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Preeti Dabral 3 years ago
In spite of all his strength, it now lies imprisoned behind the bars. The tiger pays no attention to the visitors who come to see him every day at the zoo. Instead of this, the tiger Very slowly and silently, moves up and down along the length of the cage without any disturbance in the form of human intervention.
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Preeti Dabral 3 years ago
Structure of Human Heart
- The heart is a muscular organ covered by a double membrane called pericardium.
- The pericardial fluid of the pericardium lubricates the heart.
- The heart is divided into four chambers — two upper atria and two lower ventricles.
- The inter-atrial septum separates the two atria and the inter-ventricular septum separates the two ventricles.
- The atrium and the ventricle of each side are separated by the atrioventricular septum.
- Superior and inferior vena cavae open into the right atrium.
- The right ventricle opens into the pulmonary artery.
- Four pulmonary veins open into the left atrium.
- The left ventricle opens into the aorta.
- The opening between the right atrium and right ventricle is guarded by the tricuspid valve.
- The opening between the left atrium and left ventricle is guarded by the bicuspid (mitral) valve.
- The opening of the right ventricle into the pulmonary artery and the opening of the left ventricle into the aorta is guarded by the semilunar valves.
Working of Heart
- The right atrium receives blood from the upper and lower body through the superior vena cava and the inferior vena cava, respectively, and from the heart muscle itself through the coronary sinus. The right atrium is the larger of the two atria, having very thin walls. The right atrium opens into the right ventricle through the right atrioventricular valve(tricuspid), which only allows the blood to flow from the atria into the ventricle, but not in the reverse direction.
- The right ventricle pumps the blood to the lungs to be reoxygenated.
- The left atrium receives blood from the lungs via the four pulmonary veins. It is smaller than the right atrium but has thicker walls. The valve between the left atrium and the left ventricle, the left atrioventricular valve(bicuspid), is smaller than the tricuspid. It opens into the left ventricle and again is a one-way valve.
- The left ventricle pumps the blood throughout the body through the aorta, which is the largest artery in the body. The walls of the left ventricle are the thickest among all the chambers.
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Preeti Dabral 3 years ago
When a satellite moves around the Earth in a circular path, then the force of gravity acts on it directed towards the centre. The motion of the satellite is in the horizontal plane. Therefore, the force of gravity of Earth on the satellite and the direction of motion of satellite are perpendicular to each other. Therefore, net work done = Fs cos 900 = 0. That is, the work done by the force of gravity on a satellite moving around the Earth is zero.
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Anvi Mehta 3 years ago
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Preeti Dabral 3 years ago
- The electric flux through an area is defined as the electric field multiplied by the area of the surface projected on a plane, perpendicular to the field. Its S.I. unit is voltmeter (Vm) or Newton metre square per coulomb (Nm2 C-1). The given statement is justified because while measuring the flux, the surface area is more important than its volume on its size.
- Electric field inside the shell:
The charge resides on the surface of a conductor. Thus, a hollow charged conductor is equivalent to a charged spherical shell. Let's consider a spherical Gaussian surface of radius (r < R). If E is the electric field inside the shell, then by symmetry electric field strength has the same magnitude Ei on the Gaussian surface and is directed radially outward.
Electric flux through the Gaussian surface is given by,
{tex}=\int_{s} \vec{E}_{i} \cdot d \vec{S}{/tex}
{tex}=\int E_{i} d S \cos 0=E_{i} .4 \pi r^{2}{/tex}
Now, Gaussian surface is inside the given charged shell, so charge enclosed by Gaussian surface is zero.
Therefore, using Gauss's theorem, we have
{tex}\int_{S} \vec{E}_{i} \cdot d \vec{S}=\frac{1}{\epsilon_{0}} \times \text { charge enclosed }{/tex}
{tex}\Rightarrow E_{i} \cdot 4 \pi r^{2}=\frac{1}{\epsilon_{0}} \times 0{/tex}
{tex}\Rightarrow{/tex} Ei = 0
Thus, electric field at each point inside a charged thin spherical shell is zero.
Mayank Chauhan 3 years ago
Posted by Aditya Choudhary 3 years ago
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Preeti Dabral 3 years ago
Characteristics of living things are:-
- Living things breathe.
- Living things need food and water.
- Living things grow.
- Living things reproduce.
- Living things are sensitive.
Maneeth V 2 years, 11 months ago
Posted by Aditya Choudhary 3 years ago
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Preeti Dabral 3 years ago
A plateau is a flat, elevated landform that rises sharply above the surrounding area on at least one side. Plateaus occur on every continent and take up a third of the Earths land. They are one of the four major landforms, along with mountains, plains, and hills.
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Preeti Dabral 3 years ago
No, it is not necessary that all black coloured object should be considered as black bodies. For example , if we take a black surface which is highly polished, it will not behave as a perfect black body .
Posted by Pari Mavi 3 years ago
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Preeti Dabral 3 years ago
No, it is not necessary that all black coloured object should be considered as black bodies. For example , if we take a black surface which is highly polished, it will not behave as a perfect black body .
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