A tennis ball is dropped from 1.43 m above theground. It rebounds to a height of 0.945 m.
With what velocity does it hit the ground?
The acceleration of gravity is 9.8 m/s
2. (Let
down be negative.)
Answer in units of m/s
(This I already know -5.29 but I just don't know how to continue and do the rest of the parts)
Part 2
With what velocity does it leave the ground?
Answer in units of m/s.
Part 3
If the tennis ball were in contact with the
ground for 0.00638 s, find the acceleration
given to the tennis ball by the ground.
Answer in units of m/s
2.
Answers
Answer:
Part 2: 4.30 m/s
Part 3: 1503 m/s^2
Explanation:
First you already had -5.29 m/s
Part 2
With what velocity does it leave the ground ?
it is the same process as question 1, but in this case the height is 0.945 m
Part 3
This is a simple formula of :
Final speed: is the speed the ball leaves the ground = 4.30 m/s
Initial speed: is the speed the ball hits the ground = -5.29 m/s
4.30 - (-5.29) = 0.00638a
a = 1503 m/s^2
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A submarine is 46 m below sea level, and it descends 24 m. How far below sea level is it? a. The submarine is 70 m below sea level. b. The submarine is 46 m below sea level. c. The submarine is 24 m below sea level. d. The submarine is 94 m below sea level.
The speed of light is closest to 300,000
Answers
Answer:
the range or the ball is 48.81 m
Explanation:
given;
Nicole throws a ball at 25 m/s at an angle of 60 degrees abound the horizontal.
find:
What is the range of the ball?
solution:
let Ф = 25°
Vo = 25 m/s
consider x-motion using time of fight: x = Vox * t
where x = R = range
t = 2 Voy
g
R = Vo² sin (2Ф)
g
plugin values into the formula:
R = (25)² sin (2*25)
9.81
R = 48.81 m
therefore, the range or the ball is 48.81 m
4.8miliseconds broooo.
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Extra info related to the question :-
What is a rationlising factor ?
If the product of two irrational numbers is a rational number then each of the the two is rationalising factor of the other.
What is the purpose of rationilising the denominator ?
If the denominator of a fraction is irrational it is somewhat difficult to locate the fraction on number line. So, to make it easy we need to rationalise the denominator.
How to rationalise the denominator ?
1) Consider the denominator of the fraction.
2) Then multiply the numerator and denominator with rationalising factor of the denominator.
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Answers
(100 joule/sec) x (60 sec) = 6,000 joules.
B. protostar.
C. red giant.
D. nebula.
Answers
Nebula is the cloud of interstellar dust and gas that forms a star. It is collborately shaped during colliding and collapsing of the interstellar mediums this is influenced by the gravitational attraction of the atoms and particles in the entites. Hence, there are three types of nebular namely, are classical nebula, diffuse nebula, planetary nebular and supernova remnants.
Answers
Answer:
As per faraday's law the rate of change in magnetic flux linked with a coil will induce EMF in the coil. It is given by
now here as we are closing the switch and then open it alternatively so it will change the value of current in the coil.
This change in current will change the magnetic flux in the coil due to which it will induce EMF in it.
Now by Lenz the the direction of induce current in the coil will always opposite to the causes due to which it is induced.
As we know that when switch is connected to flow the current the direction of induced current is in opposite to the current so that it will oppose the increasing value of current while when we open the switch the induced current is in direction of the current so that it will increase the value of decreasing current in the loop.
The induced emf is in the direction opposite to the direction of current.
What is induced emf?
Emf is the production of a potential difference in a coil as a result of changes in the magnetic flux passing through it.
When the flux coupling with a conductor or coil changes, electromotive Force, or EMF, is said to be induced.
The rate of change in magnetic flux linked to a coil will induce EMF in the coil, according to Faraday's law.
Now, when we alternately close and open the switch, the current in the coil will change.The magnetic flux in the coil will vary as a result of the change in current, resulting in EMF in the coil.
Now, according to Lenz, the direction of induce current in the coil will always be the polar opposite of the causes.
Hence the induced emf is in the direction opposite to the direction of current.
To learn more about the induced emf, refer to the link;
#SPJ2
b. 440 V
c. 4,160 V
d. 69,000 V
Answers
Answer:
c. 4,160 V
Explanation:
Primary distribution voltage by electric utility company are often distributed around 3 Kv to 35 Kv, which would be a range between 3,000 V to 35,000 V because in order to be consumed by the public they use transformers to lower the voltage to less than 1Kv this can be used in domestic usage, so form the options the one that most likely would be used as a primary distribution voltage is 4,160 V.
♡♡Hope I helped!!! :)♡♡
B. A warm and dry day with a wind moving in the opposite direction as the sound
C. A cold and dry day with a wind moving in the same direction as the sound
D. A cold and humid day with no wind
Answers
Sound waves travel through a medium such as solid, liquid, or gas. It travels faster when the molecules of its medium are closer together. This is the reason why it travels the slowest through dry air. When air is wet or humid, sound can travel faster because sound travels faster through water.
When sound waves pass through air, the most important factor that affects it is temperature. The higher the temperature, the faster the molecules vibrate. This allows sound waves to travel faster.
The answer is A. A warm and humid day with a wind moving in the same direction as the sound. hope this helps!!!!