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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
This can be modeled as a "collision" where momentum is conserved. Momentum equals mass times velocity (p = mv).
Let's call the momentum of the student before the collision ps0 and the momentum of the skateboard before the collision pb0. Let's call the momentums after the collision ps1 and bs1.
Since momentum is conserved, ps0 + pb0 = ps1 + bs1. Plugging the numbers for the momentum gives us:
(45)(3) + (m)(0) = (45)(2.7) + (2.7)(m), where m is the mass of the skateboard.
Simplified:
135 = 2.7m + 121.5
13.5 = 2.7m
m = 5
So the mass of the skateboard is 5 kg.
(Note that the units are all in kilograms, meters, and seconds they call match up in the calculations.)
If the ball's motion is in the horizontal direction, not far at all. So, let's assume you mean the ball's motion is entirely in the vertical direction, and the 50 joules represents the kinetic energy of the ball. If the 50 joules is all kinetic and the ball is heading upward, it will reach its highest point when its kinetic energy is zero and its potential energy due to gravity is at its greatest. At that point all the kinetic energy will have been turned into potential energy, so when the ball is at its apex, its potential energy will be 50 joules. The formula is pretty simple: Ep = mgh. In English, the potential energy, Ep, is the product of the mass, the acceleration due to gravity, and height. So, 50 = 2 * 9.8 * h. Solving for h gives you h = 2.55 meters.
You have a right triangle and can use trig. Degree mode.
tan(theta) = adjacent/opposite( y component )
tan( 60 degrees) = (5 m/s)/(y comp.)
y component = 5 m/s)/(tan 60 degrees)
= 2.887 m/s ( you can call it 3 m/s )
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What is kinetic energy in chemistry?
In chemistry, kinetic energy refers to the energy associated with the movement of particles. It is related to temperature, with higher temperatures leading to greater kinetic energy and faster particle movement. This energy is important in chemical reactions as it affects the rate at which reactions occur.
What happens when kinetic energy is absorbed as an object moves toward the earth?
The kinetic energy increases as the velocity increases (KE = 1/2mv2) until terminal velocity is reached, at which point the velocity becomes constant, and kinetic energy will no longer increase. The potential energy and kinetic energy will be at equilibrium, where PE = -KE.
There is no finite answer to this, since the term Mach (the speed of sound through air or water) changes based on the temperature of the air itself. In 60 deg F air at sea level, Mach 1 is 761mph. In dry air at 68 deg F, mach 1 is 768 mph. Mach 1.4 is 1.4 x these speeds. Usually Mach speeds are used for objects travelling in air, but not always. Mach 1 in water is 4.3 times faster than air and Mach 1 in iron is 15 times faster than air.
When does a mass accelerate uniformly?
A mass accelerates uniformly when a constant force is applied to it, resulting in a constant rate of change in velocity over time. This occurs in scenarios where there is no opposing force or acceleration due to factors such as friction, air resistance, or gravity.
How do you calculate velocity using kinetic energy?
You cannot directly calculate velocity using kinetic energy alone. Kinetic energy is defined as (1/2)mv^2, where m is mass and v is velocity. You can, however, use kinetic energy along with other information like mass or height to calculate velocity using principles of energy conservation.
How do you determine feet per second?
To determine feet per second, divide the distance in feet by the time in seconds it takes to cover that distance. The formula for calculating speed is Speed = Distance / Time. For example, if an object travels 60 feet in 10 seconds, the speed would be 60 feet / 10 seconds = 6 feet per second.
Why does the y-value of the velocity vs. time graph stay constant?
You're looking at one specific velocity/time graph that we can't see.
From your description, we can tell that the object whose motion is described
by that graph is moving at a constant rate of speed ... which is exactly what
you just said while looking at the graph.
We will use that formula and see. Celsius converted to Kelvin.
20o C = 293.15 Kelvin
40o C = 313.15 Kelvin
KEavg = 3/2RT
KE = 3/2(8.315 J/mol*K)(293.15 K)
= 3656 Joules
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The average kinetic energy increased about 8% in value.
Why is kinetic energy the answer for energy of motion?
Kinetic energy is the energy of motion because it is associated with the motion of an object based on its velocity and mass. The faster an object is moving or the heavier it is, the more kinetic energy it possesses. This energy is converted into other forms during interactions like collisions.
How do you move people with chi?
Techniques like Qigong and Tai Chi are believed to channel and manipulate one's chi energy for various purposes, like promoting healing or improving wellness. However, physically moving someone using chi energy alone is not a documented or proven ability.
You can find the speed of the block using the equation of motion: v^2 = u^2 + 2as, where v is the final velocity, u is the initial velocity, a is the acceleration, and s is the displacement. Given that u = 0.5 m/s, x = 3 cm = 0.03 m (displacement), and a is constant, you can calculate the final velocity v when the block reaches x = 3 cm.
Where would the rock climbers at the top have to be to have half as much potential energy?
The rock climbers would have to be halfway up the climbing route to have half as much potential energy. This is because potential energy is directly proportional to the height, so being halfway up would result in half the potential energy compared to being at the top.
Why is average kinetic energy used when discussing the kinetic energy of a collection of particles?
Average kinetic energy is used when discussing the kinetic energy of a collection of particles because it represents the energy per particle in the system. It provides a way to compare the overall kinetic energy of systems with different numbers of particles. Calculating the average kinetic energy allows for a simpler analysis of the system's overall behavior.
The kinetic energy comes from potential energy, which he got from ATP energy, which is produced through food. Potential energy is converted to kinetic energy after the muscles contract and relax.
Sources:
School science
How do you find displacement when you only have acceleration initial velocity and final velocity?
You can use the equation: Displacement = (final velocity squared - initial velocity squared) / (2 * acceleration). Plug in the values of final velocity, initial velocity, and acceleration to calculate the displacement.
Does a body in circular motion have kinetic energy?
Yes, a body in circular motion does have kinetic energy. This kinetic energy is known as rotational kinetic energy and depends on factors such as the mass of the object, its radius of rotation, and its angular velocity.
How do you calculate kinetic energy with mass and velocity?
Kinetic energy = 1/2 (mass) (speed)2
2 x kinetic energy/mass = (speed)2
Speed = square root of ( 2 x kinetic energy/mass )
mph stands for miles per hour. So to convert to kph (kilometers per hour), one has to recall that 1 mile is approximately 1.600 km, and then 75 mph = 75x1.600 = 120.0 kph.
