# What is angular velocity?

Angular velocity is a measurement of how fast something is turning. Everyone has heard of "RPM", which stands for "Revolutions Per Minute" ... how many complete turns an ob…ject makes in one minute. That's a perfectly good measurement of angular velocity, although in Physics, angular velocity is normally given in different units. The standard unit for angular velocity is "radians per second". Each complete turn covers (2 pi) radians (same as 360 degrees). And there are 60 seconds in one minute. So if you know the RPM, you can multiply RPM by (2 pi / 60) = 0.10472 to get angular velocity in standard units. An old LP phonograph record (remember those ?) playing at 33-1/3 RPM has an angular velocity of about 3.5 radians per second. A car engine idling at 1,000 RPM is turning at about 104.7 radians per second.

# What is the angular velocity of the earth around its own axis?

Approximately 33K miles/hr.

# What direction is the earth's angular velocity for its daily rotation on its axis?

\nThe earth rotates counter clockwise when looking down on the North pole; everything proceeds to the east. \n.
\nIn terms of vectors, this means the angular velocity vector …for the earth points straight up along the earth's center axis, following the "right hand rule" where your fingers curl around in the direction of rotation and your thumb points in the vector's direction.

# What is the angular velocity of the earths rotation?

It takes the Earth approximately 23 hours, 56 minutes and 4.09 seconds to make one complete revolution (360 degrees). This length of time is known as a sidereal day. The Earth… rotates at a moderate angular velocity of 7.2921159 Ã 10 -5 radians/second

# At what angular velocity would the earth have to rotate about its axis for a body at the equator to feel no weight?

You can calculate it yourself, with the formula for acceleration in uniform circular motion. The centripetal acceleration, with circular motion, is v 2 / r (velocity squared …divided by the radius). Since the Earth's gravitation is about 9.8 meters per second square, solve the equation v 2 / r = 9.8, for variable v. r (radius, of the Earth) should be converted to meters. The velocity will be in meters per second. Note that this exercise assumes the Earth is rigid. In practice, if Earth really rotated that fast, it would flatten out a lot, and in fact be torn apart. You can calculate it yourself, with the formula for acceleration in uniform circular motion. The centripetal acceleration, with circular motion, is v 2 / r (velocity squared divided by the radius). Since the Earth's gravitation is about 9.8 meters per second square, solve the equation v 2 / r = 9.8, for variable v. r (radius, of the Earth) should be converted to meters. The velocity will be in meters per second. Note that this exercise assumes the Earth is rigid. In practice, if Earth really rotated that fast, it would flatten out a lot, and in fact be torn apart. You can calculate it yourself, with the formula for acceleration in uniform circular motion. The centripetal acceleration, with circular motion, is v 2 / r (velocity squared divided by the radius). Since the Earth's gravitation is about 9.8 meters per second square, solve the equation v 2 / r = 9.8, for variable v. r (radius, of the Earth) should be converted to meters. The velocity will be in meters per second. Note that this exercise assumes the Earth is rigid. In practice, if Earth really rotated that fast, it would flatten out a lot, and in fact be torn apart. You can calculate it yourself, with the formula for acceleration in uniform circular motion. The centripetal acceleration, with circular motion, is v 2 / r (velocity squared divided by the radius). Since the Earth's gravitation is about 9.8 meters per second square, solve the equation v 2 / r = 9.8, for variable v. r (radius, of the Earth) should be converted to meters. The velocity will be in meters per second. Note that this exercise assumes the Earth is rigid. In practice, if Earth really rotated that fast, it would flatten out a lot, and in fact be torn apart.

# Where does the angular velocity vector of the Earth rotation points?

Up out of the north pole. (And down into the south pole.)

# A rotating fan blade has kinetic energy when rotating with constant angular velocity when the angular velocity is reduced to one third what will happen to the kinetic energy?

It will decrease by a factor 9..
\n

# Does the blade of a fan that is turned on have angular momentum?

yeah,bcoz it moves in circle around a specific point.

# What is the angular velocity of the earths rotation direction of rotation?

The angular velocity of the earth's rotation is 7.27 Ã 10 -5 radians/second.

# An electric fan is turned off and its angular velocity decreases uniformly from 550 rev min to 200 in rev per min time interval of length 4.50 sec Find the angular acceleration in meters per sec sq?

(550 - 200) rev per minute = -350 rev per minute / 60 sec per minute = (-35/6 rev per second) change in angular velocity Angular acceleration = (change in angular velocity)… / (time for the change) = (-35/6 rev per second) x (2 pi radians per rev) / 4.5 seconds = -8.1449 radians per second 2 (" Meters per sec sq" can't be a unit of angular acceleration, since angles can't be measured in meters.)

# What is angular speed and angular velocity?

That is analogous to linear speed and velocity, but for rotation. Whereas a linear speed (or velocity) is expressed in meters per second (or some other units of distance / tim…e), the angular speed or velocity is expressed in radians / second (or some other units of angle / time). Of course, when something rotates, there is also a linear speed, but different parts of an object rotate at different linear speeds, whereas the angular speed is the same for all parts of a rotating object - at least, in the case of a solid object. For example: the Earth rotates at an angular speed of 1 full rotation / day. The linear speed at the equator is approximately 1667 km/hour; close to the poles, the linear speed is much less.

# When angular velocity decreases the direction of angular acceleration is opposite to angular velocity .why?

Take the velocity to be in positive direction. Positive acceleration increases velocity and they are in the same direction. Negative acceleration reduce velocity and they …are in opposite direction. It does not matter if the motion in linear or anfular.

Answered

In Science

# How do you increase the angular velocity of a rotating object?

Angular velocity just means how fast it's rotating. If youaa want more angular velocity, just rotate it faster ordecrease the radius (move it closer to the center of rotation)…. .
Just like force = rate of change of momentum, you have torque=rate of change of angular moment Or We can increase the angular velocity of a rotating particle byapplying a tangential force(i.e. accelaration) on the particle. Since the velocity of the particle is tangential with the circlealong which it is moving, the tangential accelaration will notchange the diriction of the velocity(as angle is 0),but will causea change in magnitude. Thus angular velocity will increase.

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In Rotation

# What angular acceleration is necessary to increase the angular speed of a fan blade from 8.5 rads per second to 15.4 rads per second in 5.2 seconds?

W f - W i = a*t, where W i and W f are the initial and final angular velocities, respectively, a is the angular acceleration, and t is time. So, a*t = 15.4 rad/s - 8.5 r…ad/s = 6.9 rad/s, thus a = 6.9 rad/s / 5.2 s = 1.3 rad/s 2 .

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In Physics

# Is the direction of angular velocity always equal to the direction of angular acceleration?

No.

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In Physics

# How is the radius of rotation related to the centripetal force and angular velocity?

Assuming that angles are measured in radians, and angular velocityin radians per second (this simplifies formulae): Radius of rotation is unrelated to angular velocity. Linea…r velocity = angular velocity x radius Centripetal acceleration = velocity squared / radius Centripetal acceleration = (angular velocity) squared x radius Centripetal force = mass x acceleration = mass x (angular velocity)squared x radius

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In Uncategorized

# What is an angular velocity?

An angular velocity is the angle turned in a given time by a body rotating around an axis.