Answer:
Explanation:
The answer is simple: Gravity. Like all objects, a stream of water also accelerates as it falls. Since the density of water is a constant, and water tends to hold together (cohesion), the only thing that can happen is the narrowing of the stream -- which is exactly what happens.
Answer:
correct option is B
the absolute pressure will be less than 2p
Explanation:
given data
absolute pressure = p
depth = twice
to find out
what is correct option
solution
we know here that p absolute pressure so we consider atmospheric pressure p1
so we can say at some depth h pressure will be
pressure p = p1 + ρ g h
so if depth is double
pressure will be
2p = 2p1 +2 (ρ g h )
so
2p - p1 = p1 + 2 (ρ g h )
so correct option is B
the absolute pressure will be less than 2p
In figure A, The balloon is neutral and the cloth is positive (1+). In figure B, The balloon is negative (3-) and the cloth is positive still (4+)
Answer: B. Nodes
Explanation:
Standing waves (so called because they seem to be immobile) occur when two waves interfere with the same frequency, amplitude but with different direction, along a line with a phase difference of half wavelength.
In these waves there are two types of points:
The <u>nodes</u>, which are points that remain motionless or stationary and do not vibrate. They are <u>due to the destructive interference of both waves when they meet. </u>
The antinodes, which are points that vibrate with a maximum vibration amplitude. They are <u>due to the non-destructive interference of both waves</u>.
Answer:
When the temperature of the gas is increased from 20 to 40, the pressure will be 2p
Explanation:
Given;
initial temperature of the gas, T₁ = 20 K
final temperature of the gas, T₂ = 40 k
initial pressure of the gas, P₁ = P
final pressure of the gas, P₂ = ?
Apply pressure law of gases;
Therefore, when the temperature of the gas is increased from 20 to 40, the pressure will be 2p
