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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
Velocity is the time rate of change of displacement of an object.
Velocity is the distance travelled in unit time in a stated direction. It is a vector quantity since it gives us both magnitude and direction.
What are the 3 types or classes of levers?
A claw hammer is a lever when using the claw to pull a nail. A crowbar or pry bar is also a lever. Automobile friction jacks are also levers. Your arm is a biological (biomechanical) lever.
How can you calculate acceleration from a velocity-time graph?
simply put the acceleration is the slope of the speed vs time graph
Theory Part
think of it this way. the unit for speed is meters per second or m/s
the unit for acceleration is meters per second per second or m/s2
so essentially if speed is the change in position per change in time, acceleration is the change in speed per change in time.
Practical Part
now for the actual answer. look at the slope of your speed vs time graph at any time. that slope is the acceleration at that time. If you find the slope between two points on your graph, that gives you the average acceleration over that interval of time.
Temperature is defined as the average amount of kinetic energy in a substance or a system?
Yes, temperature is a measure of the average kinetic energy of particles in a substance or system. It helps to determine how hot or cold an object is relative to another. Temperature is commonly measured in units such as degrees Celsius or Fahrenheit.
When does an object have the same potential and kinetic energy?
When it is not moving or think of it like this when you climb a cliff when your on the top you have potential energy but as you climb down you are starting the state of kenetic energy. Therefor potential energy is when you are not moving. Or when energy is stored.
How many miles per hour to reach a 6 minute 30 second mile?
You must average at least 9.23 miles per hour to achieve that time.
What is a screw used for in daily life?
Archimedes' invention of the screw is for digging into things. A drill is an example of a screw. During Archimedes' time, people used the screw to bring water from low ground level to high ground level. The screw is also used for building things too. They are used like nails to put things together.
What does a tangent to a velocity-time graph measure?
It will measure acceleration in the direction towards or away from the origin.
Can you convert mass into kinetic energy?
Yes. Stars do this all the time in fusion reactions. When we cause fusion or fission, we can do that, too. In Einstein's famous E = mc2 equation, you'll note that energy (E) is equal to mass (m) times the square of the speed of light (c). Mass and energy are related. They are equal (with the square of the speed of light as a factor), and they can be changed from the one to the other. The only trick is how to make those conversions from mass to energy. It's a challenge, and it can be dangerous. A little bit of mass makes a whole lot of energy! A whole lot!
How do you find the distance from a velocity time graph?
this time is basically the instant when an object has a particular velocity(instantaneous velocity). so on the graph draw a line from the particular value of the velocity and then draw a vertical line on time axis to find the time for that velocity.
What happens to the energy of semiconductor when the temperature of the room increases?
When electrons are given energy, they can "jump" to a higher energy level or "electron shell". It would then be in an excited state. When it returns, it will emit the energy in the form of an electromagnetic wave (light).
A good example is a simple filament lightbulb. Electrons undergo thermal excitation (excited by heat) and will emit a whole range of electromagnetic waves (in the visable region of the spectrum, but also a lot of lower energy infra red light)
Does the shape of an object change the speed that it falls through the water?
yes for example say one object was a circle the other object was a oval the oval would be heavier because the oval is wider than the circle
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There are so many errors expressed and implied in the first answer above that
it's best to just ignore it.
The answer to the question is:
The shape of the object affects its behavior in a fall IF it's falling through a material
substance, like air or water. If it's falling through vacuum and not through stuff, then
all objects fall with exactly the same speed and acceleration, regardless of their shape,
size, weight, color, temperature, density, creed, sexual preference, national origin, or
political affiliation.
Is it possible a rest body is not in equilibrium?
Rest implies stationary, equilibrium implies a resultant force of zero. Therefore, a body in equilibrium could be moving, for example a sky diver at terminal velocity, where resistive forces are equal to the force of gravity. This means that a body can be in equilibrium and not at rest, but a body at rest MUST be in equilibrium, otherwise it would move. So, to answer the question is: It's impossible.
Is momentum conserved in a perfectly inelastic collision?
In any physical process, momentum will always be conserved. Momentum is given by p = m*v. There is also something called law of conservation of momentum.
How do you increase energy in drinking water?
The surface molecules of the water will evaporate.
As the kinetic energy increases the water molecules become more free, which causes the water to evaporate.
10,000km per hour is the same as 6,213.71 miles per hour.
What are the basic areas in physics?
Mechanics - motion and its causes ex. falling objects, friction, weigh, spinning, rocket motion Electromagnetism - electricity, magnetism, and light ex. electrical charges and circuits Optics - light ex. mirrors, color, lenses, and astronomy Thermodynamics - heat and temperatures ex. melting, freezing and ect. process engines refrigerators Vibrations and Waves Phenomena - specific types of repetitive motions ex. springs, pendulums, and sound Quantum- behavior of subatomic particles ex. atoms and its parts Relativity - things moving near the speed of light ex. objects in outer space falling into a black hole, the bending of light around a star
