Rotaci0n

A coin of mass 25 grams is placed 20 cm from the center on a rotating turntable. The coin does not slip while the platform rotates at a constant angular speed of 40 rpm.

Which of the following answer correctly illustrates the direction of the coin's linear velocity at the instant it is at the position shown in the diagram above?

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A coin of mass 25 grams is placed 20 cm from the center on a rotating turntable. The coin does not slip while the platform rotates at a constant angular speed of 40 rpm.

What is the magnitude of the coin's linear velocity in m/sec?

A coin of mass 25 grams is placed 20 cm from the center on a rotating turntable. The coin does not slip while the platform rotates at a constant angular speed of 40 rpm.

What would be the magnitude of the acceleration experienced by the coin in m/sec²?

A coin of mass 25 grams is placed 20 cm from the center on a rotating turntable. The coin does not slip while the platform rotates at a constant angular speed of 40 rpm.

Which of the following answer correctly illustrates the direction of the coin's acceleration at the instant it is at the position shown in the diagram above?

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A coin of mass 25 grams is placed 20 cm from the center on a rotating turntable. The coin does not slip while the platform rotates at a constant angular speed of 40 rpm.

If the coefficient of static friction between the coin and the surface is 0.65, what would the greatest rotational speed the turntable could acquire and still have the coin stay in place?

A coin of mass 25 grams is placed 20 cm from the center on a rotating turntable. The coin does not slip while the platform rotates at a constant angular speed of 40 rpm.

If the first coin were to be replaced with a larger coin made of the same material, which of the following statements is true?

• the larger coin will fly off at a tangent

• the larger coin will remain at rest as well

• the larger coin will fly off along the radius

• the larger coin will spiral in towards the center of the turntable

A ball of mass m is being whirled counterclockwise in the vertical circle of radius r as shown below.

 Which expression below correctly describes the magnitude of the critical velocity needed by the bob in order to pass through point C and not leave its circular path?

A ball of mass m is being whirled counterclockwise in the vertical circle of radius r as shown below.

What would be the tension in the string at point C if the ball were to be traveling at twice its minimal, critical velocity?

A ball of mass m is being whirled counterclockwise in the vertical circle of radius r as shown below.

Suppose after several revolutions, the string suddenly breaks while the bob is passing through point B. Which of the following statements correctly describes the bob's motion after the strong breaks?

• the mass follows a parabolic trajectory taking it upwards and to the left

• the mass rises vertically straight up and then falls back towards the ground along the same vertical path

• the mass follows a parabolic trajectory taking it upwards and to the right

• the mass immediately falls straight downward

In which method of rotation does the deck of cards have the greatest moment of inertia?

• the one that would spin about the horizontal axis

• the one that would spin about the vertical axis

• they have the same moment of inertia