If a ball has a mass of 5 kg and 100 J of KE, what is its velocity?
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Mass of ball=m=5kgKinetic energy=KE=100JVelocity=v=?We know
[tex]\boxed{\sf K.E=\dfrac{1}{2}mv^2}[/tex]
[tex]\\ \sf\longmapsto 100J=\dfrac{1}{2}5\times v^2[/tex]
[tex]\\ \sf\longmapsto v^2=100\times \dfrac{2}{5}[/tex]
[tex]\\ \sf\longmapsto v^2=20(2)[/tex]
[tex]\\ \sf\longmapsto v^2=40[/tex]
[tex]\\ \sf\longmapsto v=\sqrt{40}[/tex]
[tex]\\ \sf\longmapsto v=6.2m/s[/tex]
Answer:
6.2m/s
Explanation:
an athlete had lifts a load with a mass of 150kg.
1) calculate the gravitational potential energy gained
2) if the mass of the load is increased to 200kg, calculate the gravitational potential energy gained by the load.
3) based on answers in 1&2, state the relationship between the mass of the load and the gravitational potential energy.
[tex]\\ \sf\longmapsto P.E=mgh[/tex]
[tex]\\ \sf\longmapsto P.E=150(2)(10)[/tex]
[tex]\\ \sf\longmapsto P.E=3000J[/tex]
In 2nd case
Mass =m=200kgHeight=h=2mg=10m/s^2[tex]\\ \sf\longmapsto P.E=200(2)(10)[/tex]
[tex]\\ \sf\longmapsto P.E=4000J[/tex]
We can observe that
If mass of body increases gravitational potential energy will increase._______ is the surest test which confirms that the given piece of the object is a magnet.
1.Rotation
2.Repulsion
3.None of these
4.Refraction
Answer:
2. Repulsion
Explanation:
number two is the answer
Answer:
Repulsion is the surest test which confirms that the given piece of the object is a magnet.
........
Which of the following is a combustion reaction?
O A. 2503 (9)
->
2502 (9) + 02 (9)
O B. 2Na (s) + Cl2 (9) → 2NaCl (s)
C. C3H8 (g) + 502 (9) — 3C02 (9) + 4H20 (9)
O D. 2KCIO3 (s) — 2KCI (s) + 303 (9)
Answer:
Option C
Explanation:
Hydrocarbon + Oxygen = Carbon dioxide + Water
is example of combustion reaction
A city bus travels along its route from Jackson Street 8 km to Aurora Avenue, where it turns and continues 13 km.
What is the total distance that the bus has traveled? km
The total displacement of the bus is approximately 15 km northeast northwest southeast southwest.
im a bit confused on what the question is:(
if its just asking for the total number of km traveled it would be 21 km
Ag,Au and Cu are called coinage metals why plzzzz hurry its urgent plzzz
Answer:
This is because these metals are used for minting (making) coins.
Answer:
It is bcz it is used for making coins
How many meters are in 10 miles?
Answer:
Explanation:
16093.4
3. Take sugar, oil, corn syrup, a glass and water. Pour the water in the glass and then add each of the above the substances one after the other. Observe and note your observations. And give reason for your observation.
Here are the observations
Sugar:-
Sugar is soluble in water so It will dissolve in water .Corn syrup:-
Corn syrup is also basically a sugar.It will dissolve in water too .If we shake the mixture in glass then corn syrup will be dissolved.Oil:-
Oil is not soluble in waterHence it won't dissolve in water.It will float over water and make two layers3. Calculate the wavelength of wave that has a frequency of 4.75 x 1012Hz.
a. 1.43 x 1021 m
b. 6.31 x 105 m
1.58 x 104 m
d. 6.31 x 105 m
please help
C.
We know
[tex]\boxed{\sf \lambda=\dfrac{C}{V}}[/tex]
[tex]\\ \sf\longmapsto \lambda=\dfrac{3\times 10^8ms^{-1}}{4.75\times 10^{12}s^{-1}}[/tex]
[tex]\\ \sf\longmapsto \lambda=0.631\times 10^{-4}m[/tex]
[tex]\\ \sf\longmapsto \lambda=6.31\times 10^{-5}m[/tex]
Lò xo là gì? Tác dụng của lò xo
Answer:
Lò xo (từ tiếng Pháp: ressort) là các vật thể đàn hồi được sử dụng trong các hệ thống cơ học. Lò xo được phân thành hai loại:
biến dạng theo ý muốn
có lực đàn hồi theo ý muốn
lực kế, cân trọng lượng... trong khoa đo lường.
giảm xóc xe cộ
phát âm (chuông, loa phóng thanh...)
lưu trữ năng lượng (dây cót đồng hồ)
công tắc điện.
bám giữ vật (kẹp quần áo)
bút bi.
7. Two billiard balls of equal mass, one blue and the other red, slide towards each other at 2.0m/s in opposite
directions towards each other. They collide head on and rebound both at 1.8m/s in opposite to their original
velocities,a s shown in the diagram below. Show how momentum is conserved in this collision.
Answer:
P = M V expresses momentum
Both before and after collision the momenta are equal and in opposite directions. So the the total momentum is zero both before and after the collision. P is a vector quantity as is the velocity. Total momentum must be zero.
Density of an object can be found by calculating mass divided by volume. If two objects have the same mass, but one has a greater volume, the object with more volume is less dense. Does water’s density change when it is frozen?
Answer:
yes, the density of ice is less than the density of water. Ice floats on water.
Explanation:
7. You are using a Bunsen burner to heat a chemical. You need your notebook, which is on the other side of the flame.
Accident:
Prevention:
Accident: Get burned
Prevention: turn off the burner.
Why does the value of g is move at polar region than at equator
Explanation:
the centrifugal force of the Earth's rotation forces the Earth's belly at the equator to grow even further. that extra material/mass is pulled in from the poles.
so, from equator to equator there is more mass and more gravity than from pole to pole.
what is velocity ratio ?
Answer:
the ratio of a distance through which any part of a machine moves to that which the driving part moves during the same time.pls pls mark me branilest
If river flowing at 9km/h,how to find boats velocity?
Answer:
Flow rate and velocity are related by Q=A¯v where A is the cross-sectional area of the flow and v is its average velocity.
A substance freezes at 25 degree celcius and boils at450 degree celcius at what temperature will the subsancehave a definate shape and a defnate volume
Answer:
solid
Explanation:
I really don't know
Answer:
In Sections 1.3 and 2.5A3, we noted that the physical properites of a particular substance determine its state at room temperature. If both its normal melting point and its normal boiling point are below room temperature (20°C), the substance is a gas under normal conditions. The normal melting point of oxygen is -218°C; its normal boiling point is -189°C. Oxygen is a gas at room temperature. If the normal melting point of a substance is below room temperature, the substance is a liquid at room temperature. Benzene melts at 6°C and boils at 80°C; it is a liquid at room temperature. If both the normal melting point and the normal boiling point are above room temperature, the substance is a solid. Sodium chloride melts at 801°C and boils at 1413°C. Sodium chloride is a solid under normal conditions. Figure 9.1 illustrates the relationship between physical state and normal melting and boiling points.
A variable is a letter that stands in for a number and unit... True or False?
State Ohms law in easy words
Answer:
Ohm's law states that the current through a conductor between two points is directly proportional to the voltage across the two points.
A carnot engine has an efficiency of 50% when its sink temperature is 27°C. The temperature of source is: a) 300°C b) 327°C c) 273°C d) 373°C
327 degrees
Have a great day!
Give reason Pascal is a derived unit
Answer:
Pascal is a derived unit because it cannot be expressed in any physics terms, but it is an expression of fundamental quantities.
Explanation:
[tex]{ \sf{Pasacal \: ( Pa) = \frac{newtons}{metres {}^{2} } }} \\ \\ { \sf{Pasacal \: (Pa) = \frac{kg \times {ms}^{ - 2} }{ {m}^{2} } }}[/tex]
write two ways to be protected from the energy crisis?
Mass of the sun is 2x10³⁰ kg and that of the earth is 6/10²⁴ kg and the distance between them is 1.5 x 10¹¹m. What is the gravitational force produced between them?
Answer:
The gravitational force is 3.56 × 10^22 N
Explanation:
[tex]{ \bf{force = \frac{GM_{s} m _{e}}{ {r}^{2} } }}[/tex]
[tex]{ \sf{force = \frac{6.67 \times {10}^{ - 11} \times (2 \times {10}^{30} ) \times (6\times {10}^{24}) }{(1.5 \times {10}^{11}) {}^{2} } }} \\ \\ { \sf{force = 3.56 \times {10}^{22} \: newtons}}[/tex]
what is the relationship between electrostatic force and electric field?
5. a. Answer the following questions. What is density? Write a formula by showing the relation among density mass and volume.
Answer:
Density is how compact something is. The relationship is M/V=D (Mass divided by Volume equals Density).
Explanation:
WHAT IS DENSITY:
Density is the degree of compactness of a substance.
EXAMPLE:
"a reduction in bone density"
FORMULA OF DENSITY:
The formula for density is d = M/V, where d is density, M is mass, and V is volume.
help please .....
what is the effect of gravity on a falling object? write the conclusion obtained from the coin and feather experiment ?
Answer:
Pick something up with your hand and drop it. When you release it from your hand, its speed is zero. On the way down its speed increases. The longer it falls the faster it travels. Sounds like acceleration to me.
But acceleration is more than just increasing speed. Pick up this same object and toss it vertically into the air. On the way up its speed will decrease until it stops and reverses direction. Decreasing speed is also considered acceleration.
But acceleration is more than just changing speed. Pick up your battered object and launch it one last time. This time throw it horizontally and notice how its horizontal velocity gradually becomes more and more vertical. Since acceleration is the rate of change of velocity with time and velocity is a vector quantity, this change in direction is also considered acceleration.
In each of these examples the acceleration was the result of gravity. Your object was accelerating because gravity was pulling it down. Even the object tossed straight up is falling — and it begins falling the minute it leaves your hand. If it wasn't, it would have continued moving away from you in a straight line. This is the acceleration due to gravity.
In this initial experiment the bowling ball drops straight to the ground whereas the feathers float, owing to air resistance.
He alludes to the earlier experiment by Galileo that tested the same hypothesis.
"Galileo’s experiment was simple," he explains. "He took a heavy object, and a light one, and dropped them at the same time to see which fell fastest."
Although Galileo’s experiment proved two similarly shaped objects would fall at the same speed despite being different weights, he didn’t have access to a vacuum chamber in the 17th Century to conduct Professor Cox's more extravagant experiment.
Professor Cox also used the bowling ball and feather to prove a hypothesis put forward by Albert Einstein.
His Special Theory of Relativity argued that items would not be falling but standing still due to lack of force acting on them.
"Isaac Newton would say that the ball and the feather fall because there’s a force pulling them down: gravity,’ Professor Cox said.
"But Einstein imagined the scene very differently.
"The “happiest thought of his life” [as Einstein called it] was this; the reason the bowling ball and the feather fall together is because they’re not falling.
"They’re standing still. There is no force acting on them at all.
"He reasoned that if you couldn’t see the background, there’d be no way of knowing that the ball and the feathers were being accelerated towards the Earth.
"So he concluded they weren’t."
The tweaking of Newton’s earlier theory enabled Einstein to more accurately define his own theory, which regards the relationship between space and time.
hope it helps you
Describe manipulated Variable
please do ittt I really need it
Answer:
ok bro
Explanation:
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Logam P dan Q sejenis. Logam P yang memiliki panjang 1 meter dipanaskan hingga mengalami kenaikan suhu 12ºC, akibatnya logam bertambah panjang 0,2 cm. Logam Q juga dipanaskan hingga mengalami kenaikan suhu 10°C dan panjangnya bertambah 0,1 cm. Tentukanlah panjang mula-mula logam Q!
Answer:
I don't know ???
sorry
One possible unit of speed is
Answer:
option d
Explanation:
Meter per second
