Answer:
0.4 s
Explanation:
The time that the ball is in the air can be found with the next formula:
where 
is the initial velocity of the ball, in this case:
β is the angle: β = 29.0°
And g is the acceleration of gravity: 
Replacing all the values to find t, we have:
Thus, the ball is 0.4s in the air.
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Answer:
A friend snorkeling just below the surface of the water along the same shore will detect the sound first.
Explanation:
- The speed of sound in water medium is faster than that through the air.
- Sound propagates through the medium by transferring through the molecules on it. Water has more closely packed molecules due to which the speed is faster.
- In fact, the sound's speed in water is almost four times faster than that in the air.
- So the guy in the water surface gets to hear sound faster than the one in sore.
Answer:
f = 1 m
Explanation:
The magnification of the lens is given by the formula:
where,
M = Magnification = 4
q = image distance = 5 m
p = object distance = ?
Therefore,
Now using thin lens formula:
<u>f = 1 m</u>
