A “K-9 cannon” uses a powerful rubber band to launch a tennis ball(mass of 0.0577 kg) vertically upwards. The tennis ball has a
1 answer:
Answer:
t = 5.1[s]
Explanation:
To solve this problem we must first use the following equation of kinematics.
where:
Vf = final velocity = 0
Vo = initial velocity = 25 [m/s]
g = gravity acceleration = 9.81 [m/s²]
t = time [s]
Now replacing:
Note: The key to understand this problem is that when the tennis ball is in the highest position its velocity is zero.
So it will take the same time from the highest point to the ground
t = 2.54 +2.54
t = 5.09 [s]
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The image formed from the lens is real, inverted and enlarged
Explanation:
The magnification of a lens is given by:
(1)
where:
y' is the size of the image
y is the size of the object
q is the distance of the image from the lens
p is the distance of the object from the lens
For this lens, the magnification is
m = -1.6
We notice the following:
- The magnification is negative
- The magnification is larger than 1
Looking at eq.(1), we can therefore make the following conclusions:
- SInce and
, it follows that
, so the image is larger than the object
- Since and
, it follows that
(since y > 0 for convention): this means that the image is inverted
- Since and
, it follows that
(since p > 0 for convention): this means that the image is real
Learn more about lenses and mirrors here:
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