Suppose a log's mass is 5kg. After burning, the mass of the ash is 1 kg. Explain what could have happened to the other 4kg. Help i can't figure this out.

Answers

Answer 1

Answer: Mass never just disappears. The other 4kg had to go somewhere. It could have left the scene of the fire in the form of smoke particles and hot gases.

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Definition of transalatory motion

Answers

Translational motion is the motion by which a body shifts from one point in space to another. One example of translational motion is the the motion of a bullet fired from a gun. An object has a rectilinear motion when it moves along a straight line. Hope this helps! :)

Answer:

Translational motion is the motion of body where body moves in the linear path. It is the motion in which all points of a moving body move uniformly in the same line or direction.

A soccer ball is kicked straight upwards with an initial vertical speed of 8.0 m/s. We can ignore air resistance. How long does it take the ball to have a downwards speed of 4.0 m/s?

Answers

Answer:

The time the ball it takes to have the downward speed 4 m/s is 1.22 sec.

Explanation:

Lets explain the motion of the ball

The ball is kicked straight upwards with an initial vertical speed of 8.0 m/s

Its velocity decreases util it reaches the maximum height

At the maximum height its velocity is equal to zero

Then it fall down to the ground

We can ignore air resistance

Lets find the time it takes the ball to reach the maximum height

The acceleration of gravity is -9.8 m/s²

The initial velocity is 8 m/s upward

The final velocity is zero

So lets use the rule v = u + gt, where v is the final velocity, u is the initial

velocity, g is the acceleration of gravity and t is the time

u = 8 , v = 0 , g = -9.8

Substitute these value in the equation above

0 = 8 - 9.8 t

Add 9.8 t for both sides

9.8 t = 8

Divide both sides by 9.8

t = 40/49 seconds

The ball falls withe initial velocity zero and increases to reach 4 m/s

The velocity 4 m/s is downward

The acceleration of gravity is 9.8 m/s²

By using the same rule

u = 0 , v = 4 , g = 9.8

4 = 0 + 9.8 t

4 = 9.8 t

Divide both sides by 9.8

t = 20/49

The time the ball it takes to have the downward speed 4 m/s is the sum

of the two times above

The time the ball it takes = $(40)/(49)+(20)/(49)=(60)/(49)=1.22$ seconds

The time the ball it takes to have the downward speed 4 m/s is 1.22 sec.

Freshwater leeches attach to fish and suck blood from the fish to extend periods of time. This results in sores on the fish that often become infected . This relationship is best described as?

Answers

Answer:

Parasitism.

Explanation:

Parasitism, in biology, is defined as a relationship between different species, formed by a parasite and a host. So, basically the parasite lives in or on the host, causing it harm. Parasites can be describe as predators that eat less than one prey unit, that is, they feed them selves slowly, they don't kill the prey instantly as actual predators do.

So, in this case, we are talking about leeches, which are defined as parasitic worms which lives in freshwater environments. They feed themselves by sucking blood from the host.

Therefore, the relation between these two species is Parasitism.

parasitism i think because they dont feed of dead animals or it would be predation

From this diagram which of the following can you conclude

Answers

Answer: A

Explanation:

I say opposites attract

The answer is A.

Hope this helps :)

Which sphere has a radius of 4 in.? A sphere with volume StartFraction 32 Over 3 EndFraction pi inches cubed. A sphere with volume 36 pi inches cubed. A sphere with volume StartFraction 256 Over 3 EndFraction pi inches cubed. A sphere with volume 288 pi inches cubed.

Answers

Answer: The answer is C

Explanation: I just tried it

Answer:

Explanation:

A basketball has been left out in the cold. The next day you find that it has become soft. What do you do to get it back to shape and why?a) Leave it alone to warm up
b) Pump it up a little
c) Get a new basketball

Answers

All three answers would adequately solve your "flat basketball" problem, but the answer your teacher is probably looking for is a). When the air inside the basketball cooled off, the particles came closer together, causing the ball to deflate. If the air inside the ball was warmed back up, the particles would spread out more (the air would expand) and the ball would inflate again.
Hope that helps!!

The cold made the particles clump to together so the answer could be a or b

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