapid development of technology will then facilitate the teaching and learning process. Especially during a pandemic like this. The benefits of this technological development are also very necessary for students and teachers who teach.

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A 500. Kg car is driving with a speed of 4.00 m/s, the momentum of car is 2000 kg.m/sec

Momentum is characterized as the intensity of a body's motion. As momentum relies on both velocity and the direction of the body's motion, it is quantified by "mass velocity". Because velocity is a vector, momentum is a also a vector quantity, whereas mass is a scalar number.

Given that,

mass of car (m) = 500 kg

velocity of car (v) = 4.00 m/sec

Thus, momentum (p) = m × v

p = 500 kg × 4.00 m/sec

p = 2000 kg.m/sec

Thus, momentum of car is 2000 kg.m/sec

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These are the physical quantities.

a physical quantity is any of the physical property of to a  material or system that can be quantified, that is, can be a  measured using numbers. A physical quantity can be the  expressed as a value of the  which is the algebraic of the multiplication of a numerical value and a unit.

We have to talk about the correlations between the quantities. There's an additional term called acceleration. Talk about how fast you can get. The largest charities are referred to as the term and largest charities are referred to as the term  and largest charities are No for food and physical quantities. We have something for rotation. There is a physical quantity. We have physical quantity now. We have a moment of inertia that can be used to work for work or work as well. I will call you either by talk or rotation. We have a kind of technology that rotates for linear momentum and P. This is a moment for impulse. We have an impulse if it's for something.

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Answer:

Explanation:

Given:

Q =  30J   (The system did not prepare energy, but allocated)

W =  + 50 J  (System operation)

__________________

ΔU - ? (Change in internal energy)

ΔU = Q - W =  30 - (50)  = - 20J

Answer:

because of the softness

Explanation:

the bounency of the floor makes it to where it bounces instead of breaking

One advantage of using a solid-state detector is that it converts part of the particles energy directly into electric current.

Solid-state devices are sensitive to charged particles and are essentially transparent to gamma rays. Compared to conventional detectors, they are physical of remarkably small size.

Solid-state detectors provide a signal by collecting the charge liberated in the passage of the particle through a semiconductor.

Solid-state detectors are also called Semiconductor Radiation detectors. In these detectors, a semiconductor material like a silicon or germanium crystal constitutes the detecting medium.

An extremely pure solid-state detector is called an intrinsic semiconductor. An example of intrinsic semiconductors is silicon and germanium.

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Among electromagnetic waves, UV rays are most dangerous because exposure to these radiation cause serious problems in living organism. Therefore, the frequency of wave is 25 Hz.

Electromagnetic wave is a wave which contain two component one is electric component and other is magnetic component. The electric and magnetic component are perpendicular to each other. There are so many wave that comes under electromagnetic wave like infrared wave , radio wave

speed of wave= distance travelled by wave ÷ time taken by the wave

speed of wave=  5,000m/s

distance travelled by wave = wavelength of wave = 200 meters

Substituting all the given values in the above equation, we get

5,000m/s=  200 meters ÷ time taken by the wave

time taken by the wave= 0.04 s

Frequency = 1 ÷time taken by the wave

                  = 1÷0.04

                  =25 Hz

Therefore, the frequency of wave is 25 Hz.

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