13) State Newton's second law 14) Differentiate convex lens and concave lens. 15)State Boyle's law. 16)What is molar volume of a gas? 17) The aquatic animals lives more in cold region why? 18)What is the respiratory quotient? 19)Why is the sino atrial node is call the pacemaker of the heart
Answers
Answer:
13) Newton's second law: F = ma
It states that the time rate of change of the momentum of a body is equal in both magnitude and direction to the force imposed on it. The momentum of a body is equal to the product of its mass and its velocity.
14) Convex Lens-On passing the light through the lens, it bends the light rays towards each other (i.e., it converges the rays). So due to this, it is called a converging lens.
Concave Lens- On passing the light through the lens, it bends the light rays away from each other (i.e., it diverges the rays). So due to this, it is called a diverging lens.
Convex Lens- A convex lens is thicker at the centre and thinner at the edges.
Concave Lens- A concave lens is thicker at the edges and thinner at the centre.
Convex Lens-Due to the converging rays, it is called a converging lens.
Concave Lens- Due to the converging rays, it is called a converging lens.
Convex Lens- Use for correction of long-sightedness.
Concave Lens-Use for correction of short-sightedness.
15) Boyle's law states that at constant temperature, the pressure exerted by a gas is inversely proportional to the volume occupied by it. In other words we can say, volume and pressure are inversely proportional to each other but only at constant temperature and constant mass of gas.
16) The molar volume of a gas expresses the volume occupied by 1 mole of that respective gas under certain temperature and pressure conditions. ... 0.5 moles⋅22.4 L/mol=11.2 L , and so on.
17)Aquatic animals are more comfortable in cold water than in warm water. This is because the solubility of oxygen in water increases with decrease in temperature. The amount of dissolved oxygen per unit volume is more for cold water than for warm water.
18)Respiratory quotient, also known as the respiratory ratio (RQ), is defined as the volume of carbon dioxide released over the volume of oxygen absorbed during respiration. It is a dimensionless number used in a calculation for basal metabolic rate when estimated from carbon dioxide production to oxygen absorption.01-Oct-2018
19) The cells of the SA node at the top of the heart are known as the pacemaker of the heart because the rate at which these cells send out electrical signals determines the rate at which the entire heart beats (heart rate). The normal heart rate at rest ranges between 60 and 100 beats per minute.
Answer:
13.Newton's second law: F = ma
It states that the time rate of change of the momentum of a body is equal in both magnitude and direction to the force imposed on it. The momentum of a body is equal to the product of its mass and its velocity
14.A convex lens is thicker at the centre and thinner at the edges. A concave lens is thicker at the edges and thinner at the centre. Due to the converging rays, it is called a converging lens. Due to the diverging rays, it is called a diverging lens.
15.Boyle's law—named for Robert Boyle—states that, at constant temperature, the pressure P of a gas varies inversely with its volume V, or PV = k, where k is a constant. ... Though this law describes the behaviour of an ideal gas, it closely approximates the behaviour of real gases.
16.Aquatic animals are more comfortable in cold water than in warm water. This is because the solubility of oxygen in water increases with decrease in temperature. The amount of dissolved oxygen per unit volume is more for cold water than for warm water.
17.Respiratory quotient, also known as the respiratory ratio (RQ), is defined as the volume of carbon dioxide released over the volume of oxygen absorbed during respiration. It is a dimensionless number used in a calculation for basal metabolic rate when estimated from carbon dioxide production to oxygen
19.The cells of the SA node at the top of the heart are known as the pacemaker of the heart because the rate at which these cells send out electrical signals determines the rate at which the entire heart beats (heart rate).