Mechanical advantage = output force/input force
MA = Fo/Fi
Answer: 450J
Explanation:
Mass of ball = 1.0kg
kinetic energy = ?
velocity of the ball = 30m/s
Kinetic energy is the energy possessed by a moving object. It is measured in joules, and depends on the mass (m) of the object and the velocity (v) by which it moves
i.e K.E = 1/2mv²
KE = 1/2 x 1.0kg x (30m/s)^2
KE = 0.5 x 1.0 x 900
KE = 450J
(Recall that kinetic energy is equal to potential energy at the top of its ascent)
So, if KE = 450J; PE = 450J
Thus, the potential energy of the ball is 450 joules.
When the object is at the focal point the angular magnification is 2.94.
Angular magnification:
The ratio of the angle subtended at the eye by the image formed by an optical instrument to that subtended at the eye by the object when not viewed through the instrument.
Here we have to find the angular magnification when the object is at the focal point.
Focal length = 6.00 cm
Formula to calculate angular magnification:
Angular magnification = 25/f
= 25/ 8.5
= 2.94
Therefore the angular magnification of this thin lens is 2.94
To know more about angular magnification refer:: brainly.com/question/28325488
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Aluminium is less dense which is lighter and the cast iron has more dense that's why it's heavier :)