what is work in science

Answer:

Explanation: When a body covers unequal distances in equal intervals of time in a specified direction, the body is said to be moving with a variable velocity. Example: A rotating fan at a constant speed has variable velocity, because of continuous change in direction.

Answer:

Other words for saying that a wave is transmitted through a medium would be a wave transfers from one medium into another.

Explanation:

Other words for saying that a wave is "transmitted" through a medium are transmission, propagation, spread.

"Wave is a phenomenon or disturbance in which energy is transferred from one point to another without any direct contact between them." For example: Heat, light and sound is considered as a wave.

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Answer:

1) Sand cannot hold the heat. It acts like a mirror to the sun. During the daytime, it stays warm, and when the Sun is absent it loses all its heat making the nights colder. There's nothing in the desert that can either absorb heat from the sun or hold it on the surface when the sun is set.

2) Deserts are hot primarily because of a lack of water. When the sun shines on the ground, all of the absorbed sunlight goes into raising the ground's temperature. DESERTS ARE COLD AT NIGHT:Because of the lack of water in the ground, and little water vapor in the air, most deserts can get quite cool at night.

3) The temperature in the desert can change drastically from day to night because the air is so dry that heat escapes rapidly at night. The daytime temperature averages 38°C while in some deserts it can get down to -4°C at night. The temperature also varies greatly depending on the location of the desert.

The variables with the subscript "i" refer to the initial masses (m) and velocities (v) of the shark and fish.

[tex]m_{1,i}[/tex] = 10 kg

[tex]m_{2,i}[/tex] = 0.5 kg

[tex]v_{1,i}[/tex] = 5 m/s

[tex]v_{2,i}[/tex] = 0 m/s

The variables with "f" refer to the final masses and velocities. Use the law of conservation of momentum to calculate these. The law says that the total momentum of the shark and fish before the fish is eaten should be equal to the momentum after the fish is eaten. We have

[tex]m_1v_1[/tex] = (10 kg) (5 m/s) = 50 kg • m/s

[tex]m_2v_2[/tex] = (0.5 kg) (0 m/s) = 0 kg • m/s

so the total momentum before the fish gets eaten is 50 kg • m/s.

When the shark eats the fish, its mass increases by 0.5 kg. So

[tex]m_{1,f}v_{1,f}[/tex] = (10.5 kg) [tex]v_{1,f}[/tex] = 50 kg • m/s

Solve for [tex]v_{1,f}[/tex] by dividing both sides by 50.5 kg to get

[tex]v_{1,f}[/tex] = (50 kg • m/s) / (50.5 kg) ≈ 4.76 m/s

Answer:

i don't think it will work

Explanation:

because in order to lose weight, you have to do more than one stretch because weight loss takes multiple steps and not just one exercise, it would also involve you to eat healthy and to increase the pace, your friend could go running, do yoga, eat healthier, drink more water, and do more than just a core workout and etcetera.

Answer:

[tex]oh \: yeah[/tex]

Answer:

Jose lifts a 24N box with a force of 57N. What is the resulting net force?

Explanation:

Jose lifts a 24N box with a force of 57N. What is the resulting net force?

Answer:

to increase friction between the floor and the player's feet

Explanation:

It is important for basketball players to wear shoes with tread when playing in order to increase friction between the floor and the player's feet.

Friction between the floor and the player's feet will ensure that players do not trip easily during the course of playing. It also helps in such a way that players can stop quickly and run in the opposite direction without losing traction. Without this friction, it would be virtually impossible to play the game.

Answer:

c,d

Explanation:

c and d because when you heat the atom move and eɛpand

Answer:

The asteroid was not detected until it was extremely close to Earth.

Explanation:

According to data from NASA, the Asteroid named 'Astriod 2019 OK', was detected when it was extremely close to earth with just about an estimated distance of  73,000 kilometers  (45,000 miles) from the Earth.

Scientists were concerned at the proximity of this space object to the Earth before it was discovered, and it brought about a cause of concern that since it was not extremely large (estimated 57 to 130 meters wide) it creates a potential for other smaller asteroids to escape detection and struck the earth.

Answer:

sure

Explanation:

Answer:

250 times 10= 2,500, squared, the answer is 25,000

Explanation:

force= mass times acceleration, squared means multiply that number again, since 10 is squared you multiply by ten again

Answer:

.98m

Explanation:

Vf=Vi+2at

(V F)^2+2 ( change in distance )

X f= i ( change in V & T )

EK=1/2Mv^2,EG=mgh

This question involves the concepts of the law of conservation of energy, work done, Newton's Second law of motion, and equation of motion.

The box stops at a distance of "1.02 m".

First, we will use the law of conservation of energy to find out the final velocity when the box reaches the flat part.

[tex]Loss\ of\ Potential\ Energy=Gain\ in\ Potential\ Energy\\mgh=\frac{1}{2}mv^2\\\\2gh=v\\v=\sqrt{2gh}[/tex]

where,

v = speed = ?

g = 9.81 m/s²

h = height = 2 m

Therefore,

[tex]v=\sqrt{(2)(9.81\ m/s^2)(2\ m)}[/tex]

v = 6.26 m/s

Now, we will use the formula of work done to find out the force applied to the box to stop the motion:

[tex]W = Fd[/tex]

where,

W = Work Done = 100 J

F = Force applied = ?

d = displacement = 1 m

Therefore,

[tex]100\ J = F(1\ m)\\F = 100\ N\\[/tex]

Now, we will use Newton's Second Law of Motion to find out the deceleration of the person:

[tex]F=ma[/tex]

where,

m = mass = 5 kg

a = decceleration =?

Therefore,

[tex]100\ N = (5\ kg)a\\\\a=\frac{100\ N}{5\ kg}\\\\a = - 20\ m/s^2[/tex]

negative sign shows deceleration.

Now, we will use the third equation of motion to find the distance at which the box stops.

[tex]2as=v_f^2-v_i^2\\2(-20\ m/s^2)s=(0\ m/s)^2-(6.26\ m/s)^2\\\\s=\frac{40\ m/s^2}{39.24\ m^2/s^2}[/tex]

s = 1.02 m

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The attached picture shows the equations of motion in the horizontal and vertical directions.

Answer:

Vf=Vi

Explanation:

when speed is constant final velocoty is equal to initial velocity

Answer:

45m

Explanation:

speed= distance/ time

3.0= distance/ 15

*15 on both sides

45m= distance

Answer:

law of conservation of momentum

Explanation:

For a collision occurring between object 1 and object 2 in an isolated system, the total momentum of the two objects before the collision is equal to the total momentum of the two objects after the collision.

Answer:

B

Explanation:

Bubbles are a product of a chemical reaction.

The statement which best describes a chemical reaction is the cake rising

as gas bubbles form in the baking cake.

Chemical reaction involves the formation of new chemicals through  

reaction between one or more chemicals.The formation of bubbles indicate

the formation of a new gas and is a characteristic of a chemical reaction.

The formation of a bubble in the cake bake means that a new chemical has

been formed which indicates presence of chemical reaction.

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Answer:

rotation

brooo like ittttttttttttt

Answer:

then it's a rock

Explanation:

Answer:

A mixture is the physical combination of two or more substances in which the identities are retained and are mixed in the form of solutions, suspensions and colloids.

Explanation:

Answer:

A mixture is the physical combination of two or more substances in which the identities are retained and are mixed in the form of solutions, suspensions and colloids.

Explanation:

I just did the quiz on study jams and I got them all correct

Answer:

It is D

Explanation:

Make sure you read the question carefully because people get different variations

Answer:

135 N

Explanation:

Given that:

In a tug of war, team A pulls the rope with a force of 225 N; &

Team B also pulls with a force of 360 N

The magnitude of the resultant force is the difference between the two forces since they are positioned in the opposite direction.

Thus;

The magnitude = 360 N - 225 N

So, magnitude of resultant force on the rope = 135 N

An air bubble of volume 20 cm³ is at the bottom of a lake 40 m deep, where the temperature is 4.0°c. the bubble rises to the surface, which is at a temperature of 20°c. take the temperature of the bubble’s air to be the same as that of the surrounding water. just as the bubble reaches the surface

A. Fluid Friction B. Yes, there is more mass on the boat.

Explanation:

Not very sure about B but goodluck.

Answer:

120

Explanation:

1h=80

0.5h=40

1h+0.5h=80+40

=120

Answer:

i think the answer is letter c

Answer:

Its b

Explanation:

Hope this helps

Answer:

b

Explanation: