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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
The average kinetic energy of the molecules in an object is what law of thermodynamics?
The average kinetic energy of molecules in an object is governed by the first law of thermodynamics, which states that energy cannot be created or destroyed, only transferred or transformed. This is because the kinetic energy of molecules is a form of internal energy that is included in the total energy of the system.
On a speed time graph the slope measurses acceleration?
If an object is allowed to free-fall under gravity, it will accelerate downwards at 9.8 metres per second per second (m s-2). This is equal to the standard gravity, symbol g, which on the surface of Earth has a value of around 9.8 newtons per kilogram (N kg-1) or 9.8 m s-2. Both units are equivalent.
This is because the acceleration of an object is given by the net force that acts on it (in newtons) divided by its mass (in kilograms). This is Newton's second law:
F = m a
So a = F / m
In the case of a free-falling object, the only force acting on the object is gravity, and the magnitude of this force is the mass of the object multiplied by standard gravity.
F = m g
So the acceleration a = g, the standard gravity.
On the other hand, consider an object at rest on a horizontal surface. The force of gravity still acts on the object, but it is being counteracted by an upward force provided by the surface, which is equal and opposite to the force of gravity.
An object on a slope is somewhere between these two. Part of the force of gravity is counteracted by an upward force provided by the slope, but the remainder causes the object to accelerate down the slope (assuming the object is round or slippery). In fact we need to resolve the force into its components by using trigonometry.
To answer the question, if the slope is at an angle theta (θ) to the horizontal, then the acceleration is given by:
a = g sin(θ)
If the slope is perfectly horizontal then θ = 0, and sin (0) = 0, so a = 0, and the object does not move.
What happends to potential energy as a squashed ball regains its shape?
As a squashed ball regains its shape, the potential energy stored in the ball decreases. This potential energy is converted back into kinetic energy as the ball expands, causing it to bounce back to its original shape.
Is it scalar or vector when a car stops at a stop sign?
It is neither a scalar or a vector? Scalar and vectors are used to describe quantities, for example scalars include distance and mass, while vectors include weight and velocity. We do not say that a situation is a scalar or a vector.
Why do they call it 100 mph tape?
"100 mph tape" is a nickname often used for duct tape because of its versatility, durability, and ability to hold up even at high speeds like 100 mph. It is known for its strong adhesive properties and wide range of uses in emergency situations, repairs, and construction work.
Can we have physical quantities which have magnitude and direction but are not vectors if yes how?
yes we can have.
for eg electric current, pressure etc
though these quantities have both magnitude and direction their directions are not necessary to define them
and vectors are those quantities which has magnitude and requires direction to be defined
" quantities having both magnitude and direction is a vector" is not a corrrect definition ofa vector
Why current density is vector quantity?
Current is not scalar. Current is a vector quantity. For simplicity, in electric circuits, current is scalar because the direction is assumed to be one way or another, rather than three dimensional.
What would happen if a spherical volume of air instantaneously disappeared?
It depends on the size of the disappearing sphere. If a small sphere disappeared then air from adjoining space would move in and balance would soon be be restored. However, if a large sphere disappeared then the adjustment could involve extreme turbulence.
If one assumes air resistance to be negligible, then:
final velocity = sqrt( g * 2 * h )
where g is 9.8 metres per second per second.
The quantities v and m do not matter, because gravitational acceleration does not depend on mass (all objects fall at the same rate) and because the horizontal velocity is independent of the vertical velocity.
If the required time is measured from 0 then s = t2 - 8t, therefore 9 = t2 - 8t, which can be written as t2 - 8t - 9 = 0
This equation can be factored as (t - 9)(t + 1) = 0
As we are only concerned with a positive time then the answer is when t - 9 = 0, thus t = 9 seconds.
Calculate 47.3 miles per hr to km per hr?
47.3 miles per hour is approximately equal to 76.1 kilometers per hour when converted using the conversion factor 1 mile = 1.60934 kilometers.
To find the increase in temperature of the brakes, you need to calculate the total kinetic energy of the car before braking and then determine the amount of energy absorbed by the brakes during braking. Using the equation for kinetic energy (0.5 x mass x velocity^2) for the car before braking and equating it to the energy absorbed by the brakes, you can then find the increase in the temperature of the brakes using the specific heat capacity of iron.
Kilometers are not dimensionally equivalent to miles per hour, and thus cannot be converted without an additional time measurement.\
250 km = 155.34 mi
250 km/h = 155.34 mph
These are the only true conversions.
When a moving train stops kinetic energy is changed to?
When a moving train stops, its kinetic energy is primarily converted into heat energy due to friction between the train's brakes and the track. Additionally, some kinetic energy may also be converted into sound energy and vibration energy during the process of stopping.
22 miles per hour in kilometers per hour?
22 miles per hour is approximately equivalent to 35.4 kilometers per hour.
Can kinetic energy be measured in newtons?
No, kinetic energy is measured in Joules (J), as this is the SI unit for energy.
Not necessarily. The total momentum of a system of objects is conserved unless external forces are present. In a collision involving three objects, the total momentum before the collision could be equal to, greater than, or less than the total momentum after the collision, depending on the specific circumstances of the collision.
Top speed of a 1977 bandit trans am?
The top speed of a 1977 Bandit Trans Am is around 125-130 mph, depending on factors such as engine condition and modifications. These cars were equipped with a 6.6L V8 engine producing around 200-220 horsepower.
The potential energy of the pear can be calculated using the formula: PE = mgh, where m is the mass (0.14 kg), g is the acceleration due to gravity (9.81 m/s^2), and h is the height (3.5 m). Plugging in these values, we get PE = 0.14 kg * 9.81 m/s^2 * 3.5 m = 4.857 J.
What body function can reach 200 mph?
Cover your face, now... a sneeze. Incidentally, when you sneeze, it is impossible for you to keep your eyes open by force of will. Your eyes will close.
What is the potential energy of a 500 N weight before it falls 10 m?
500 n is a force created by a mass (500 / 9.807) = 50.98 kg
so: potential energy = m * g * h = 50.98 * 9.807 * 10 = 5000 joules.
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if it was 500 kg (not newtons) weight, then m*g*h = 500 * 9.807 * 10 = 49035 joules.
What 2 things increase as kinetic energy increases?
Generally speed. But also, if the obect is for example travellin up, the potential energy also increases.
What is Gravitational Kinetic energy?
There is no such thing as "gravitational kinetic energy". Kinetic energy is energy contained in movement, and it doesn't make any difference, for the energy contents, whether an object was accelerated by gravity or by any other means. All you need to know is the object's speed and mass. "Gravitational energy" basically refers to the potential energy which an object has as a result of the gravitational field.
Answer2:
Gravitational "kinetic" energy is mv2 equal to mGM/r the potential energy or scalar energy. This gives v2 = GM/r, and the orbit frequency w2 = GM/r3.
Gravitational Energy also has vector energy cP= cmV, creating a Quaternion Energy. cP is the so-called "Dark Energy":
Total Energy E = -mGM/r + cP = [-mu/r, mcV]
The force is the first derivative:
F = [d/dr, Del] m[-u/r, cV] = m[u/r2 - cDel.V, cdV/dr -Del u/r + cDelxV]
F = mcv/r[v/c - cos(V), -1V + v/c 1R + sin(V) 1H]
Conservation of Gravitational Energy occurs at v/c= cos(V) = 1 and V is parallel to R. v/c = cos(V) is the redshift, v/c is the Gravitational Fine Structure Constant.
An example of kinetic energy continuously being changed to potential energy and back again might be?
A pendulum is a classic example where kinetic energy is continually converted to potential energy and vice versa. As the pendulum swings, it reaches its highest point where it has maximum potential energy and minimum kinetic energy, and at the lowest point of its swing, the opposite is true with maximum kinetic energy and minimum potential energy.
Why does a spinning ice skater pull her arms close and extend them?
A skater will pull his/her arms in close to their body while spinning to increase the speed and force of the spin in routines this also helps to improve the fluency of the routine and is able to keep going in time to the music. They extend their arms to improve the look of the spin within a performance or routine
hope this answered your question :)
