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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

How do you find average acceleration of an object?

a = w2r = v2/r

where

a is acceleration

w is angular velocity

r is radius of orbit

v is velocity.

Is a river potential or kinetic energy?

Both, if you refer to a flowing stream. The topographic elevation of the streambed above the base level toward which it leads (e.g., sea level) is indicative of the potential energy of the water in the river. (Another kind of potential energy is proportional to the water depth above the streambed.) The river's kinetic energy is proportional to the square of its current velocity and to the mass of moving water. Remember KE = (m v^2)/2 from physics?

If the river ceases to flow, for example enters a lake or impoundment, its kinetic energy will decrease to zero. Yet because of potential energy, its water may still have considerable energy.

How many meters per second can usain boldt can run?

Usain Bolt's fastest recorded speed is about 12.27 meters per second, achieved during his world record-setting 100m sprint in 2009.

What is the terminal velocity of a falling cricket ball and how high would it need to be hit in order to reach that velocity?

As an avid experimenter and paraglider pilot the question of how fast an object reaches terminal velocity has been tested a few times by our fellow pilots.

In fact one 'person' actually hollowed out a cricket ball and installed a miniture vario to record the 'flight curve'.

The ball was re-weighted to allow for the hollowed out section so it was the same as an un holled ball.

Air density was 1013-1011 during the half hour flight.

Altitude dropped from was 2000ft above field.

Max speed came out at a little over 35m/s ( about 80mph).

Interestingly the speed did vary 3 or 4 mph during the terminal velocity period.

We put that down to the ball turning and the seam presenting itself in different angles to the air flow and changing the Cd. (also it was an oldish slightly scuffed ball, so maybe a new polished one may travel a few mph faster)

Thats the closest I get to cricket !

Hope this info is of use to some of the out fielders.

Im off to find another cloud.

What is the sum of potential and and Kinetic energy?

The sum of potential and kinetic energy is the total mechanical energy of an object. This total energy remains constant in the absence of external forces, according to the principle of conservation of mechanical energy.

Which device converts electric energy into rotational kinetic energy?

An electric motor is the device that converts electric energy into rotational kinetic energy. It works by using magnetic fields to generate a rotational force, which causes a shaft to rotate and perform mechanical work.

The work done by gravity during the descent of a projectile motion is?

Zero, assuming there is no air resistance. Gravity does not do work in the horizontal direction during the descent phase of projectile motion because the force of gravity and the displacement are perpendicular to each other, resulting in no work being done by gravity.

A object has one joule of potential energy explain what does it means?

We know that energy is defined as the ability to do work.So an object has one joule of potential energy means that the body has capability to do a work of one joule.

We may say that the object with 1 joule of potential energy is the force field and our work is stored in displacing the object against the field

How does cold affect kinetic energy?

Cold temperatures decrease the kinetic energy of particles because they have less thermal energy to move around. As temperature decreases, the particles move more slowly, resulting in a reduction in their kinetic energy.

If two objects collide they each have the same momentum as they had before the collision?

The momentum of this case is equal to the summation of cross product of mass and velocity of both. How ever after the collision, some energy is converted into other form like sound and heat. This phenomena caused the momentum efficiency (e)

In this case (masses are equal), e is equal to the ratio of the velovities summation of both masses between after and before hitting each other.

e = ((V1'+V2')/(V1+V2));

Amy skates110 yards per minute what is her speed in miles per hour?

To convert yards per minute to miles per hour, we can use the following conversions: 1 mile = 1,760 yards and 1 hour = 60 minutes. Amy's speed in miles per hour would be 7.5 mph (110 yards/minute * 60 minutes/hour / 1,760 yards/mile).

How can you find kinetic energy?

Heat is just the measure of the average kinetic energy of the molecules in... whatever you are measuring. Kinetic energy is s form of energy, so the fact that the molecules have kinetic energy proves heat is energy. Also heat powered engines do work by converting heat into kinetic energy.

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Thanks for that. But how do you prove that heat is a form of energy ?

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How does velocity have an effect on kinetic energy?

The summation of potential and kinetic energy of an object is constant. When the potential energy of an object decreases the kinetic energy increases. Assume a falling stone from some high point above ground. At the beginning, the potential energy is maximum while the kinetic energy is minimum or zero. While the stone is falling, the kinetic energy increases while the potential energy increases (with the summation of both is constant). When the stone reaches the ground, the kinetic energy is maximum and the potential energy is zero.

What is slow speed?

Slow speed refers to a lower rate or pace of movement or operation in comparison to normal or expected speeds. This can apply to various contexts, such as internet connection, vehicle travel, or processing time of a system or device.

How does distance affect accuracy?

Distance can affect accuracy in different ways depending on the context. In general, the farther the distance, the more difficult it may be to maintain accuracy due to factors like reduced visibility, targeting errors, or environmental conditions. However, some technologies or techniques can help mitigate these challenges at longer distances.

What is 300KH in mph?

300 kilometers per hour is equivalent to approximately 186.4 miles per hour.

What will happen if a parachutist opens its parachute before reaching its terminal velocity?

During free fall, the parachutist reaches a terminal velocity (a constant velocity) of somewhere between 120 and 180 miles per hour. (If you go feet first, you go faster than if you lie on your back or front). When the parachute opens (hopefully), the terminal speed is reduced to around 12 miles/hour.

How do you convert 21 meters per second to mph?

To convert 21 meters per second to mph, you can use the following conversion factors: 1 meter per second is approximately equal to 2.237 mph. Therefore, 21 meters per second is approximately 47.25 mph.

Whas is the top speed Quadzilla 450 sport r?

top speed of a quadzilla 450 with a 15 tooth front and a 36 tooth rear sprockets are 86 mph as i have just upgraded mines and thats what she does,it also cuts the revs right down its not screaming its head off anymore

How can you find the kinetic energy without velocity in the question?

To find kinetic energy without velocity, you can use the formula for kinetic energy, which is KE = 0.5 * m * v^2, where m is the mass of the object and v is the velocity. If velocity is not given, you will need additional information, such as the height from which an object falls (in the case of gravitational potential energy) or the force applied over a distance (in the case of work-energy theorem), to calculate kinetic energy without velocity.