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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
What is the speed in meters per second travelling at 20 knots?
20 knots is equivalent to approximately 10.29 meters per second.
What is 900 feet per day converted into yards per hour?
To convert 900 feet per day to yards per hour, we first need to find the equivalent value in yards for 900 feet. Since 1 yard is equal to 3 feet, 900 feet is equal to 300 yards. Next, we convert the rate from days to hours by considering there are 24 hours in a day. Therefore, 300 yards per day is equivalent to 12.5 yards per hour.
What happens to an object's potential energy as it gains kinetic energy?
As an object gains kinetic energy (movement), its potential energy decreases. This is because the energy is being converted from potential energy to kinetic energy. The total mechanical energy of the object (kinetic energy + potential energy) remains constant if no external forces are acting on the object.
450 knots is approximately equal to 518.34 miles per hour.
Is kinetic energy of a body in motion equals the product of half its acceleration?
No. Kinetic energy is 1/2 times mass times velocity squared - so as you can see, acceleration doesn't even enter the equation. If it accelerates, the speed will change, though, and so will its kinetic energy.
The "stored energy", or potential energy, will be converted to kinetic energy.
Example:
Let U = gravitational potential energy, K = kinetic energy
U = mgh, where m is mass, g is theaccelerationdue to gravity, h is the height
(there are other types of potential energy, but this is the most common example)
K = 1/2mv2, where v is velocity
Set U equal to K, because that potential energy will be converted to kinetic energy, minus any other factors that "steal" energy (i.e., friction):
U = K
mgh = 1/2mv2 <-- masses cancel
gh = 1/2v2
The left side of the equation represents stored energy. The right side represents kinetic energy. If we increase the left side by a factor of A, we must increase the right side by a factor of A as well (it's just an algebraic step):
A(gh) = A(1/2v2)
So it should be visible, that if you if you increase potential energy, you also increase kinetic energy (by the same proportion).
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Can an object have a constant speed and the varying velocity at the same time explain?
Velocity is a vector. A vector has a magnitude and a direction. The scalar or magnitude portion of velocity is speed. Velocity is a constant only when both the speed and direction are not varying. Hence, when the speed is changing, the velocity cannot be a constant.
215 mph is equivalent to approximately 346 km/h or 94.7 m/s. This speed is extremely fast and typically associated with high-performance vehicles like sports cars or racing cars.
How do you develop the general velocity equation from a Velocity vs Time graph?
Derivitives of a velocity : time graph are acceleration and distance travelled.
Acceleration = velocity change / time ( slope of the graph )
a = (v - u) / t
Distance travelled = average velocity between two time values * time (area under the graph)
s = ((v - u) / 2) * t
What is the mph that breaks the sound barrier?
The speed of sound is approximately 767 mph, so any speed faster than that would break the sound barrier. Typically, speeds exceeding around 760-770 mph are considered supersonic.
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Yes. For the object not to move, two conditions must be satisfied: (1) The vector sum of forces must be zero, and (2) The vector sum of torques must be zero.
Do some reading on torque, for more information.
How many mph does a rocket ship go?
Rocket ships can travel at speeds ranging from 25,000 to 36,000 miles per hour (40,000 to 58,000 kilometers per hour) depending on the mission and type of rocket.
Why is a rock on the top of a hill kinetic energy?
A rock on top of a hill has potential energy, not kinetic energy.
If it starts rolling down the hill then the potential energy transforms to kinetic energy.
Which is greater in positive acceleration initial or final velocity?
In positive acceleration, the final velocity is greater than the initial velocity. This is because acceleration is the rate of change of velocity, so as time progresses, the velocity increases due to the acceleration.
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Yes, it is possible. For example, if a particle moves back and forth between two points with different speeds, such that the time spent at each point is unequal, the average speed would not be zero even though the particle's speed is zero at each point.
What energy is in a kicked football?
A kicked football has, of course, kinetic energy. As it moves up, its vertical movement provides potential energy. Until it goes up to its maximum displacement from the ground, its potential energy is at 100% while the kinetic energy doesn't exist. As the football moves back down, its potential energy is decreasing, but kinetic energy is increasing because there's movement in the football
Is 30 miles per hour is less than 60 km per hour?
1 mile = 1.6 km
Convert miles to kilometers by multiplying miles x 1.6km/mi.
30mi x 1.6km/mi = 48km
30mi/h = 48km/h
30mi/h is less than 60km/h.
Is radiation is a form of kinetic energy?
Radiation is a form of energy that includes both kinetic and electromagnetic energy. Kinetic energy refers to the energy of moving particles in radiation, such as in the case of alpha or beta particles. Electromagnetic energy refers to the energy carried by waves, like gamma rays.
Why is average in kinetic energy so important?
The average kinetic energy of particles in a substance is directly related to its temperature. Understanding this average kinetic energy helps us predict how the substance will behave in various conditions, such as changes in temperature or phase transitions. This knowledge is crucial in fields like thermodynamics and materials science.
Is a hammer held above a nail kinetic energy?
No, a hammer held above a nail has potential energy due to its position relative to the nail. Potential energy is energy that an object has due to its position or state, whereas kinetic energy is energy of motion.
