When a carpet is beaten with a stick, the mechanical action causes the emergence of dust and particles that have accumulated within the carpet over time. Several factors contribute to this phenomenon. Accumulated Debris: Carpets accumulate dust, dirt, and particles within their fibers and beneath thRead more
When a carpet is beaten with a stick, the mechanical action causes the emergence of dust and particles that have accumulated within the carpet over time. Several factors contribute to this phenomenon.
Accumulated Debris:
Carpets accumulate dust, dirt, and particles within their fibers and beneath the surface due to daily use and environmental factors.
Mechanical Disturbance:
The impact of beating the carpet with a stick creates mechanical disturbance and vibration within its structure.
Loosening Particles:
This mechanical force causes the carpet fibers to flex, dislodging and releasing the trapped particles embedded within the carpet’s structure.
Airborne Release:
The sudden impact and vibrations generate a disturbance, ejecting the dislodged particles into the air.
Dislodging from Pile:
Particles trapped within the carpet pile due to gravity or electrostatic forces are forcefully dislodged by the kinetic energy applied during beating.
Conclusion:
Beating a carpet dislodges and releases accumulated dust and debris trapped within its fibers. This mechanical action causes the particles to loosen and become airborne, contributing to a cleaner carpet surface. Regular cleaning methods, including beating or vacuuming, aid in maintaining a cleaner and healthier indoor environment by removing embedded dust and particles from carpets.
- Safety Assurance: Tying luggage with a rope prevents items from falling off the bus roof during travel, reducing the risk of accidents and ensuring passenger and pedestrian safety. - Stability and Security: It maintains stability by securing the luggage in place, minimizing shifting or sliding durRead more
– Safety Assurance: Tying luggage with a rope prevents items from falling off the bus roof during travel, reducing the risk of accidents and ensuring passenger and pedestrian safety.
– Stability and Security: It maintains stability by securing the luggage in place, minimizing shifting or sliding during the bus’s movement and preventing displacement due to sudden maneuvers.
– Regulatory Compliance: Many transport regulations or safety guidelines mandate the secure attachment of rooftop luggage, ensuring compliance and adherence to safety standards.
– Driver Focus: Securely tied luggage reduces distractions for the bus driver, allowing better focus on safe driving without concerns about loose items.
– Protection from Damage: Properly tying down luggage shields it from potential damage caused by external factors such as wind, rain, or unexpected movements, preserving the integrity of the items during travel.
The correct explanation for why the ball slows to a stop after rolling a short distance on a level ground is: (c) There is a force on the ball opposing the motion. Explanation: - The ball experiences a force opposing its motion, known as friction, between the ball and the ground. - Friction acts inRead more
The correct explanation for why the ball slows to a stop after rolling a short distance on a level ground is:
(c) There is a force on the ball opposing the motion.
Explanation:
– The ball experiences a force opposing its motion, known as friction, between the ball and the ground.
– Friction acts in the direction opposite to the ball’s motion, gradually reducing its speed until it comes to a stop.
– As the ball rolls on the ground, friction between the ball and the surface gradually dissipates its kinetic energy, bringing it to rest.
Why Other Options Are Incorrect:
– (a) The batsman did not hit the ball hard enough: This option does not directly relate to the slowing down of the ball due to friction.
– (b) Velocity is proportional to the force exerted on the ball: While this statement has some truth regarding acceleration (not velocity), it doesn’t explain the ball’s slowing down due to opposing forces.
– (d) There is no unbalanced force on the ball, so the ball would want to come to rest: This option is partially correct in stating that the absence of an unbalanced force leads to the ball’s tendency to come to rest, but it doesn’t directly address the opposing force of friction causing the slowdown.
- Distance traveled by the truck (s) = 400 m - Time taken (t) = 20 s - Mass of the truck (m) = 7 metric tonnes = 7,000 kg (as 1 metric tonne = 1000 kg) Calculating Acceleration: We'll use the kinematic equation ( s = ut + 1/2 at²), where (u) is the initial velocity (which is 0 m/s as the truck startRead more
– Distance traveled by the truck (s) = 400 m
– Time taken (t) = 20 s
– Mass of the truck (m) = 7 metric tonnes = 7,000 kg (as 1 metric tonne = 1000 kg)
Calculating Acceleration:
We’ll use the kinematic equation ( s = ut + 1/2 at²), where (u) is the initial velocity (which is 0 m/s as the truck starts from rest).
s = ut + 1/2 at²
400 = 0 x 20 + 1/2 x a x 20²
400 = 200a
a = 400/200
a = 2m/s²
Calculating Force:
Now, using Newton’s second law of motion F = ma :
Given:
– Mass m = 7000 kg
– Acceleration (a) = 2 m/s²
F = ma
F = 7000 x 2
F = 14,000 N
Conclusion:
The acceleration of the truck rolling down the hill is 2 m/s² , and the force acting on it, considering its mass of 7 metric tonnes, is 14,000 Newtons.
Vigorous shaking of tree branches applies mechanical stress, inducing rapid motion. This stress affects leaf attachments, subjecting them to shearing forces and friction against the surrounding air. Weakened connections due to aging or disease make leaves more susceptible to detachment. Inertia resiRead more
Vigorous shaking of tree branches applies mechanical stress, inducing rapid motion. This stress affects leaf attachments, subjecting them to shearing forces and friction against the surrounding air. Weakened connections due to aging or disease make leaves more susceptible to detachment. Inertia resists sudden changes in motion, contributing to the stress on leaf attachments. The collective effect of mechanical stress, dynamic forces, weakened connections, and natural responses of trees to external stimuli results in the detachment of leaves during vigorous shaking, shedding older or damaged leaves as a survival response to environmental stressors.
When a carpet is beaten with a stick, dust comes out of it. Explain.
When a carpet is beaten with a stick, the mechanical action causes the emergence of dust and particles that have accumulated within the carpet over time. Several factors contribute to this phenomenon. Accumulated Debris: Carpets accumulate dust, dirt, and particles within their fibers and beneath thRead more
When a carpet is beaten with a stick, the mechanical action causes the emergence of dust and particles that have accumulated within the carpet over time. Several factors contribute to this phenomenon.
Accumulated Debris:
Carpets accumulate dust, dirt, and particles within their fibers and beneath the surface due to daily use and environmental factors.
Mechanical Disturbance:
The impact of beating the carpet with a stick creates mechanical disturbance and vibration within its structure.
Loosening Particles:
This mechanical force causes the carpet fibers to flex, dislodging and releasing the trapped particles embedded within the carpet’s structure.
Airborne Release:
The sudden impact and vibrations generate a disturbance, ejecting the dislodged particles into the air.
Dislodging from Pile:
Particles trapped within the carpet pile due to gravity or electrostatic forces are forcefully dislodged by the kinetic energy applied during beating.
Conclusion:
See lessBeating a carpet dislodges and releases accumulated dust and debris trapped within its fibers. This mechanical action causes the particles to loosen and become airborne, contributing to a cleaner carpet surface. Regular cleaning methods, including beating or vacuuming, aid in maintaining a cleaner and healthier indoor environment by removing embedded dust and particles from carpets.
Why is it advised to tie any luggage kept on the roof of a bus with a rope?
- Safety Assurance: Tying luggage with a rope prevents items from falling off the bus roof during travel, reducing the risk of accidents and ensuring passenger and pedestrian safety. - Stability and Security: It maintains stability by securing the luggage in place, minimizing shifting or sliding durRead more
– Safety Assurance: Tying luggage with a rope prevents items from falling off the bus roof during travel, reducing the risk of accidents and ensuring passenger and pedestrian safety.
– Stability and Security: It maintains stability by securing the luggage in place, minimizing shifting or sliding during the bus’s movement and preventing displacement due to sudden maneuvers.
– Regulatory Compliance: Many transport regulations or safety guidelines mandate the secure attachment of rooftop luggage, ensuring compliance and adherence to safety standards.
– Driver Focus: Securely tied luggage reduces distractions for the bus driver, allowing better focus on safe driving without concerns about loose items.
– Protection from Damage: Properly tying down luggage shields it from potential damage caused by external factors such as wind, rain, or unexpected movements, preserving the integrity of the items during travel.
See lessA batsman hits a cricket ball which then rolls on a level ground. After covering a short distance, the ball comes to rest. The ball slows to a stop because
The correct explanation for why the ball slows to a stop after rolling a short distance on a level ground is: (c) There is a force on the ball opposing the motion. Explanation: - The ball experiences a force opposing its motion, known as friction, between the ball and the ground. - Friction acts inRead more
The correct explanation for why the ball slows to a stop after rolling a short distance on a level ground is:
(c) There is a force on the ball opposing the motion.
Explanation:
– The ball experiences a force opposing its motion, known as friction, between the ball and the ground.
– Friction acts in the direction opposite to the ball’s motion, gradually reducing its speed until it comes to a stop.
– As the ball rolls on the ground, friction between the ball and the surface gradually dissipates its kinetic energy, bringing it to rest.
Why Other Options Are Incorrect:
See less– (a) The batsman did not hit the ball hard enough: This option does not directly relate to the slowing down of the ball due to friction.
– (b) Velocity is proportional to the force exerted on the ball: While this statement has some truth regarding acceleration (not velocity), it doesn’t explain the ball’s slowing down due to opposing forces.
– (d) There is no unbalanced force on the ball, so the ball would want to come to rest: This option is partially correct in stating that the absence of an unbalanced force leads to the ball’s tendency to come to rest, but it doesn’t directly address the opposing force of friction causing the slowdown.
A truck starts from rest and rolls down a hill with a constant acceleration. It travels a distance of 400 m in 20 s. Find its acceleration. Find the force acting on it if its mass is 7 metric tonnes (Hint: 1 metric tonne = 1000 kg.)
- Distance traveled by the truck (s) = 400 m - Time taken (t) = 20 s - Mass of the truck (m) = 7 metric tonnes = 7,000 kg (as 1 metric tonne = 1000 kg) Calculating Acceleration: We'll use the kinematic equation ( s = ut + 1/2 at²), where (u) is the initial velocity (which is 0 m/s as the truck startRead more
– Distance traveled by the truck (s) = 400 m
– Time taken (t) = 20 s
– Mass of the truck (m) = 7 metric tonnes = 7,000 kg (as 1 metric tonne = 1000 kg)
Calculating Acceleration:
We’ll use the kinematic equation ( s = ut + 1/2 at²), where (u) is the initial velocity (which is 0 m/s as the truck starts from rest).
s = ut + 1/2 at²
400 = 0 x 20 + 1/2 x a x 20²
400 = 200a
a = 400/200
a = 2m/s²
Calculating Force:
Now, using Newton’s second law of motion F = ma :
Given:
– Mass m = 7000 kg
– Acceleration (a) = 2 m/s²
F = ma
F = 7000 x 2
F = 14,000 N
Conclusion:
See lessThe acceleration of the truck rolling down the hill is 2 m/s² , and the force acting on it, considering its mass of 7 metric tonnes, is 14,000 Newtons.
Explain why some of the leaves may get detached from a tree if we vigorously shake its branch.
Vigorous shaking of tree branches applies mechanical stress, inducing rapid motion. This stress affects leaf attachments, subjecting them to shearing forces and friction against the surrounding air. Weakened connections due to aging or disease make leaves more susceptible to detachment. Inertia resiRead more
Vigorous shaking of tree branches applies mechanical stress, inducing rapid motion. This stress affects leaf attachments, subjecting them to shearing forces and friction against the surrounding air. Weakened connections due to aging or disease make leaves more susceptible to detachment. Inertia resists sudden changes in motion, contributing to the stress on leaf attachments. The collective effect of mechanical stress, dynamic forces, weakened connections, and natural responses of trees to external stimuli results in the detachment of leaves during vigorous shaking, shedding older or damaged leaves as a survival response to environmental stressors.
See less