What is the critical mass of a species?
A) the number of individuals that must exist for a species to continue
B) the weight of all representatives of a species
C) the weight of the last representative of a species
Answer:answer is a
Explanation:
Rocks in the Earth's mantle contain a higher percentage of _______ and _______ than do rocks in the Earth's crust.
A- silicon and oxygen
B- iron and silicon
C- iron and magnesium
D- magnesium and oxygen
Look at the diagram below.
Ray 1 from the Sun moves through air and falls on the surface of a lake. Ray 2 is a ray which travels from the surface of the lake at the point Ray 1 strikes the lake, and moves towards air. Ray 1 and Ray 2 make the same angle with the surface of the lake. Ray 1 bends towards the vertical when it enters the lake as Ray 3
(Ik this isn't physic's but its the closest i could find)
Which statement is correct about Ray 1?
A part of it is reflected as Ray 2.
A part of it is reflected as Ray 3.
Some of it is absorbed as Ray 2.
Some of it is absorbed as Ray 3.
Answer:
Some of it is absorbed as Ray 2.
Explanation:
hope this helps!
HELP ME ASAP PLEASE!!!!!!
A chemist begins experimenting with silver and records the following properties:
Silver is a white metal that is an excellent conductor of heat and electricity. Silver tarnishes when exposed to air and light. The density of silver is 10.49 g/cm 3. The melting point is 962 degrees C and the boiling point is 2000 degrees C. Which of the following is NOT a physical property?
density of silver is 10.49 g/cm 3
melting point is 962 degrees C
Silver tarnishes when exposed to air and light
boiling point is 2000 degrees C
Answer:
3. Silver tarnishes when exposed to air and light
Explanation:
Physical properties are properties that change substances in ways that is visible to a human by using their senses (ie. see, touch, etc)
The rest of the answers are chemical properties, which cannot be seen with the human senses, and requires other special devices or techniques to tell.
-Vibilities
Describe characteristics and identify oxidation-reduction(redox) reactions.
plz and thx
Answer:
I hope This helps
Explanation:
The majority of oxidation-reduction (redox) reactions share two critical features. One is that a reduction happens in both, while equivalent oxidation occurs; they are combined.
The oxidation - reduction (redox) reactions has the characteristics of changes in oxygen, hydrogen and electrons.
What are the characteristics and identify oxidation - reduction (redox) reactions?Oxidation is the process during the reaction the reactant loses the electron. Reduction is the process during the reaction, the reactant gains the electron.
Redox reaction can be identified by knowing the number of oxidation. It can also be known through the atoms in this process should be bonded as ionic. During the reaction, the increase in oxidation number can be said as oxidation.
The different types of redox reactions are:
Decomposition reactionDisproportion reactionCombination reactionDisplacement reactionThese are the important characteristics of oxidation and reduction (redox) reactions.
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Compare metamorphic rock and intrusive igneous rock in terms of how and where they form. Then compare sedimentary rock and extrusive igneous rock in terms of how and where they form.
-I need help I only have 13 points and I'll try to give a good amount.
(there is not one that just says science so i chose random subject)
Answer: Igneous rock , formed by the cooling of magma (molten rock) inside the Earth or on the surface. Sedimentary rocks, formed from the products of weathering by cementation or precipitation on the Earth's surface. Metamorphic rocks, formed by temperature and pressure changes inside the Earth.
Explanation:
Given a force of 90 N and a acceleration of 30 m/s/s, what is the object’s mass?
if you traveled 45,000 meters at a velocity of 4.5 m/s how many hours would it take
Show an explanation
Answer:
i dnt knw to be hhonest
Explanation:
Answer:
This better be right You travel 4 miles down a road you get there in 2 hours what is the speed.
Explanation:
Why does the velocity of the ball change when it hits the tree?
Answer:
If a ball is thrown vertically upward from the roof of a 32 ft. tall building with a velocity of 80 ft/sec, it's height in feet after t seconds is s(t)=32+80t-16t^2
Explanation:EEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEE
(Fill in the blanks)For every force there is one that is_____in size but _________in direction.
Answer: For every force there is a reaction force that is equal in size, but opposite in direction.
Hope it helps:)
For every force, there are 2 components one that is equal in size but opposite in direction.
What is force?Force is defined as a cause which is capable of changing the motion of an object. It can cause an object which has mass to change it's velocity. It is also simply a push or a pull . It has both magnitude as well as direction.Hence, it is a vector quantity.
It has SI units of Newton and is represented by'F'.Newton's second law states that force which acts on an object is equal to momentum which changes with time. If mass of object is constant, acceleration is directly proportional to net force acting on an object.
The concepts which related to force are thrust and torque .Thrust increases the velocity of an object and torque produces change in rotational speed of an object.
Learn more about force,here:
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Yall have helped a lot i just need help on this then ill be done for a while
Write a discussion post that contains the following:
Information about the magnetic field from the three websites you used.
What each author believes about the magnetic field.
What you believe about the magnetic field.
Citations for your three websites.
Answer:
f(x)=a(x - h)2 + k
Much like a linear function, k works like b in the slope-intercept formula. Like where add or subtract b would determine where the line crosses, in the linear, k determines the vertex of the parabola. If you're going to go up 2, then you need to add 2.
The h determines the movement horizontally. what you put in h determines if it moves left or right. To adjust this, you need to find the number to make the parentheses equal 0 when x equals -2 (because moving the vertex point to the left means subtraction/negatives):
x - h = 0
-2 - h = 0
-h = 2
h = -2
So the function ends up looking like:
f(x)=a(x - (-2))2 + 2
Subtracting a negative cancels the signs out to make a positive:
f(x)=a(x + 2)2 + 2Explanation:
What is an advantage nuclear power has over solar or wind? *
Nuclear power is cheap.
Nuclear power is reliable.
Nuclear power is clean.
Nuclear power can be built anywhere.
Answer:
it more reliable
Explanation: Nuclear power is 2.5 to 3.5 more reliable than wind and solar
Tires with too much air can explode when overheated. Why? *
The particles in the tire clump together.
The particles in the tire spread out.
The particles of air inside the tire clump together.
The particles of air inside the tire spread out.
Answer:
D. The particles of air inside the tire spread out
Explanation:
science, who ever answers this will get a brainlest
Answer:
divergent boundary
Explanation:
Answer:
Divergent boundaries is the process in which 2 plates are moving apart frm each other.
what does an unconformity in a sequence of rock layers reveal about geologic history?
a. An organism went extinct during that time
b. a layer of rock might have eroded causing a gap in the record
c. the layers of rock cover hundreds of square miles
d. the new rock layers have been deposited very quickly
Explain the impact of objects in space on each other including: (1) the sun on the earth's and (2) the moon on the earth.
Answer: Its from 2. since are taking impact by the meteors.
Explanation: