Answer:
½mv²=mgh
g=½(V²/h)
Explanation:
When an object is held at a height, it posses gravitational potential energy which is mgh, where m= mass, h=height, g=acceleration due gravity
When the object is dropped, the potential energy will be converted to kinetic energy which is ½mv², where V=velocity at which the object moves.
V=∆h/t, ∆h is change in height with respect to time.
½mv²=mgh
Mass cancel out,
g=v²/2h
This implies that g does not depend or is not affected by mass. Hence heavy object and light object will reach the ground at the same time when dropped from the same height. When air resistance is negligible.
Why is the sun considerad as the main source of energy?
Answer:
The sun is considered as the main source of energy since it is the source of nearly all the earth's energy. Plants produce food using sunlight, and the food we get from plants and animals also has its primary sunlight source.
Hoped it helps you.
Answer:
It is because it supplies most of our energy that we use today, directly or indirectly. It radiates light and heat or solar energy, which makes it possible to exist life on earth.
a hot metal block is placed into 50g of water in an insulated container the water increases in temperature from 20c to 32c the specific heat capacity of water is 4200j/kgk calculate the quantity of heat energy supplied to the water from the metal
Answer:
25,000 joules
given the formula
Q=Mc(final temperature - initial temperature)
M=50 grams convert to kilogram 0.5
c= 4200 j/kg/k
final temperature=32c
initial temperature=20c
A crowbar having the length of 1.75 m is used to balance a load of 500 N. If the distance between the fulcrum and the load is 0.5 m, calculate: (Friction is neglected] i. effort applied to balance the load
ii. MA
iii. VR
iv. efficiency
Answer:
L=load LA=load arm
E=effort EA=effort arm
Complete the table below. Place an X in the appropriate box to
indicate the type of each measurement unit.
Answer:
Gram per centimeter cubed: Derived Unit
Decimeter: SI Unit
Liter: Derived Unit
Meter Cubed: Derived Unit
Kilogram: SI Unit
Explanation:
Look in Quizlet
Can someone please answer this real quick:
Who has the greater velocity, an astronaut who has just completed an orbit of the Earth or you when you have just traveled from home to school? Explain.
Answer:
An astronaut have greater velocity.
A sound wave is sent at the bottom of a sea. If the echo is heard after 2 sec- calculate the depth of the sea. The speed of sound in water is 1500 m/s.
Answer:
3000
Explanation:
Basic kinematics (also probably one of the first formulas in your physics textbook):
Velocity=Distance÷Time
Time=2sec
Velocity=1500 m/s
Distance=??
Rearrange the variables to find the last unknown:
Distance=Velocity×Time
=1500×2
=3000 m
A bicyclist is traveling at +25m/s when he begins to decelerate at -4m/s2. How fast is he traveling after 5 seconds
Answer:
+5m/s
Explanation:
When doing the math we figure out that e is going to be slowing down at -4m/s² for 5 seconds. In total he is slowing down -20m/s which we take from the total speed of +25m/s to get his current new speed.
What do you notice about where the independent and dependent variables are located on each hypothesis above?!
Answer:
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6. What type of stretching would require you to hold a position for a period of time, like doing a split for two minutes and breathing into the pose? h short-term stretching dynamic stretching static-active stretching ballistic stretching
The answer is C: static-active stretching
It is easy to cut curry by a sharp knife,why?
Define upstroke and downstroke?
Answer:
The upstroke is a mechanism that helps to raise the plunger and downstroke helps to help lower the plunger. On the up-stroke of the plunger, the lower valve opens and the upper valve is closed. Whereas, on the downstroke, the lower valve closes and the upper one opens.
đo cường độ dòng điện bằng dụng cụ gì
Answer:
Explanation:
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2246.7 milliseconds to seconds
Answer:
2.2467
Explanation:
Divide the value of time by a thousand
True or false: Venus is the hottest planet
Which of the following statements most accurately differentiates potential and kinetic energy?
A. Kinetic energy is a form of mechanical energy, while gravitational potential energy isn't.
B. Gravitational potential energy is a form of mechanical energy, while kinetic energy isn't.
C. Any object that has motion has potential energy, while any object not in motion but with the potential to do work has kinetic energy.
D. Any object that has motion has kinetic energy, while any object not in motion but with the potential to do work has potential energy.
Answer:
D) Both parts are true.
Hey there, hope my answer helps :)
Answer: D) Any object that has motion has kinetic energy, while any object not in motion but with the potential to do work has potential energy.
When is the pressure of the man on the ground more – lying position or standing position? Explain.
The man on the ground in standing position has more pressure. This is because when he stands, only his legs are in contact with the ground. While lying, his body is more in contact with the ground, therefore, he exerts less pressure.
To the point, a manin standing position on the ground had more pressure.
More is the area of contact, less is the pressure efforted.
Thank you...
4.You decide to flip a coin to determine whether to do your physics or English homework first. The coin is flipped
straight up.
a. What is the velocity of the coin at the top of its trajectory?
b. If the coin reaches a high point of 0.25 m above where you released it, what was its initial speed? c. If you
catch it at the same height as you released it, how much time did it spend in the a
For the coin that is flipped straight up we have:
a. The velocity at the top of its trajectory (at the maximum height) is 0.
b. When it reaches a high point of 0.25 m above where it was released, the initial velocity is 2.21 m/s.
c. The time that the coin spends on the air is 0.44 s.
a. The velocity of the coin at the top of its trajectory is zero because in the maximum height the ball will stop and then will start to move down.
b. When the coin reaches a high point of 0.25 m above where it was released, the initial velocity can be calculated as follows:
[tex] v_{f}^{2} = v_{0}^{2} - 2gh [/tex]
Where:
[tex] v_{f}[/tex]: is the final velocity = 0 (at the maximum height)
[tex] v_{0}[/tex]: is the initial velocity =?
g: is the acceleration due to gravity = 9.81 m/s² (it is negative because its direction is the opposite to the direction of motion of the coin)
h: is the height = 0.25 m
Hence, the initial velocity of the coin is:
[tex] v_{0} = \sqrt{2gh} = \sqrt{2*9.81 m/s^{2}*0.25 m} = 2.21 m/s [/tex]
c. The time that the coin spends on the air is given by the sum of the rise time and the fall time:
Rise time
[tex] t_{s} = -\frac{v_{f} - v_{0}}{g} = -\frac{0 - 2.21 m/s}{9.81 m/s^{2}} = 0.22 s [/tex]
Since the ball is caught at the same height as it was released, the rise time is the same as the fall time, so the total time is:
[tex] t = 0.22 s*2 = 0.44 s [/tex]
Therefore, the coin spend 0.44 seconds in the air.
You can find another example of initial and final velocity here: https://brainly.com/question/13275688?referrer=searchResults
I hope it helps you!
In your own words, provide two examples of scientific data that scientists use to explain how the Big Bang could
have been the birth of the Universe.
Explanation:
One example of how the big bang could have been the birth of the universe is the expansion of it... (Expand on it) (It says in your own words)
Group 2 elements have two valence electrons. Which kind of bond will they most likely form, and why?(1 point)
A covalent bond is likely because they want to share those two valence electrons in order to become stable.
An ionic bond is likely because they will want to give away two valence electrons in order to become stable.
An ionic bond is likely because they are metals and will want to bond with nonmetals.
A metallic bond is likely because they are metals and can bond with other metals.
Answer:
An ionic bond is likely because they will want to give away two valence electrons in order to become stable.
Considering the octet rule and the definition of ionic bond, the correct option is the second option: "An ionic bond is likely because they will want to give away two valence electrons in order to become stable."
Consider first the octet rule, which states that atoms combine or form ions with the goal of obtaining 8 electrons at their last level. In this way, an electronic configuration similar to that of the closest noble gas in the periodic table is reached. This happens because this configuration, of full electronic level, is very stable from the energy point of view
On the other hand, an ionic bond is a type of chemical bond that occurs when one atom gives up an electron to the other, in order for both to achieve electronic stability.
This union normally occurs between metal and nonmetal elements with different electronegativity, which means that the elements have different capacity to attract electrons. In general, metal elements are willing to donate an electron while nonmetals are willing to receive it.
In summary, an ionic bond is produced between metallic and non-metallic atoms, where electrons are completely transferred from one atom to another. During this process, one atom loses electrons and another one gains them, forming ions. Usually, the metal gives up its electrons forming a cation to the nonmetal element, which forms an anion.
Finally, the correct option is the second option: "An ionic bond is likely because they will want to give away two valence electrons in order to become stable."
Learn more:
https://brainly.com/question/12064867?referrer=searchResultshttps://brainly.com/question/5277024?referrer=searchResultsAn automobile starts at rest and accelerates at 3.5 m/s/s after a traffic light turns green. How far will it have gone when it is traveling at 25 m/s?
Please find attached photograph for your answer. Please do comment whether it helped you or not
Which option is a microscopic property that helps determine whether or not two substances will dissolve with each other? (1 point)
volume
polarity
molecular mass
state of matter
Answer:
The answer is polarity
Answer:
B: Polarity
Explanation:
d) All of the
The volume of solid is measured in
a) Litters
b) Grams
c) Cubic centimeters
d) All of the above
a) Liters ... It COULD be. The "Liter" is a perfectly good unit of volume, but it's typically used for liquids and gases, not solids.
b) Grams ... definitely NOT. The "gram" is a unit of mass, not volume.
c) Cubic centimeters ... Yes. This is a unit of volume.
d) All of the above ... No.
The volume of solid is measured in
a) Litters
b) Grams
c) Cubic centimeters
d) All of the above
A bus travels 6km east and then 8km south. The magnitude of the bus’s resultant displacement is _ km
Hey there! Here's your answer:
10 km
Here's why:
The bus's displacement has two components, a number of km and the direction of the final position from the initial position.
The bus's displacement is the hypotenuse of the triangle, 10 km southeast of the initial position.
But southeast is only a rough estimate of the direction.
The tangent of the angle is 6/8 or .75, so the amount of angle to the east of south is 37 degrees.
South (180 degrees) minus 37 degrees is 143 degrees.
The car’s displacement is more accurately called 10 km in a direction of 143 degrees from the initial point.
Have a good day!
write the differences between biomass energy and tidal energy
Answer: Tidal power has potential for future electricity generation.
Explanation: biomass energy-is renewable organic material that comes from plants and animals.
what is inertia? what are the relations between mass and inertia
Answer:
Inertia is the tendency of an object to continue in uniform motion or remain in its state of rest. Mass is a measure of inertia,so the more huge the mass of an object is the more inertia it has.
Inertia is the tendency of an object to resist a change in its motion. Because of inertia, a resting object will remain at rest, and a moving object will keep moving. Objects with greater mass have greater inertia.
Which two elements in the list would bond together based on their ionic charges? (30 points) potassium and iodine potassium and iodine potassium and neon potassium and neon calcium and neon calcium and neon calcium and potassium
Answer: Ionic bonds usually occur between metal and nonmetal ions.
Explanation:
suppose you start with an initial velocity of 10 m/s and have an acceleration of -2m/s. what is your final velocity after 9 seconds?
Please find attached photograph for your answer. Please do comment whether it is useful or not
9. A train is moving with the velocity of 45 km Ihro The osives applies brace and the train gets stopped in 6 second. Now, calculate as distance covered by the train before coming to
the rest.
what is pulley? How does it help in lifting weight?
Hey there!
A pulley is a "system" that has a rope attached to carry heavy materials off the ground. Once you pull the rope, the heavy item will be carried.
Hope this helps!
Have a great day!
A person is pushing a book lying on a table. Identify the different forces that act on
the book and hence mark their directions.
Explanation:
There are two forces acting upon the book. One force - the Earth's gravitational pull - exerts a downward force. The other force - the push of the table on the book (sometimes referred to as a normal force) - pushes upward on the book.
There are mainly 3 forces which acts on a book.
Listed below are the forces and their points:-
• Earth's Gravitational force of attraction- Usually, we may not consider or notice this force, but when a book falls, we understand this, because the book falls due to this gravitational force.
• Force exerted on book while pushing it- While we push a book, we apply Push Force, due to which the book moves on the pushing it on a table.
• Frictional Force- We notice that while pushing a book, it does not continuously move in motion. At a certain distance, this Frictional force increases and therefore, the book comes to a halt.
Location- Opposite of exerted force in all directions