What is projectile motion
2 answers:
If an object is given an initial velocity in any direction and then allowed to travel freely under gravity only, it is called a projectile motion.
It is basically 3 types
- horizontally projectile motion
- oblique projectile motion
- included plane projectile motion
The path followed by a projectile is called its trajectory.
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Answer:
The apparent depth of (a) the fish is 5.3 cm and (b) the image of the fish is 24.8 cm.
Explanation:
According to the following equation:
where <em>nw</em> and <em>na</em> is the refractive indices of water (1.33) and air (1.00) respectively; <em>s</em> is the depth of the fish below the surface of the water; s' is the apparent depth of the fish from normal incidence and Rc is the radius of curvature of the mirror at the bottom of the tank.
Note that the bottom of the tank is assumed to be a flat mirror, therefore the radius of curvature is very large (R⇒∞).
Therefore, the above equation can be expressed as:
Now we can solve for the apparent depth of the fish.
(a) (Make s' subject of the formula from the above equation)
∴
(b) The motionless fish floats 13 cm above the mirror, therefore the image of the fish will be situated at 13 + 20 =33 cm away from the real fish.
Therefore, s = 33 cm
NB: Here, it is assumed that the water is pure, as impurities may alter the refractive index of water.
Answer:
2.1J
Explanation:
Given parameters:
Spring constant = 128N/m
Compression = 0.18m
Unknown:
Potential energy of the spring = ?
Solution
The potential energy of the spring is the elastic potential energy within the spring.
To solve this;
Elastic potential energy = k e²
k is the spring constant
e is the compression
Now;
Elastic potential energy = x 128 x 0.18² = 2.1J