Four of the types of electromagnetic waves are microwaves,radio waves, infreqd waves, and visible light waves which has the most
1 answer:
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Answer:
option (a) 0.61 s
Explanation:
Given;
Time taken by the ball to reach the ground = 0.50 s
Let us first calculate the distance through which the ball falls on the ground
from the Newton's equation of motion, we have
where,
s is the distance
a is the acceleration
t is the time
here it is the case of free fall
thus, a = g = acceleration due to gravity
u = initial speed of the ball = 0
on substituting the values, we get
or
s = 1.225 m
Now,
when the elevator is moving up with speed of 1.0 m/s
the initial speed of the ball = -1.0 m/s (as the elevator is moving in upward direction)
thus , we have
or
or
4.9t^2 - t - 1.225 = 0
or
t = 0.612 s
hence, the correct answer is option (a) 0.61 s
Answer:
D. 550 Hz
Explanation:
Frequency for string is given by
where v is the speed of the wave, L = m is the length
Frequency is inversely proportional to the Length of the string
from above relation we can write
The newly shortened string has 4/5 the length of the full string .i,e
Hence option D is correct