A runner runs for some distance before taking a long jump because the inertia of his body helps him cover more distance during the jump; option [C]. Running increases the momentum of his body, enabling him to generate more force and velocity, which translates into greater distance during the jump. TRead more
A runner runs for some distance before taking a long jump because the inertia of his body helps him cover more distance during the jump; option [C]. Running increases the momentum of his body, enabling him to generate more force and velocity, which translates into greater distance during the jump. Therefore, the correct option is [C] While jumping, the inertia of his body helps him to cover more distance. This strategy is commonly employed in long jump events to maximize the distance achieved, utilizing the momentum gained from running to propel the body further through the air during the jump. It optimizes the athlete’s performance by harnessing the principles of physics, specifically inertia, to enhance the effectiveness of the jump and achieve greater distances.
When two stones of different masses are dropped simultaneously from the top of a building, both stones reach the ground together; option [C]. This phenomenon occurs due to the absence of significant air resistance, and according to the principle of universal gravitation, all objects fall at the sameRead more
When two stones of different masses are dropped simultaneously from the top of a building, both stones reach the ground together; option [C]. This phenomenon occurs due to the absence of significant air resistance, and according to the principle of universal gravitation, all objects fall at the same rate regardless of their mass. Therefore, neither the smaller nor the larger stone reaches the ground before the other. The composition of the stone does not affect this outcome. This concept is a fundamental principle in physics known as the equivalence principle, which states that in a vacuum, all objects experience the same acceleration due to gravity regardless of their mass. Thus, the correct option is [C] Both the stones reach the ground together, illustrating a fundamental aspect of gravitational physics.
Mercury has the lowest density among the listed liquids; option [D]. Mercury's density is approximately 13.6 grams per cubic centimeter (g/cm³), making it much denser than the other options. Clean water typically has a density around 1 g/cm³, while salty water, which contains dissolved salts, may haRead more
Mercury has the lowest density among the listed liquids; option [D]. Mercury’s density is approximately 13.6 grams per cubic centimeter (g/cm³), making it much denser than the other options. Clean water typically has a density around 1 g/cm³, while salty water, which contains dissolved salts, may have a slightly higher density due to the added solutes. Petrol, a liquid hydrocarbon mixture used as fuel, has a density generally lower than water but higher than mercury. However, even petrol’s density is significantly higher than that of mercury. Mercury’s low density is attributed to its atomic structure, consisting of relatively large and heavy atoms closely packed together. This density difference is why mercury sinks when mixed with water, as water has a lower density. Therefore, when comparing the densities of clean water, salty water, petrol, and mercury, mercury has the lowest density, making it unique among the options provided. Thus, the correct option is [D] Mercury.
Bernoulli's theorem is based on energy conservation; option [B]. It states that in a flowing fluid, the total mechanical energy per unit mass remains constant along a streamline. This principle describes the relationship between fluid velocity, pressure, and elevation and is fundamental in fluid dynRead more
Bernoulli’s theorem is based on energy conservation; option [B]. It states that in a flowing fluid, the total mechanical energy per unit mass remains constant along a streamline. This principle describes the relationship between fluid velocity, pressure, and elevation and is fundamental in fluid dynamics, aerodynamics, and hydrodynamics. Bernoulli’s theorem helps analyze fluid flow in various engineering applications, including aircraft design, pipe flow, and hydraulic systems. It is derived from the conservation of energy principle, where the total energy of a system remains constant unless acted upon by external forces. Therefore, the correct option is [B] Energy conservation, elucidating the foundational principle upon which Bernoulli’s theorem is based.
An iron needle floats on the surface of water due to surface tension; option [B]. Surface tension arises from the cohesive forces between water molecules, particularly at the water-air interface. This cohesion creates a thin film on the water's surface with higher tension than the bulk of the liquidRead more
An iron needle floats on the surface of water due to surface tension; option [B]. Surface tension arises from the cohesive forces between water molecules, particularly at the water-air interface. This cohesion creates a thin film on the water’s surface with higher tension than the bulk of the liquid. The surface tension acts like a “skin,” supporting lightweight objects such as the iron needle, allowing it to float. Unlike other materials, the iron needle’s density is higher than that of water, so it would typically sink. However, the strong surface tension of water counteracts the needle’s weight, effectively “holding it up” on the water’s surface. This phenomenon is observed in various contexts, from small insects walking on water to certain lightweight objects floating. Therefore, the correct option is [B] Due to surface tension, as it is the cohesive force at the water’s surface that enables the iron needle to float rather than sink.
A runner runs for some distance before taking a long jump, because
A runner runs for some distance before taking a long jump because the inertia of his body helps him cover more distance during the jump; option [C]. Running increases the momentum of his body, enabling him to generate more force and velocity, which translates into greater distance during the jump. TRead more
A runner runs for some distance before taking a long jump because the inertia of his body helps him cover more distance during the jump; option [C]. Running increases the momentum of his body, enabling him to generate more force and velocity, which translates into greater distance during the jump. Therefore, the correct option is [C] While jumping, the inertia of his body helps him to cover more distance. This strategy is commonly employed in long jump events to maximize the distance achieved, utilizing the momentum gained from running to propel the body further through the air during the jump. It optimizes the athlete’s performance by harnessing the principles of physics, specifically inertia, to enhance the effectiveness of the jump and achieve greater distances.
See lessTwo stones of different masses are dropped simultaneously from the top of a building
When two stones of different masses are dropped simultaneously from the top of a building, both stones reach the ground together; option [C]. This phenomenon occurs due to the absence of significant air resistance, and according to the principle of universal gravitation, all objects fall at the sameRead more
When two stones of different masses are dropped simultaneously from the top of a building, both stones reach the ground together; option [C]. This phenomenon occurs due to the absence of significant air resistance, and according to the principle of universal gravitation, all objects fall at the same rate regardless of their mass. Therefore, neither the smaller nor the larger stone reaches the ground before the other. The composition of the stone does not affect this outcome. This concept is a fundamental principle in physics known as the equivalence principle, which states that in a vacuum, all objects experience the same acceleration due to gravity regardless of their mass. Thus, the correct option is [C] Both the stones reach the ground together, illustrating a fundamental aspect of gravitational physics.
See lessWhich of the following liquids has the lowest density?
Mercury has the lowest density among the listed liquids; option [D]. Mercury's density is approximately 13.6 grams per cubic centimeter (g/cm³), making it much denser than the other options. Clean water typically has a density around 1 g/cm³, while salty water, which contains dissolved salts, may haRead more
Mercury has the lowest density among the listed liquids; option [D]. Mercury’s density is approximately 13.6 grams per cubic centimeter (g/cm³), making it much denser than the other options. Clean water typically has a density around 1 g/cm³, while salty water, which contains dissolved salts, may have a slightly higher density due to the added solutes. Petrol, a liquid hydrocarbon mixture used as fuel, has a density generally lower than water but higher than mercury. However, even petrol’s density is significantly higher than that of mercury. Mercury’s low density is attributed to its atomic structure, consisting of relatively large and heavy atoms closely packed together. This density difference is why mercury sinks when mixed with water, as water has a lower density. Therefore, when comparing the densities of clean water, salty water, petrol, and mercury, mercury has the lowest density, making it unique among the options provided. Thus, the correct option is [D] Mercury.
See lessBernoulli’s theorem is based on
Bernoulli's theorem is based on energy conservation; option [B]. It states that in a flowing fluid, the total mechanical energy per unit mass remains constant along a streamline. This principle describes the relationship between fluid velocity, pressure, and elevation and is fundamental in fluid dynRead more
Bernoulli’s theorem is based on energy conservation; option [B]. It states that in a flowing fluid, the total mechanical energy per unit mass remains constant along a streamline. This principle describes the relationship between fluid velocity, pressure, and elevation and is fundamental in fluid dynamics, aerodynamics, and hydrodynamics. Bernoulli’s theorem helps analyze fluid flow in various engineering applications, including aircraft design, pipe flow, and hydraulic systems. It is derived from the conservation of energy principle, where the total energy of a system remains constant unless acted upon by external forces. Therefore, the correct option is [B] Energy conservation, elucidating the foundational principle upon which Bernoulli’s theorem is based.
See lessWhy does an iron needle float on the surface of water?
An iron needle floats on the surface of water due to surface tension; option [B]. Surface tension arises from the cohesive forces between water molecules, particularly at the water-air interface. This cohesion creates a thin film on the water's surface with higher tension than the bulk of the liquidRead more
An iron needle floats on the surface of water due to surface tension; option [B]. Surface tension arises from the cohesive forces between water molecules, particularly at the water-air interface. This cohesion creates a thin film on the water’s surface with higher tension than the bulk of the liquid. The surface tension acts like a “skin,” supporting lightweight objects such as the iron needle, allowing it to float. Unlike other materials, the iron needle’s density is higher than that of water, so it would typically sink. However, the strong surface tension of water counteracts the needle’s weight, effectively “holding it up” on the water’s surface. This phenomenon is observed in various contexts, from small insects walking on water to certain lightweight objects floating. Therefore, the correct option is [B] Due to surface tension, as it is the cohesive force at the water’s surface that enables the iron needle to float rather than sink.
See less