PHYSICS MIDDLE SCHOOL

What type of rock forms when rocks melt, cool, and then harden?Igneous
Metamorphic
Shale
Sedimentary

Answers

Answer 1
Answer: Igneous rocks form when melted
Answer 2
Answer:

Igneous rocks (1st option) are formed when the rocks melt, cool & then harden. Their formation takes place over a long period of time.

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The upward force on an object falling through the air is?

Answers

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what is another name for the cluster of the cells that attach the walls of the uterus fertilization?.......and......how does the mother provide the developing fetus with food and oxygen?......plzzz help

Answers

In a nutshell...
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(please show work)A rock is dropped off of a cliff. It falls to the ground in 10 seconds. Answer the following questions assuming that there is no air resistance.


c. What is the instantaneous velocity of the rock just before it hit the ground?


d.Find the rock's displacement for the 10 seconds.​

Answers

c. -98 m/s

The motion of the rock is a uniformly accelerated motion (free fall) with constant acceleration g=-9.8 m/s^2 (negative since it is downward). Therefore, we  can find its velocity using the following suvat equation

v=u+gt

where

v is the final velocity

u is the initial velocity

g is the acceleration of gravity

t is the time

For the rock in the problem,

u = 0

So, its velocity at t = 10 s is

v=0+(-9.8)(10)=-98 m/s

where the negative sign indicates that the velocity points downward.

d. -490 m

Since the motion is at constant acceleration, we can use another suvat equation:

s=ut+(1)/(2)gt^2

where

s is the displacement

u is the initial velocity

g is the acceleration of gravity

t is the time

Substituting:

u = 0

g=-9.8 m/s^2

t = 10 s

We find the rock's displacement:

s=0+(1)/(2)(-9.8)(10)^2=-490 m

where the negative sign means the displacement is downward.

Answer fast, please.

Answers

D bomb b j de violence

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Answers

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Answers

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