Answer:
u=78.4m/s
Explanation:
A ball is thrown vertically upward, which is the positive direction.A little later it returns to its point of release.The ball is in the air for a total time of 8.0 s.What is its initial velocity? Neglect air resistance
from newtons equation of motion
s=ut
v=u+at
v=0 because at maximum height reached by the ball the ball stops moving
0=u-9.8*8
u=78.4m/s
u=initial velocity
v=final velocity
a=acceleration due to gravity, 9.81m/s^2
t=time it takes in air
s= distance to get to the maximum before returning
The correct answer to the question is : D) Ultraviolet rays, because they are moderate energy and abundant.
EXPLANATION;
Before going to answer this question, first we have to know the nature of electromagnetic waves.
As per electromagnetic spectrum, the gamma wave has more frequency as compared to other electromagnetic waves. After gamma wave, X-rays come. Hence, gamma ray and X-ray are more energetic as compared to others, and more harmful. They are not safe.
Radio wave has the least frequency in the periodic table. Hence, it has less energy.It is also less harmful as compared to other electromagnetic waves.
As per the option, the radio wave has high energy which is wrong.
Ultraviolet rays have moderate energy. It is harmful but not so much like X-rays and gamma rays. It is abundant as it is coming from sun.
Hence, the proper answer of this question is ultraviolet rays.
-- The amplitude of Wave-1 is greater than the amplitude of Wave-2 ...
possibly 3 or 4 times as great.
-- The wavelength of Wave-1 is longer than the wavelength of Wave-2 ...
maybe almost twice as long.
-- The frequency of Wave-2 is greater than the frequency of Wave-1 ...
maybe almost twice as frequent.
Define electric potential and electric potential energy.
Describe the relationship between potential difference and electrical potential energy.
Explain electron volt and its usage in submicroscopic process.
Determine electric potential energy given potential difference and amount of charge.
Answer:
B and D
Explanation
Gravitational potential energy does not relate to graphs and it is about a moving object so b and d would not be correct