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The various long term effects of exercise on cardiovascular system are:
- Increase in the size of heart
- Decrease in resting heart rate
- Stroke volume increase at rest
- Increase in cardiac output
- Increased blood flow
- Decrease in blood pressure
- Increase in blood volume
- Quicker recovery rate
- Reduced risk of heart disease
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Artificial intelligence (AI) is an area of computer science that emphasizes the creation of intelligent machines that work and react like humans. Some of the activities computers with artificial intelligence are designed for include: Speech recognition.
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Gravitational waves stretch and squeeze the fabric of space and time on very minuscule scales; visually exaggerating these effects reveals how Earth is squeezed and stretched. Gravitational waves are generated when massive objects, such as pairs of black holes, accelerate through space and time.
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Preeti Dabral 3 years ago
Bernoulli's principle states that an increase in the speed of a fluid occurs simultaneously with a decrease in static pressure or a decrease in the fluid's potential energy.
To prove Bernoulli's theorem, consider a fluid of negligible viscosity moving with laminar flow. as shown in Figure.
Let the velocity, pressure and area of the fluid cloumn be p1, v1 and A1 at Q and p2, v2 and A2 at R. Let the volume bounded by Q and R move to S and T where QS = L1, and RT = L2
If the fluid is incompressible:
The work done by the pressure difference per unit volume = gain in kinetic energy per unit volume + gain in potential energy per unit volume. Now:
A1L1 = A2L2
Work done is given by:
W = F {tex}\times{/tex} d = p {tex}\times{/tex} volume
{tex}\Rightarrow{/tex} Wnet = p1 - p2
{tex}\Rightarrow{/tex} K.E = {tex}\frac{1}{2}{/tex}mv2 = {tex}\frac{1}{2}{/tex}V {tex}\rho{/tex}v2 = {tex}\frac{1}{2}{/tex}{tex}\rho{/tex}v2 ({tex}\because{/tex} V = 1)
{tex}\Rightarrow{/tex} K.Egained = {tex}\frac{1}{2} \rho\left(v_{2}^{2}-v_{1}^{2}\right){/tex}
P1 + {tex}\frac{1}{2} \rho v_{1}^{2}{/tex} + {tex}\rho{/tex}gh1 = P2 + {tex}\frac{1}{2} \rho v_{2}^{2}{/tex} + {tex}\rho{/tex}gh2
{tex}\therefore{/tex} P + {tex}\frac{1}{2} \rho v^{2}{/tex} + {tex}\rho{/tex}gh = const.
For a horizontal tube
{tex}\because{/tex} h1 = h2
{tex}\therefore{/tex} P + {tex}\frac{1}{2} \rho v^{2}{/tex} = const.
Therefore, this proves Bernoulli's theorem. Here we can see that if there is an increase in velocity there must be a decrease in pressure and vice versa.
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Satyaswarup Nayak 3 years ago
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