Answer:
I HAD THE SAME QUESTION AND SEARCHED IT UP AND GOT THE ANSWERS.
Explanation:
In 1630 at the beginning of European settlement, about 425,000,000 hectares of the United States were covered with trees. By 2017, the area covered by trees was reduced to 300,000,000 hectares. What is the percentage decrease in the area covered by trees between 1630 and 2017?
Answer:
29.41%
Explanation:
Given that,
In 1630 at the beginning of European settlement, about 425,000,000 hectares of the United States were covered with trees.
By 2017, the area covered by trees was reduced to 300,000,000 hectares.
We need to find the percentage decrease in the area covered by trees between 1630 and 2017.
The percentage decrease in any value is given by :
[tex]\%=\dfrac{300,000,000 -425,000,000 }{425,000,000 }\times 100\\\\=29.41\%[/tex]
So, the percentage decrease in the area covered by the trees is 29.41%.
Deanna's niece loves to swing at the local playground, so Deanna takes her and pushes her on the swing. Deanna must use (motion / transfer / force / energy) to exert a (transfer / motion / force / energy) that causes the swing to change (force / energy / motion / transfer/position).
AnswerShe uses force and air
Explanation:
n bhvygvg gv
How can magnets cause objects to have kinetic energy?
Answer:
this has to do with the drop in voltage, or potential as electrons traverse the material .
A car moving round a circular racing track takes 120s to do a lap of 8km what is the speed in km/hr.
Answer:
Solution in photo
Explanation:
A car moves around in a circular racing track, and it takes 120 seconds to do a lap of 8 km, so the speed in km/hr is 239.76 km/hr.
What is Speed?The speed of an object, commonly known as v in mechanics, is a scalar quantity that corresponds towards the size of the change in that object's position over duration or the size of the change in that object's position per unit of time.
The instantaneous velocity is the absolute maximum of the average speed as the time interval's duration gets closer to zero. The cruising pace of an object in a time interval is calculated by dividing its distance traveled by the time interval's duration. Velocity and speed are different concepts.
The given data according to the question is,
Time, t = 120 s
Distance, d = 8 km
s = 8/120
s =0.0666 km/sec or
s = 0.0666/1s × 3600
s = 239.76 km/hr.
Therefore, the speed is 239.76 km/hr.
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Why do you need to learn about Volcanoes?
Answer:
Without volcanoes, most of Earth's water would still be trapped in the crust and mantle . Early volcanic eruptions led to the Earth's second atmosphere, which led to Earth's modern atmosphere . Besides water and air, volcanoes are responsible for land, another necessity for many life forms .
Explanation:
I hope it helpsplz help asap 3 problums i will give brailyest
Which would take more work: lifting a 4 N box 0.5 m or a 1 N box 4 m? Explain your answer.
Sheleah does 1500 J worth of work on a 250 N box. How far does she have to move the box?
A 400 kg box and a 200 kg are to pushed across a horizontal table, the exact same distance with the exact force. Which box will have the most work done on it? Which box will get to the end first? Explain both of your responses.
Answer:
the answer is 104568948 degress
Explanation:
yeeeeeee
A 58 kg skier starts at rest from a 24.0 m high hill. They travel to the bottom and then up a second hill to a height of 19.0 m. How much kinetic energy do they have at the top of the second hill?
Answer:
10.791 kJ
Explanation:
Given that,
Mass of the skier, m = 58 kg
Initial position, h₁ = 24 m
Final position, h₂ = 19 m
We need to find the kinetic energy do they have at the top of the second hill.
Using the conservation of energy for both positions.
[tex]v_1=\sqrt{2gh_1} \\\\=\sqrt{2\times 9.8\times 24} \\\\=21.68\ m/s[/tex]
And
[tex]v_2=\sqrt{2gh_2} \\\\=\sqrt{2\times 9.8\times 19} \\\\=19.29\ m/s[/tex]
Kinetic energy :
[tex]K=\dfrac{1}{2}mv_2^2\\\\K=\dfrac{1}{2}\times 58\times 19.29^2\\\\=10791.01 J\\\\=10.791\ kJ[/tex]
So, the kinetic energy they have at the top of the second hill is 10.791 kJ.
In your own words explain how acceleration differs from uniform motion.
Explanation:
acceleration is the Changing of throut per unit time ....
and in uniform motion .....
in that the speed of an object is uniform means same
What is always true about the light ray that emerges from the right side of the lens?
A Force that does not change an object velocity
Answer:
I think ur wrong to say force doesn't change an object velocity
Explanation:
Force affects how objects move. They change the direction of motion of an object that is already moving. Since force causes a change in the speed or direction of an object, we may say that force causes changes in an object velocity.
Science help please!
Answer:
104 N
Explanation:
m = 1300 kg
a = 0.08m/s^2
F = 1300*0.08
F = 104 N
Newtons is the unit of force.
If the body's temperature is above 105 °F for a prolonged period, heat stroke
can result. Express this temperature on the Celsius scale.
OA 40.5°C
OB 58.3°C
OC 76.1°C
KOD 131.4°C
Answer:
A
Explanation:
C = (F-32)*5/9 = 73*5/9 = 40.55555
since the answers are spread apart, technically you can just estimate by doing -32
and then /2
since 5/9 is close to 1/2
What units would you use to measure a red blood cell ? (nanometers micrometers millimeters
Unit to measure red blood cell is million per cubic millimeter
What is red blood cell ?A red blood cell, also called a hematopoietic cell, hemocyte, is a cell produced through hematopoiesis and found mainly in the blood
Unit to measure red blood cell is million per cubic millimeter
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Tyler is in downtown San Antonio entertaining the tourists with amazing feats of physics. He carries a nickel
(mass of 5.0 grams) up to the top of the Tower of the Americas and places it on the edge of the observation
deck, a height of 124 meters. Tyler pushes the nickel off the edge of the Tower, and then tells the tourists
that he will be able to calculate the velocity of the nickel just before it hits the ground. What will be the
nickel's velocity?
Answer:
The velocity of the nickel just before it hits the ground is approximately 49.3 m/s
Explanation:
In order to calculate the velocity of the nickel just before it hits the ground, we recall the kinematic equation of motion, v² = u² + 2·g·h, where the variables of the equation are defined as follows;
v = The velocity of the nickel just before it hits the ground after it is pushed off the observation deck
u = The initial velocity of the nickel just before it is pushed off the observation deck = 0 m/s
g = The acceleration due to gravity = 9.8 m/s²
h = The height from which he nickel is pushed off the edge = 124 m
Substituting the given values and the constant, "g", we have;
v² = 0² + 2 × 9.8 × 124 = 2,430.4
v = √2,430.4
Using a graphing calculator, we have;
v = √2,430.4 = 14·√(62/5) ≈ 49.3
The velocity of the nickel just before it hits the ground = v ≈ 49.3 m/s.
Plants appear green because they do not absorb the green wavelengths of light. What happens to those green light waves when they hit a plant? The are diffracted. They are absorbed. They are reflected. They are refracted.
Answer:
They are reflected.
Explanation:
Red light is absorbed while green light is reflected, causing the color to be green in human eyes.
Answer:
C
Explanation:
What is the average speed of this car over the entire journey ?
Answer: 0.83333333333 km/h
Explanation: give brainliest
A boy pulls his toy on a smooth horizontal surface with a rope inclined at 60 degree to the horizontal if the effective force pulling the toy along the horizontal surface is 5 Newton calculate the tension in the rope
Answer:
Tension = 2.5 N
Explanation:
Given:
Angle = 60°
Force f = 5 N
Find:
Tension
Computation:
Tension = fcosθ
Tension = (5)cos60
Tension = (5)(1/2)
Tension = 2.5 N
A sailboat sits tied up at the dock.
Which forces are acting on it?
(A)
applied force and tension force
(B)
electrical force and applied force
(C)
gravity and electrical force
(D)
tension force and gravity
Answer:B
Explanation:i think so im not suree
A sailboat that is tied up at the dock will experience tension force and gravity. Therefore, option (D) is correct.
What is the tension force?Tension can be described as a force acting along the flexible length of a medium such as a rope, string, or cable, or a force carried by a flexible medium.
Tension can be defined as an action-reaction pair acting at each end of the elements. For a rope, tension is present in every section of the rope or string in both directions, apart from their endpoints. Each endpoint of the rope will experience tension and force from the weight attached to it.
Tension can also be defined as a pulling force but the tension is not a pushing force. Ropes or strings are used to exert forces since they transfer a force over a specific distance.
Therefore, sailboats experience the tension force due to the rope with which it is tied at the dock and the force due to gravity.
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What does anaerobic mean?
A. Short bursts of energy
B. Without oxygen
C. Intense physical output
D. With oxygen
Answer:
without oxygen because
Answer:
Without oxygen
Explanation:
What causes the electrons to move in the “Electromagnetic Induction” animation?
a.
Current
c.
Changes in magnetic field
b.
Voltage
d.
Kinetic energy
Please select the best answer from the choices provided
A
B
C
D
Answer:
Change in the magnetic field
Which graph accurately shows the relationship between kinetic energy and mass as mass increases
Answer:
c
Explanation:
energy doesnt affect to mass of a object
Intact fossils are usually found in sedimentary rock, not metamorphic rock. Based on the information in the diagram, what is the reason for this phenomenon?
Explanation:
The reason for this phenomenon is the due to the condition by which each type of rocks form.
A sedimentary rock is formed by the compaction and lithification of sediments within a basin.
A metamorphic rock forms under high temperature and pressure conditions which alters the minerology of a rock.
Based on these conditions, the metamorphic rock cannot host any fossil. Any relics of fossils would be destroyed at such elevated pressure and temperature conditions. This is not so in a sedimentary rock because the conditions are similar to that which can preserve organic matter.Answer:
The heat and pressure of metamorphism would deform the fossil, and the process of melting would destroy the fossil completely.
Explanation:
PLATO
Which of the following is an example of work: bowling or reading?
Answer:
bowling
Explanation:
bowling is an example of work because it involves hand movement.
An object decelerates from 25.0 m / s to 5.0 m / s in a time of 4.0 s. It has a mass of 50 kg. What is the resultant force on the object?
Answer:
10 N
Explanation:
Force = Mass÷Acceleration
F= 50 ÷ 5
= 10 N
______________________
Acceleration =
[tex] \frac{5 - 25}{4 } [/tex]
= 5m/s2
Given:
Mass, m = 50 kgAcceleration, a = 5.0 m/sTime, t = 4.0 sAs we know,
The acceleration will be:
= [tex]\frac{5-25}{4}[/tex]
= [tex]5 \ m/s^2[/tex]
hence,
The force will be:
→ [tex]F = \frac{m}{a}[/tex]
By substituting the values, we get
[tex]= \frac{50}{5}[/tex]
[tex]= 10 \ N[/tex]
Thus the above response is right.
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Name one process that requires a force in the human body. Hint: the question is asking about something happening inside of the body like muscle contractions.
Answer:
Movement
Explanation:
Please Help Me!!!........
Answer:
B
Polar covalent bonds and van dar Waals forces are weak attractive forces between discrete molecules of a simple molecular structure.
Ionic bonds are strong electrostatic forces of attraction between oppositely charged ions.
Hydrogen bonds are very strong bonds between hydrogen and a highly electronegative atom e.g Oxygen, fluorine, nitrogen
Please Help Me!!!!!!
Answer:
..
Charcoal is flammable.
why is the sun regarded as a big thermonuclear furnace?
plz tell
Answer:
hope this answers will help you
Explanation:
If you find it appropriate then plz mark as brainliest
How much distance does a car travel if it is driving down the road at 50 m/s before hitting
the gas and accelerating at 3 m/s2 for 20 seconds?
Answer:
from second equation of motion
[tex]S = ut + \frac{1}{2} a {t}^{2} \\ S = (50 \times 20) + (\frac{1}{2} \times 3 \times {20}^{2} ) \\ S = 1000 + 600 \\ S = 1600 \: m[/tex]
a 50 kg box is pushed to the left using 500 N, the frictional force on the box is 100 N what is the acceleration on the box?
First thing's first, we need to find the Net Force of the system in order to solve for acceleration. Gravity and Normal Force cancel out, so we don't really have to worry about anything on the y-axis. However, looking at the x-axis, we see two forces: the Force of the push and Frictional Force.
This means that:
[tex]F_{net}[/tex] = 500 - 100
[tex]F_{net}[/tex] = 400 (N)
Recall that Force = Mass * Acceleration. Since we have the Force and Mass, we can easily solve for Accel:
F = ma
a = [tex]\frac{F}{m}[/tex]
Plug the net force and mass into the equation:
a = [tex]\frac{F}{m}[/tex]
a = [tex]\frac{400}{50}[/tex]
a = 8 (m/[tex]s^{2}[/tex])
The box's acceleration is 8 m/[tex]s^{2}[/tex]
If you have any questions about how I got to the answer, just ask :)