PHYSICS MIDDLE SCHOOL

Which organelle appears to be empty but is filled with liquid? A.cell membrane B.chloroplast C.vacuole D.ribosome. Help ASAP PLEASE

Answers

Answer 1
Answer: hey i learned this last week while we were making cell cakes its  c.vacuole
Answer 2
Answer: An organelle that appears to be empty but is filled with liquid is vacuole. So the answer is C because vacuole stores water and plant substances.

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Why some air masses are cool, cold, warm, and hot as well as moist or dry?

Answers

Answer:

Explanation:

Often times, the property of air masses is a function of where they originate from especially with respect to latitude.

An air mass is certain amount of air with some unique set of temperature and vapor component.

  • Air masses differs from places to places based on where  they originate.
  • Continental air masses are usually dry and cold because there is little to no water on a land mass.
  • Air masses that originates from the surface of the ocean are predominantly moist.
  • In polar regions, the air mass is cold.
  • Around the tropics, they are usually warm due to insolation here.

Answer:

very an explainfull question try again with another type of question

Explanation:

Where do people and animals get energy to move arond

Answers

People and animals get energy to move arond in the food they eat.

What is the formula for kinetic energy?

Answers

Kinetic Energy = 1/2 (mass) (speed squared)
k.e.=1/2m v^2

hope this helps

How are Newton’s second and third laws of motion important to your everyday life?

Answers

Well, first off, Newtons second law of motion deals with the motion of accelerating and decelerating objects.
 We already know that from everyday life examples such as simply pushing a car that if 2 people push a car on a flat road it will accelerate faster than if one person was pushing it... Therefore, there is a relationship between the size of the force and the acceleration.  
 Now onto the third law of motion. First of all, what is the third law of motion? Well, a force is a push or a pull that acts upon an object as a results of its interaction with another object. Forces result from interactions! According to Newtons third law, whenever one object, and another object interact with each other, they exert forces upon each other. "For every action, there is an equal and opposite reaction."  The statement means that in every interaction, there is a pair of forces acting on the two interacting objects. So, how is this important to everyday life you may ask? 
Well, the action-reaction force pairs are found everywhere in your body.
 For example, right now as I am typing, my tendons are exerting forces on bones, and those bones exert reaction forces on the tendons, as muscles contract, pulling my fingers on the keys. I press on those keys, and they press back on my fingers. See? Since im pressing on the keys, the press back on me. Its opposite from eachother, as stated in the quite above. "For every action, there is an equal and opposite reaction." 
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 ~I hope this helped :)

Figure 1.18 (Chapter 1) shows the Hoover Dam Bridge overthe Colorado River at a height of 271 m. If a heavy object is
dropped from the bridge, how much time passes before the
object makes a splash?

Answers

Answer: 7.436 s

Explanation:

This situation is related to vertical motion, specifically free fall and can be modelled by the following equation:

y=y_(o)+V_(o) t+(gt^(2))/(2)  

Where:

y= 0m is the final height of the object (when it makes splash)

y_(o)=271 m  is the initial height of the object

V_(o)=0 m/s  is the initial velocity of the object (it was dropped)

g=-9.8m/s^(2)  is the acceleration due gravity (directed downwards)

t is the time since the objecct is dropped until it makes splash

0=y_(o)+0+(gt^(2))/(2)  

Clearing t:

t=\sqrt{(-2y_(o))/(g)}  

t=\sqrt{(-2(271 m))/(-9.8m/s^(2))}  

Finally:

t=7.436 s  

What type of reaction occurs when you strike a match?

Answers

The type of reaction is combustion 

I'm probably wrong, but friction?
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