A student throws a 0.22 kg rock horizontally at 20.0 m/s from 10.0 m above the ground. Find the initial kinetic energy of the rock.
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Ответ:
44J
Explanation:
Given parameters:
Mass of rock = 0.22kg
Initial velocity = 20m/s
Distance moved = 10m
Unknown:
Initial kinetic energy of the rock = ?
Solution:
To solve this problem, we need to understand that kinetic energy is the energy due to the motion of a body.
It is mathematically expressed as;
Kinetic energy =
m v²
m is the mass
v is the velocity
Kinetic energy =
x 0.22 x 20² = 44J
Ответ:
Explanation:
To fit into the standard definition of matter in science, air must have mass and it must take up space. ... Yes, air does have mass and does take up physical space, so, yes, air is made of matter.