When detergent is added to pure water, the surface tension decreases; option [B]. Detergent molecules contain both hydrophilic and hydrophobic components. The hydrophilic part interacts with water molecules, while the hydrophobic part disrupts the cohesive forces between water molecules at the surfaRead more
When detergent is added to pure water, the surface tension decreases; option [B]. Detergent molecules contain both hydrophilic and hydrophobic components. The hydrophilic part interacts with water molecules, while the hydrophobic part disrupts the cohesive forces between water molecules at the surface. As a result, the surface tension of the water decreases, allowing the detergent solution to spread more easily over surfaces and penetrate materials for effective cleaning. This reduction in surface tension enhances the detergent’s ability to wet surfaces and lift away dirt and grease. Consequently, adding detergent to water improves its cleaning properties compared to pure water alone. This phenomenon is widely utilized in various applications, from household cleaning to industrial processes, where reducing surface tension is essential for achieving thorough and efficient cleaning results.
Small pieces of camphor dance on the surface of water primarily due to surface tension; option [A]. When camphor is placed on water, it quickly sublimes, transitioning from a solid to a gas phase. This sublimation releases camphor molecules into the surrounding air. As these molecules diffuse outwarRead more
Small pieces of camphor dance on the surface of water primarily due to surface tension; option [A]. When camphor is placed on water, it quickly sublimes, transitioning from a solid to a gas phase. This sublimation releases camphor molecules into the surrounding air. As these molecules diffuse outward, they create a localized concentration gradient at the water’s surface.
Surface tension, a property of liquids arising from cohesive forces between molecules, causes the water’s surface to behave like a thin elastic film. When the camphor molecules diffuse to the water’s surface, they disrupt this surface tension, creating regions of lower surface tension around them.
Consequently, the surface tension exerts a force on the camphor pieces, causing them to move in a direction away from the region of higher surface tension. This movement is akin to a boat propelled by the release of air bubbles underwater. As a result, the camphor pieces appear to “dance” or move chaotically on the water’s surface.
While camphor does have certain properties that contribute to its behavior on water, such as its low solubility and volatility, it is primarily the interaction between camphor molecules and the surface tension of water that causes the dancing motion.
A person at rest in the middle of a horizontal plane of perfectly smooth ice can bring themselves to the shore by utilizing the first law of motion, also known as the law of inertia; option [A]. This law states that an object at rest will remain at rest unless acted upon by an external force. In thiRead more
A person at rest in the middle of a horizontal plane of perfectly smooth ice can bring themselves to the shore by utilizing the first law of motion, also known as the law of inertia; option [A]. This law states that an object at rest will remain at rest unless acted upon by an external force. In this scenario, the person can initiate motion towards the shore by exerting a force against the ice in the opposite direction. By pushing against the ice with their feet or by using some other means, the person applies a force that overcomes the inertia of their own body, causing them to move towards the shore.
While the second law of motion relates force, mass, and acceleration, and the third law of motion describes action and reaction forces, these laws are not directly applicable in this context. The first law, however, specifically addresses the tendency of objects to remain at rest or in uniform motion unless acted upon by an external force, making it the relevant principle for the person’s movement on the smooth ice.
When the child throws the ball straight up in the air while inside a car moving at a constant speed, the motion of the ball is influenced by both the initial velocity imparted by the child and the uniform motion of the car. Since the car is moving with a constant velocity, there are no additional foRead more
When the child throws the ball straight up in the air while inside a car moving at a constant speed, the motion of the ball is influenced by both the initial velocity imparted by the child and the uniform motion of the car. Since the car is moving with a constant velocity, there are no additional forces acting on the ball while it is in the air relative to the car. Therefore, the ball follows a simple parabolic trajectory, going vertically upwards due to the initial throw and then falling downwards, relative to the car’s frame of reference; option [C].
Since the ball has no horizontal motion relative to the car, it remains directly above the child throughout its flight. As a result, when it descends, it falls back into the hands of the child, assuming the child’s hands remain in the same position throughout the motion. This is because both the child and the ball are moving at the same velocity horizontally, so there’s no relative motion between them in the horizontal direction. Consequently, the correct option is [C] in his hand, as the ball returns to the child’s hand due to the absence of any external horizontal forces acting on it within the car’s frame of reference.
The hairs of the shaving brush stick together when taken out of water primarily due to surface tension; option [A]. Surface tension arises from cohesive forces between water molecules, causing them to attract each other. When the shaving brush is submerged in water, water molecules adhere to the haiRead more
The hairs of the shaving brush stick together when taken out of water primarily due to surface tension; option [A]. Surface tension arises from cohesive forces between water molecules, causing them to attract each other. When the shaving brush is submerged in water, water molecules adhere to the hairs and create a thin film on their surface. Upon removal from water, the cohesive forces between the water molecules cause them to cling together, resulting in the hairs sticking together.
While viscosity, elasticity, and friction play roles in various phenomena, they are not the primary reasons for the hairs of the shaving brush sticking together. Viscosity refers to a fluid’s resistance to flow and does not directly affect the hairs of the brush. Elasticity pertains to the ability of a material to return to its original shape after deformation and is not relevant to the sticking of the hairs. Friction is the resistance encountered when one object slides over another, but it is not the dominant factor in this scenario.
Understanding the role of surface tension elucidates why the hairs of the shaving brush tend to stick together when removed from water, a phenomenon commonly observed in daily grooming routines.
When detergent is added to pure water, the surface tension
When detergent is added to pure water, the surface tension decreases; option [B]. Detergent molecules contain both hydrophilic and hydrophobic components. The hydrophilic part interacts with water molecules, while the hydrophobic part disrupts the cohesive forces between water molecules at the surfaRead more
When detergent is added to pure water, the surface tension decreases; option [B]. Detergent molecules contain both hydrophilic and hydrophobic components. The hydrophilic part interacts with water molecules, while the hydrophobic part disrupts the cohesive forces between water molecules at the surface. As a result, the surface tension of the water decreases, allowing the detergent solution to spread more easily over surfaces and penetrate materials for effective cleaning. This reduction in surface tension enhances the detergent’s ability to wet surfaces and lift away dirt and grease. Consequently, adding detergent to water improves its cleaning properties compared to pure water alone. This phenomenon is widely utilized in various applications, from household cleaning to industrial processes, where reducing surface tension is essential for achieving thorough and efficient cleaning results.
See lessWhy do small pieces of camphor dance on the surface of water?
Small pieces of camphor dance on the surface of water primarily due to surface tension; option [A]. When camphor is placed on water, it quickly sublimes, transitioning from a solid to a gas phase. This sublimation releases camphor molecules into the surrounding air. As these molecules diffuse outwarRead more
Small pieces of camphor dance on the surface of water primarily due to surface tension; option [A]. When camphor is placed on water, it quickly sublimes, transitioning from a solid to a gas phase. This sublimation releases camphor molecules into the surrounding air. As these molecules diffuse outward, they create a localized concentration gradient at the water’s surface.
See lessSurface tension, a property of liquids arising from cohesive forces between molecules, causes the water’s surface to behave like a thin elastic film. When the camphor molecules diffuse to the water’s surface, they disrupt this surface tension, creating regions of lower surface tension around them.
Consequently, the surface tension exerts a force on the camphor pieces, causing them to move in a direction away from the region of higher surface tension. This movement is akin to a boat propelled by the release of air bubbles underwater. As a result, the camphor pieces appear to “dance” or move chaotically on the water’s surface.
While camphor does have certain properties that contribute to its behavior on water, such as its low solubility and volatility, it is primarily the interaction between camphor molecules and the surface tension of water that causes the dancing motion.
A person is at rest in the middle of a horizontal plane of perfectly smooth ice. By using which law of Newton can he bring himself to the shore?
A person at rest in the middle of a horizontal plane of perfectly smooth ice can bring themselves to the shore by utilizing the first law of motion, also known as the law of inertia; option [A]. This law states that an object at rest will remain at rest unless acted upon by an external force. In thiRead more
A person at rest in the middle of a horizontal plane of perfectly smooth ice can bring themselves to the shore by utilizing the first law of motion, also known as the law of inertia; option [A]. This law states that an object at rest will remain at rest unless acted upon by an external force. In this scenario, the person can initiate motion towards the shore by exerting a force against the ice in the opposite direction. By pushing against the ice with their feet or by using some other means, the person applies a force that overcomes the inertia of their own body, causing them to move towards the shore.
While the second law of motion relates force, mass, and acceleration, and the third law of motion describes action and reaction forces, these laws are not directly applicable in this context. The first law, however, specifically addresses the tendency of objects to remain at rest or in uniform motion unless acted upon by an external force, making it the relevant principle for the person’s movement on the smooth ice.
See lessA child sitting in an open car going at a constant speed throws a ball straight up in the air. The ball falls
When the child throws the ball straight up in the air while inside a car moving at a constant speed, the motion of the ball is influenced by both the initial velocity imparted by the child and the uniform motion of the car. Since the car is moving with a constant velocity, there are no additional foRead more
When the child throws the ball straight up in the air while inside a car moving at a constant speed, the motion of the ball is influenced by both the initial velocity imparted by the child and the uniform motion of the car. Since the car is moving with a constant velocity, there are no additional forces acting on the ball while it is in the air relative to the car. Therefore, the ball follows a simple parabolic trajectory, going vertically upwards due to the initial throw and then falling downwards, relative to the car’s frame of reference; option [C].
See lessSince the ball has no horizontal motion relative to the car, it remains directly above the child throughout its flight. As a result, when it descends, it falls back into the hands of the child, assuming the child’s hands remain in the same position throughout the motion. This is because both the child and the ball are moving at the same velocity horizontally, so there’s no relative motion between them in the horizontal direction. Consequently, the correct option is [C] in his hand, as the ball returns to the child’s hand due to the absence of any external horizontal forces acting on it within the car’s frame of reference.
The hairs of the shaving brush stick together when taken out of water. The reason for this is
The hairs of the shaving brush stick together when taken out of water primarily due to surface tension; option [A]. Surface tension arises from cohesive forces between water molecules, causing them to attract each other. When the shaving brush is submerged in water, water molecules adhere to the haiRead more
The hairs of the shaving brush stick together when taken out of water primarily due to surface tension; option [A]. Surface tension arises from cohesive forces between water molecules, causing them to attract each other. When the shaving brush is submerged in water, water molecules adhere to the hairs and create a thin film on their surface. Upon removal from water, the cohesive forces between the water molecules cause them to cling together, resulting in the hairs sticking together.
While viscosity, elasticity, and friction play roles in various phenomena, they are not the primary reasons for the hairs of the shaving brush sticking together. Viscosity refers to a fluid’s resistance to flow and does not directly affect the hairs of the brush. Elasticity pertains to the ability of a material to return to its original shape after deformation and is not relevant to the sticking of the hairs. Friction is the resistance encountered when one object slides over another, but it is not the dominant factor in this scenario.
Understanding the role of surface tension elucidates why the hairs of the shaving brush tend to stick together when removed from water, a phenomenon commonly observed in daily grooming routines.
See less