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Kinematics
Kinematics is the study of how a body moves. This includes linear motion, angular motion, and rotational motion.
3,459 Questions
At the highest point of the particle's trajectory, its kinetic energy will be zero because it momentarily comes to a stop at that point. Potential energy will be at a maximum at this point.
How are work and potential energy related?
Work is the transfer of energy from one system to another, often resulting in a change in an object's potential energy. When work is done on an object against a force (e.g., lifting an object against gravity), its potential energy increases. Conversely, when work is done by a force (e.g., object falling due to gravity), potential energy decreases.
Does oil work better then water in reducing friction between two surfaces?
Oil fills in the gaps (bumps on every surface at microscopic level) of machine parts to reduce friction, damage and heat. If there weren't any oil, the engine would only last minutes before it would melt down. The oil reduces friction but doesn't get rid of it completely....If this answer isn't very good, I'm sorry im just 12:)
What does normal meter cubed per hour mean technically?
Normal cubic meters per hour (often abbreviated NCMH) is a measure of flow rate, commonly used in the Natural Gas industry. It is equal to one cubic meter under "normal" conditions, defined as 0°C and 1 atmosphere (101.3 kPa). This should not be confused with standard cubic meters per hour (SCMH) or standard cubic feet per hour, which are defined in the gas industry at 60°F and 1 atmosphere. These units may be converted as 1.000 NCMH = 1.056 SCMH = 37.31 SCFH.
Whenever you see a unit of time -- usually the second, s, but occasionally the minute or hour -- in the denominator of fractional units, we are dealing with a rate. Meters per hour, for example, implies a rate of speed or velocity, which is the change in displacement (distance) per unit time. The question, however, is about cubic meters per hour. We still have a rate here, but it's not a rate of speed, because the numerator -- the top number -- is not meters but cubic meters. So, a brief discussion of cubic meters -- or, if you prefer, meters cubed, m3 -- is in order first. A cubic meter is a unit of volume. Think of it as the amount of space occupied by a cube measuring one (linear) meter on each edge. A cubic meter is equal to about 1,000 liters or 264.2 gallons [US]. So one cubic meter per hour (m3/hr) is a rate of volume. In other words, it's a flow rate. More familiar units of measure for flow rate are gallons per minute or liters per second. Both of those imply a quantity of something per unit time. But cubic meters per hour is also a legitimate unit of measure for flow rate. Let me give you an example. Let's say you have a backyard swimming pool that contains 13,250 gallons of water (about the size of round pool with a 24-foot diameter. That's equivalent to about 50 cubic meters. If you fill that pool with a garden hose in ten hours, you know that the flow rate of the hose is five cubic meters per hour. That's a pretty substantial flow rate for a garden hose! (The hose is delivering more than a gallon of water every three seconds. That's a lot but not out of the realm of possibility.) A "normal" cubic meter refers to the conditions of measurement. As this is a flowrate, the volume of a given mass of gas fluctuates with temperature and pressure (PV=nRT ring a bell?). Normal is a set of conditions at which the volume stated. In other words, since the volume varies with these conditions, if we want to talk about flow, we have to pick conditions first. Normal are simply a set to which we all agree upon. Unfortunately, it depends on whom is agreeing on the term. Different industries have picked different "normal conditions." In the case of natural gas, 60°F and 14.73 psia. This is different for STP (Standard Temperature and Pressure) which are often termed 25°C and 1 atm. Again, you have to know which industry took the number to know which standard is being applied (though it generally only makes subtle differences as these are all very similar conditions).
What is the formula for kinetic and potential energy?
Kinetic= KE= 1/2 MV^2 m= mass, v= velocity
Potential= PgH= mgh m=mass, g= gravity, h= height
PE=potential energy (joule)
m=mass (kg)
g=gravitaional acceleration (m/sec^2)
h= height (m) elevation
ex.
Given Solution.
m= 5 PE= m g h
h=100m =(5 kg) (9.75 m/sec^2)(100m)
g=9.75m/sec^2 =PE 4875 joules
Why pressure is scalar quantity where as force is vector quantity?
Pressure is the force acting in all directions on an area while force is a push or pull in a direction. To understand this, we have to know how pressure or force originates. While the force is applicable to rigid materials, the term pressure is applicable for bulk materials (like water) where individual particles are considered as soft. When a force is applied from one direction on the soft particle, the soft particle gets distorted and projects out in all directions. Pressure thus do not have any unique direction but all, while a force has a unique direction. When a bomb blasts, it effects in all directions in air whereas if a running car hits, it effects in the specific direction only. A parameter effecting in all directions uniformly is considered as if it is a scalar.
The pressure acts to all the directions uniformly. I mean in 360 degrees. So, we can't define a direction for pressure.
The formula P= F/A is only the magnitude relation, not direction. It should be kept in mind.
Mathematically, it can be understood as pressure is the ratio of force and vector area (which has direction along the normal to the surface upon which the force is acting, and if the force is not normal to to the surface we take component of force along normal. )
Total change in momentum = zero (law of conservation of momentum).
Also, a change in momentum is equal to the impulse, which is force x time .
A formula is: d/dt (Mv) = F, which is one of Newton's laws of motion.
Friction helps objects grip and prevent slipping. It allows for traction between surfaces, enabling us to walk, drive vehicles, and hold objects securely. Additionally, friction is essential for processes like writing with a pen or pencil because it creates the necessary resistance for the ink or graphite to transfer onto paper.
How is energy conserved when a tv is working?
When the TV is on the light and sound is coming out so when the two energies are active it produces heat.
What factors affect an objects kinetic energy?
Kinetic energy of a body depends on:
(a) Its mass;
(b)Its velocity, K.E=mv2/2...
And its potential energy depends on,
(a)Its mass
(b)Acceleration due to gravity
(c)Height from reference point (P.E=mgh)
(This situation describes only when gravity is involved. When other forces are present, such as coulomb, nuclear forces etc, there is potential energy associated with the forces too.)
Kinetic and potential energy are affected by various factors. Let's dive into them. Kinetic energy is the energy an object produces when moving. Due to gravity, kinetic energy is affected by the object's mass and velocity.
What causes rough acceleration on a 2001 Chevy impala?
Rough acceleration in a 2001 Chevy Impala could be caused by issues with the fuel system, such as a clogged fuel filter or dirty fuel injectors. It could also be due to a problem with the ignition system, such as faulty spark plugs or a malfunctioning ignition coil. Additionally, a dirty air filter or a vacuum leak could also result in rough acceleration.
One object has twice as much mass as another object the first object also has twice as much what?
weight = mass * gravity, so as long as the force of gravity is the same on both, an object with twice the mass will weigh twice as much.
The question is already resolved into horizontal and vertical components for us.
This is a very thoughtful and considerate favor, because now, we can completely
ignore the horizontal details.
-- The bullet is fired with an initial vertical velocity component of 50.0 meters/second.
-- The bullet will continue ascending for 50.0/10 = 5.00 seconds, before it
runs out of gas, surrenders to gravity, and begins to descend.
Additional factoids that emerge from the work but are not required for full credit
on the exam question:
-- The gun is aimed 30 degrees above the horizontal, and the bullet leaves it at 100 meters/second.
-- The highest altitude above ground achieved by the bullet is (125 meters) + (altitude of the gun muzzle).
-- Horizontal distance the bullet travels at or above the altitude of the gun muzzle is
(86.6 m/s) x (10 sec) = 866 meters. -- The Earth's curvature, and the effects of air resistance, are ignored to make
the calculation easier.
-- We're dealing with a very slow bullet here. Even the mild-mannered 22-caliber
"Short round" , with a 1.9-gram bullet and either a small amount of gunpowder
or none at all, intended only for indoor training or target practice, has a typical
muzzle velocity of around 210 meters/second ... double that of the fearsome
projectile described in the question.
No, it is a scalar. Energy is the capacity to do work.
Answer2:
Yes. Energy is a scalar and a vector. Energy is a Quaternion quantity consisting of a scalar and three vectors, forming a 4D quantity.Early scientists started with scalar quantities. With Faraday's field theory (directed lines), vectors came into physics.
However, the early definition of energy as scalar persisted to this day.
Vector energy is all around us, but we are blinded by dogma. F.D is called energy, but FxD is vector energy but is called Torque.
I think we are about to lift the blindness. "Dark Energy" in Astronomy is vector energy. The Dark Energy is cmV = cP. Here is vector energy, Momentum energy. Momentum is a vector and Momentum energy cP is also a vector. A scalar c times a vector is a vector ! If there is vector momentum, there must be vector energy!
The correct Equation off Gravitation Energy is E = -mGM/r + mcV = -mu/r + cP.
Newton did not include the vector energy cP=cmV. This was equivalent to saying the mass m, had velocity zero , E= -mu/r + mc0. Such is NOT the case. This is like saying the earth is orbiting the sun with velocity 0, when it is moving at 30km/s. it is the vector energy cmV that provides the centrifugal force to keep the earth from falling into the sun. It is the vector energy that is the "dark Energy" that is the anti-gravity (centrifugal) force. Vector Energy removes teh mystery of "Dark Energy".
Newton's Three laws are derived from this vector energy, that Newton incorporated.
Force F = XE = [d/dr, DEL] m[-u/r , cV]
F = m[v2/r - cDEL.V, cdV/dr +u/r3 R + cDELxV]
At Equilibrium 0 = F and DELxV=0 meaning R and V are parallel and. It is essential that DELxV =0 for the vectors to sum to zero.
The result is
0 = m[v2/r - cv/r, cdV/dr + u/r3 R ]
Equilibrium Condition exists when v/c=1 or v=c.
Newton's Equal and Parallel phrase comes form
0 = m(dV/dt + u/r3 R) comes from
0 = cdV/dr - DEL u/r
Newto added the term 'mdV/dt' a vector, before vectors, This term is the vector energy P=cmV and dcP/dr = cmdV/cdt = mdV/dt, voila!
It is time to recognize that we live in a 4D Universe and Energy is a 4D Quantity.
Must a particle have non-zero rest mass in order to have momentum?
Yes. A particle of zero rest mass has ONLY its relativistic mass when in motion. There are actually no photons just sitting around.
Can the velocity of an object be negative when its acceleration is positive?
Yes, velocity of an object can be negative. This can be better explained with object in free space like aircraft. Aircraft's speed is measured relative to direction in which it is flying, its usually called airspeed. You might have seen in many modern fighter aircraft videos that's maneuvering, they fly straight up and then they fall vertically. During this vertical fall, aircraft is accelerating downwards & due to suction created in-front of pitot tube (Device used to measure airspeed) velocity measured is negative.
A. mass times its velocity. Momentum is calculated by multiplying an object's mass by its velocity.
Scalars are quantities that have magnitude only; they are independent of direction. Conversely, vectors have both magnitude and direction.
A scalar quantity is any numeric value that has no spatial direction. So let's look at your four tests.
- Time. We can give it a numbers; so it qualifies as a numeric value. Can it have spatial direction? No. It marches on, but in no direction. Saying 2 minutes south, for example, makes no sense whatsoever. So it's a scalar quantity.
- Speed. Again with the numbers...25 mph for example. But can it have a direction. Yes. 25 mph heading north makes sense; and because it also has direction it is not a scalar but a vector; when speed has a direction it is called Velocity. Note: all vectors will have a scalar component, but not all scalars will have direction.
- Position. This is tricky. What is the numeric value of position? Distance...25 miles, for example, gives us an interval in space. Can this interval have spatial direction? Yep. 25 miles north of my house, for example, gives the direction of the interval. But like velocity, if we leave off the direction, we are left with the scalar...25 miles. In fact, position and velocity are related. If I divide the 25 miles north by 1 hour interval in time to travel to that position, I'd have 25 mph north...the previous velocity.
- Acceleration. We can assign numbers, like 9.81 m/s²; so without direction, it is a scalar. Does assigning a direction make sense? Sure. Braking at 4 m/s² in a westerly direction makes perfect sense. So, with its direction added, acceleration can be a vector just like position and velocity. In fact, the three are related, which is why they are all three capable of being vectors.
What could cause a Mazda B2200 to begin stalling after reaching 55 or 60 miles per hour?
One possible reason for stalling at higher speeds could be a clogged fuel filter or a failing fuel pump that is not supplying enough fuel to the engine. Another common issue could be a malfunctioning mass airflow sensor or a problem with the ignition system such as faulty spark plugs or a failing ignition coil. It is recommended to have the vehicle diagnosed by a mechanic to determine the exact cause of the stalling issue.
Vector quantities are the quantities that have magnitude as well as direction. To express a vector quantity, we must specify the direction along with the magnitude.
Examples are :- velocity, acceleration, torque, momentum, impulse, amplitude, wavelength,etc..
Kinetic energy is the energy that an object has due to its motion or movement. For instance if a car drives into a wall the energy of its movement is what destroys the wall, That energy is kinetic energy.
Note: Heat is also a form of Kinetic energy because heat is the movement (vibration energy) of atoms or molecules.
How are temperature and kinetic energy related?
Matter is made up of particles (atoms and molecules); temperature is closely related to the average kinetic energy per particle. More precisely, the average kinetic energy per particle per degree of freedom.
What would the kinetic energy of a rock sitting on the ground be?
Zero.
You need to think in terms of "frame of reference" as in what are you comparing the rock to. If you are an observer sitting next to the rock then the kinetic energy of the rock RELATIVE TO YOU is zero - I.E. the rock isn't moving relative to you and thus has no kinetic energy - energy of motion - relative to you.
If you are an observer sitting a million miles from earth watching the rock then it is zipping around at 1000 miles per hour as the earth spins on its axis and it has significant kinetic energy RELATIVE TO YOU. You need to think in terms of "frame of reference" as in what are you comparing the rock to. If you are an observer sitting next to the rock then the kinetic energy of the rock RELATIVE TO YOU is zero - i.e. the rock isn't moving relative to you and thus has no kinetic energy - energy of motion - relative to you.
If you are an observer sitting a million miles from earth watching the rock then it is zipping around at 1000 miles per hour as the earth spins on its axis and it has significant kinetic energy RELATIVE TO YOU. ---- So we don't get bored, no kinetic and no gravitational potential energy.
You were going 42 mph in a 25 mph how much is your ticket?
The cost of a speeding ticket can vary depending on location, but going 17 mph over the speed limit could result in a fine of $150-$200. Additionally, there may be additional fees and court costs associated with the ticket.
Why does a car slow down sputter then backfire on acceleration?
This is a very broad question, but I will say this it is more than likely bad fire (spark) or bad fuel (not enough, too much, poor quality). Spark could be any thing from sparkplug all the way back up to the distributor or timing. Fuel could be water or rust in the fuel, clogged injector/injector's. probably NOT fuel pump or filter.
