7634

Physics Circular Motion Level: Misc Level

A certain string breaks when it is subjected to 400 N of tension. A boy uses this string to whirl a 5.0-kg stone in a horizontal circle of radius 5.0 m. The boy continuously increases the speed of the stone.At approximately what speed will the string break?(Multiple Choice answer below, but of course, we have to show work)

(a) 10. m/s, (b) 20.m/s, (c) 80. m/s(d)100 m/s (1.0 x102 m/s), or (e)400 m/s (4.0 xlo2 m/s) What is the rotation rate (revolutions per minute (rpm)) of the stone just before the string breaks?

(f) 0.050 rpm, (g)0.64 rpm, (h) 1.6 rpm, (i) 38 rpm,or (j) 60 rpm


7292

Physics Circular Motion Level: Misc Level

A car is moving on a horizontal road at a constant velocity that is directed 45% south of east. What is the direction of the angular velocity of the wheels?


7289

Physics Circular Motion Level: Misc Level

Two motorcycles are riding a circular track at the same angular velocity. One is at a radius of 15 m and the second is at a radius of 18 m. What is the ratio of their linear speeds, v2/v1?


7287

Physics Circular Motion Level: Misc Level

A 0.254 diameter circular saw blade rotates at a constant angular speed of 117 rad/s. What is the tangential speed of the tip of saw tooth at edge of the blade?


7115

Physics Circular Motion Level: Misc Level

Find the centripetal force of a 10-kg mass traveling at 4.0 m/s on a curve radius of 3.0 m. (I used the following form is it right? Fc=m V th the 2 power/r)


7043

Physics Circular Motion Level: Misc Level

A car approaches a level circular curve (radius+60.0m). If the coefficient of static friction is 0.7, what is the maximum speed at which the car negotiates the curve at constant speed, without skidding?


6746

Physics Circular Motion Level: Misc Level

A point on the edge of a large wheel of radius 3 m moves through an angle of 37 degrees. Find the length of the are described by the point.

 


6290

Physics Circular Motion Level: Misc Level

A 200 g object is moving in a circle of radius 4.0 m at a uniform speed of 6.0 m/s. The net force acting on the object is:

a. 1.8 N away from the center of the circle.

b.1.8 N towards the center of the cirle.

c.3.6 N towards the center of the cirle.

d.3.6 N tangential to the cirle.


6211

Physics Circular Motion Level: Misc Level

An angular acceleration of 1200 rev/min2 when expressd in radians2 is:

a. 20 rad/s2

b. 1.2 rad/s2

c. 2.1 rad/s2

d. 0.20 rad/s2


6142

Physics Circular Motion Level: Misc Level

A wheel has eight equally spaced spokes and a radius of 34 cm. It is mounted on a fixed axle and is spinning at 1.4 rev/s. You want to shoot a 21-cm-long arrow parallel to this axle and through the wheel without hitting any of the spokes. Assume that the arrow and the spokes are very thin. What minimum speed must the arrow have?


6089

Physics Circular Motion Level: Misc Level

The uniform 12-ft pole is hinged to the truck bed and released from the vertical position as the truck starts from rest with an acceleration of 3.8 ft/s/s. If the acceleration remains constant during the motion of the pole, calculate the angular velocity of the poleas it reaches the horizontal position .Assume g=32.2 ft/s/s. Give your answer in inverse seconds


6045

Physics Circular Motion Level: Misc Level

Calculate the speed and acceleration on a point of a 15 3/4 vinyl record that has a diameter of 50.0 cm. (Note: 15 3/4 is the frequency that the record turns in RPM)


6034

Physics Circular Motion Level: Misc Level

A tire swing has a length of 1.35 m and has a person on it with weight of 659 N. If that swing is pulled back to a 45 degree, angle, what will the speed of the person be 

a) when they get to the other side of their swing.

b) when they are the right at the bottom of their swing?


5996

Physics Circular Motion Level: Misc Level

 Answer the following question (s), showing your calculations.A runner moving at a speed of 5.3 m/s rounds a curved track with a 79 -m radius .What is the runner,s centripetal acceleration?


5940

Physics Circular Motion Level: Misc Level

An angular acceleration of 1200 rev/min2 when expressed in radians/s2 is ?


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