✯ Answer the following questions in one to four sentences:-
↬ What will happen to the gravitational force between two bodies if the masses of one body is doubled ?
↬ Define the standard kilogram.
↬ What keeps the moon in uniform circular motion around the earth ?
↬ When does an object show weightlessness ?
↬ What is a fluid ?
↬ What is specific gravity of a substance ?
↬ The relative density of a body is 2. Will is sink or float in water ? Give reason for your answer.
↬What do you mean by thurst ?
Answers
Answer:
↬ Since the gravitational force is directly proportional to the mass of both interacting objects, more massive objects will attract each other with a greater gravitational force.
↬ The kilogram (kg) — the fundamental unit of mass in the International System of Units (SI) — was defined as exactly equal to the mass of a small polished cylinder, cast in 1879 of platinum and iridium.
↬ Gravitational attraction provides the centripetal force needed to keep planets in orbit around the Sun and all types of satellite in orbit around the Earth. The Earth's gravity keeps the Moon orbiting us. It keeps changing the direction of the Moon's velocity.
↬ Weightlessness is a state when an object does not weigh anything. It occurs only when a body is in a state of free fall under the effect of gravity alone.
↬ Fluid, any liquid or gas or generally any material that cannot sustain a tangential, or shearing, force when at rest and that undergoes a continuous change in shape when subjected to such a stress.
↬ Specific gravity is defined as the ratio of the density of the solid part of a material to the density of water at 20°C. Typically, the specific gravity of soils is in the range 2.60 to about 2.80.
↬ The relative density(RD) is greater than 1. therefore the object will sink in water. As , the density of object is more than water it'll sink. It will sink, as the RD of the fluid in which the body is placed is less than the RD of the body.
↬ Force exerted by an object perpendicular to the surface is called thrust. Pressure: Pressure is defined as thrust or force per unit area on a surface. SI unit of pressure is called Pascal (Pa).
Explanation:
✯ Hope it helps uh!!
✯ Thank my answers!!
Explanation:
↬ What will happen to the gravitational force between two bodies if the masses of one body is doubled ?
➷ If the mass of one body is doubled, force is also doubled.
↬ Define the standard kilogram.
➷ The standard kilogram is the mass of a block of a platinum alloy kept at the international bureau of weights and measures near Pasis in France.
↬ What keeps the moon in uniform circular motion around the earth ?
➷ Gravitational force between moon and the earth keeps moon in uniform circular motion around the earth.
↬ What keeps the moon in uniform circular motion around the earth ?
➷ Weightlessness is a state when an object does not weigh anything. It occurs only when a body is in a state of free fall under the effect of gravity alone.
↬ What is a fluid ?
➷ A substance which has no shop of it's own but takes the shape of the vessel containing it, is called a fluid.
↬ What is specific gravity of a substance ?
➷ Specific gravity of a substance is defined as the ratio of density of a substance to the density of water (for solids and liquids) and hydrogen (for gases).
↬ The relative density of a body is 2. Will is sink or float in water ? Give reason for your answer.
➷ The relative density of a body is 2. It is greater than relative density of water. Hence it will sink because it means that upward thurst of water is less than the weight of the body.
↬What do you mean by thrust ?
➷ Thrust is the force acting on a body perpendicular to its surface. It has the unit of force. The S.I unit of thrust is newton (N). Effect of thrust depends upon the area over which it acts.