Answer:
t = S / V where S is distance sound travels and V the speed of sound
S = 20 + 20 - v t where v is speed of bat and t time to hear echo
S = 40 - v t
t = (40 - S) / v = (40 - V t) / v substituting S from 1st equation
v t + V t = 40
t = 40 / (v + V) = 40 / (340 + 2) = .117 sec = 117 ms
Answer:
163 N
Explanation:
The density of copper is about 8.96. The ratio of the weight in water to the weight in air is about 1-1/ρ, so is about 0.8884.
0.8884 × 184 N ≈ 163 N
The submerged weight is about 163 N.
The principle of moment can be verified when two known masses are suspended on a uniform meter rule.
<h3>What is principle of moment?</h3>
The principle of moment states that, the sum of clockwise moment is equal to the sum of the anticlockwise moment.
The principle of moment is verified when two known mass (m1 and m2) are suspended on a uniform meter rule.
The clockwise moment will be equal anticlockwise moment of the two masses.
Thus, the principle of moment can be verified when two known masses are suspended on a uniform meter rule.
Learn more about principle of moment here: brainly.com/question/20298772
Answer:
Option e
Explanation:
The Law of Universal Gravitation states that every point mass attracts every other point mass in the universe by a force pointing in a straight line between the centers-of-mass of both points, and this force is proportional to the masses of the objects and inversely proportional to their separation This attractive force always points inward, from one point to the other. The Law applies to all objects with masses, big or small. Two big objects can be considered as point-like masses, if the distance between them is very large compared to their sizes or if they are spherically symmetric. For these cases the mass of each object can be represented as a point mass located at its center-of-mass.
The same force is applied to both the balls.
Opposite to gravity is the normal force. ... The normalforce<span> is always equal in magnitude and opposite in direction to gravity. An </span>object<span> may also have friction</span>acting<span> on it. Friction is a </span>force<span> that occurs when two</span>objects<span> rub against each other, restricting or preventing motion.</span>
