Mechanics

Momentum refers to the quantity of motion an object has. It is calculated by multiplying an object's mass by its velocity. In physics, momentum is a vector quantity, meaning it has both magnitude and direction.

As a falling object accelerates through air, its speed increases and air resistance increases. While gravity pulls the object down, we find that air resistance is trying to limit the object's speed. Air resistance reduces the acceleration of a falling object. It would accelerate faster if it was falling in a vacuum.

sound waves are compression waves, or longitudinal waves. sounds that we hear are actually just compressions and rarefactions of air particles, meaning the air particles move closer together for a time period then spread apart farther then they normally would rarefaction)

Blood is a homogeneous mixture because it is the same everywhere in one's body. A homogeneous mixture is like a cup of coffee. In the cup, the sugar, creme, and coffee are evenly mixed. A heterogeneous mixture is like a bowl of Fruit Loops. The different colors of the cereal are not mixed with each other. Homogeneous mixtures are the same throughout, and heterogeneous mixtures are different throughout.

ACTUALLY THAT IS WRONG I JUST TOOK AN EXAM THE ANSWER IS HETEROGENEOUS MIXTURE BECAUSE ITS NOT EVENLY THROUGHOUT BUT HAS DIFFERENT COMPOSITIONS

The product of an object's mass and velocity is known as momentum. Momentum is defined as mass times velocity and is a vector quantity, meaning it has both magnitude and direction. It is often denoted by the symbol "p."

Mechanical equilibrium occurs when the forces acting on an object are balanced, resulting in no net force on the object. This means the object will remain at rest or move at a constant velocity. It can be achieved by balancing forces in various directions.

Because you are generally sitting down with your feet off the floor or ground when you are swinging your legs, and your legs just naturally bend at the knees when you are sitting down. It is impossible to swing your legs back and forth standing on your feet.

The coefficient of kinetic friction can be calculated using the formula: coefficient of kinetic friction = force of kinetic friction / normal force. The force of kinetic friction can be found using the formula: force of kinetic friction = coefficient of kinetic friction * normal force. Given the force of 31N and normal force equal to the weight of the crate (mg), you can calculate the coefficient of kinetic friction.

The coefficient of friction for talcum powder can vary depending on the surfaces it is in contact with. On average, talcum powder has a low coefficient of friction due to its fine, powdery texture. It is commonly used to reduce friction between surfaces.

A homogeneous mixture is a substance that is uniform in composition. Solutions are examples of homogeneous mixtures.

A heterogeneous mixture is a mixture in which the composition is easily identified, as there are two or more phases present. Suspensions are examples of heterogeneous mixtures.

Particle size distinguishes homogeneous solutions from other heterogeneous mixtures. Solutions have particles which are the size of atoms or molecules - too small to be seen.

In contrast a suspension is a heterogeneous mixture of larger particles. These particles are visible and will settle out on standing.

Corn oil, white vinegar a saturated sugar solution is homogeneous since only a colorless liquid is observed. Air with no dust is also a homogeneous.

Beach sand is heterogeneous since you can see different colored particles. Vinegar and oil salad dressing is heterogeneous since two liquid layers are present, as well as solids. Air with clouds is heterogeneous, as the clouds contain tiny droplets of liquid water.

Homogeneous is a single phase mixture that means we observe only one state and material shows same properties on all of its part while heterogeneous material consists of at least two phases that means two different visible states.

A zero force member is a structural member within a truss that is not subject to any force due to the geometry and external loading conditions. These members do not affect the overall stability or load-carrying capacity of the truss structure and can be identified and removed to simplify the analysis of the truss.

The coefficient of friction for air flow in a round duct is typically around 0.02. This coefficient may vary depending on factors such as surface roughness and airflow conditions.

Any force can produce work if it causes displacement. If displacement is in opposite direction of force, work done will be negative and if displacement is in direction of force work done will be positive. If there is no displacement, work done is zero. Eg: Gravitational force pulls you down towards earth, in pulling you down it does work on you which gets stored in form of potential energy.

Energy for A+

Friction is the force resisting the relative motion of solid surfaces, fluid layers, and material elements sliding against each other. There are several types of friction: Dry friction is a force that opposes the relative lateral motion of two solid surfaces in contact.

Two circular objects of different sizes that rotate together is a wheel and axle. Inclined plane wrapped around a central cylinder or bar to form a spiral is a screw.

no it is in fact a first class lever because a see-saw is first class and this is basically a see saw except instead of a handle on each side there is 2 on one side so therefore its a first class but people think it is a second class because of scissors but this a scissors have a difference and that difference it that when using scissors when you move one handle, it moves on the other side of the fulcrum but with a can opener the handles make the actual metal that opens the can move not just the same thing but on the other side

Open doors and windows are considered to be completely absorptive (a=1) because all the sound waves continue traveling out the space instead of being reflective back into the room.

It should be noted that for the case of doors or windows opening into a space where another wall may reflect the sound (hallway, closet, etc.) then the absorption will be less than ideal, but still fairly significant.

A gas cannot easily pass through a liquid or a solid however it can be entrapped in it . If a gas bubble is formed in a liquid it moves upward and escapes out of the liquid. Gas cannot pass through a solid barrier.

There are many equations to solve for energy, depending on what form of energy your looking at. For kinetic energy, us KE = (1/2)mv2 where KE is kinetic energy, m is mass, and v is velocity. For potential energy used PE=mgh where PE is potential energy, m is mass, g is gravity, and h is height. Mechanical energy is PE + KE. There are also numerous equations for finding the amount of thermal energy.

If the net force on an object is zero, we can say that the forces are balanced, or that they are in equilibrium(which really means the same thing). There may be forces acting on the object, but there is an equal and opposite force pushing or pulling in the opposite direction, and all the forces balance out. Alternatively, there may be no forces acting on the object at all.

It will stretch 6 cm.

mass x velocity = momentum.

(velocity = speed with a direction)