<span>When water freezes to form ice, its volume expands. However, we know from conservation of mass that the mass of the ice is the same as the mass of the water. Since density is defined fundamentally as mass / volume, and we have an expanding volume at a constant mass, the denominator of the equation grows, and thus the density of ice is lower than that of liquid water.</span>
Answer:
The objective lens is an optical tool used to focus an image.
Explanation:
The objective lens is an optical tool that collects light emitted by an object under observation and focuses the rays of light in order to form a real and magnified image They are used in optical instruments like microscopes, cameras, telescopes, etc. and are also referred as objective or object glasses.
Answer:
The instantaneous velocity of the object is 250 m/s
Explanation:
Given;
time of the object motion, t = 25 s
acceleration due to gravity, g = 10 m/s²
The instantaneous velocity of the object is given as;
v = u + gt
where;
u is the initial velocity of the object = 0 (since it was released from rest)
Substitute the givens;
v = 0 + (10 x 25)
v = 250 m/s
Therefore, the instantaneous velocity of the object is 250 m/s
