• Part A ding wheel 0.33 m in diameter rotates at 2700 rpm . Calculate its angular velocity in rad/s. Express your answer using three significant figures. ? rad/s Submit Request Answer Part B What is the linear speed of a point on the edge of the grinding wheel? Express your answer to two significant figures and include the appropriate units. HÀ ? Value Units Submit Request Answer Part C What is the acceleration of a point on the edge of the grinding wheel? Express your answer to two significant figures and include the appropriate units.

Answer Requested The graph of a proportional relationship is a straight line that passes through the origin: y = Cx 4C- When we double x, y doubles as well. 2C- 2 Notice that when the x value increases by 1, the y value increases by C·1, and when the x value increases by 2, the y value increases by C. 2. 1 In the graph that you just drew, C = 1/2. Therefore, when the x value increases by 1, the y value increases by 1. How much does the y value increase when the x value is increased by 3? For the following parts, use the fact that when an object is moving at constant velocity, position s and time t are related by s = vt + so , where v is the speed of the object and so is the position at time zero in the chosen coordinate system. Part B You wave goodbye to a friend after physics class, and she rides off on her bike. After 3.0 s, she is 15 m away. How far away will she be after 30 s ? Express your answer in meters to two significant figures. View Available Hint(s) Πνα ΑΣφ ? m

Note: this problem does not require a kinematics table, as it does not involve the angular velocity changing at all. Both answers only require a single equation which you can find in your book. 3. The tire of a car has a radius of 0.26m. As the car travels down the street, the wheel spins with an angular velocity of w-80rad/s. a. How ow many times does the wheel spin per second? b. How fast is a point on the edge of the tire moving, in meters per second? (Incidentally, this is equal to the speed of the car as it drives down the road.)

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Question 4 An object of mass 6.4 kg is traveling in a circle of radius 7.8 m at a speed 14.4 m/s. What is its centripetal acceleration? Answer in m/s2 to one decimal place. Your Answer: Answer units D Add attachments to support your work Question 5 An object with a mass of 2.0 kg is traveling in a circle with a centripetal force of 10.2 N. The radius of the object's motion is 8.4 m. What is the object's acceleration? Answer in m/s? to one decimal place. Your Answer:

An objects angular acceleration factor is Sean if the objects rotation is slowing down which of the following could be its angular velocity vector? Choose all that apply

time of 5 rotations (16.5 s) Time of 1 rotation (3.3 s) Distance from shoulder to elbow (20.32cm) Distance from shoulder to middle of hand (56.99cm)   A. What was the average angular speed (degrees/s and rad/s) of the hand? B. What was the average linear speed (m/s) of the hand? C. Are the answers to A and B the same or different?

Let's begin with the angular acceleration of a compact disk (CD). To play music the CD must rotate at high speed while a laser reads data encoded in a spiral pattern on the disk. The disc has radius R = 6.0 cm = 0.060 m; when data are being read, it spins at 7200 rev/min. What is the CD's angular velocity w in radians per second? How much time is required for it to rotate through 90° ? If it starts from rest and reaches full speed in 4.0 s, what is its average angular acceleration? Figure 02 Δθ = 900 w= 7200 rev/min R = 0.060 m 1 of 1 0₁ SOLVE To convert the disc's angular velocity w to radians per second, we multiply by (1 min/60 s) and by (2π rad/1 rev): (1 min) (2π rad 1 rev From the definition of angular acceleration (Cav rest), the average angular acceleration is Part A - Practice Problem: W= From the definition of angular velocity (w = A0/At), we find the time At for the disc to turn through 90° (π/2 rad): π/2 rad 754 rad/s Aw/At), if the disc reaches a final angular velocity of…

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