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Pendulum height

Pendulum height. 1. How high will pendulum rise? A) Less than h B) h C) More than h. h. Reference level (h = 0). 2. A 5000 kg coaster is released 20 meters above the ground on a frictionless track. What is the approximate speed at ground level? (point A). Velocity from PE. 7 m/s

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Pendulum height

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  1. Pendulum height 1. How high will pendulum rise? A) Less than h B) h C) More than h h Reference level (h = 0)

  2. 2. A 5000 kg coaster is released 20 meters above the ground on a frictionless track. What is the approximate speed at ground level? (point A) Velocity from PE • 7 m/s • 10 m/s • 14 m/s • 20 m/s • none of the above

  3. 3. What is its approximate speed at 10 meters high (point B )? A)7 m/s B)10 m/s C)14 m/s D)20 m/s E)none of the above

  4. 4. How fast would the coaster have to be going at the start to reach 21 meters high (point C)? • A)1.1 m/s • B)  3.2 m/s • C)  4.5 m/s • D)   20 m/s

  5. Pendulum speed 5. Calculate velocity at B if h = 0.45 m, g = 10 m/s2 A) 3 m/s B) 4.5 m/s C) 7.5 m/s D) 9 m/s A h B Reference level (h = 0)

  6. CQ1 PE to KE from Dubson/Tanner 6. A block initially at rest is allowed to slide down a frictionless ramp and attains a speed v at the bottom.  To achieve a speed 2v at the bottom, how many times higher must the new ramp be? A)      B) 2     C) 3     D) 4   E) none of these. v

  7. 6. A block initially at rest is allowed to slide down a frictionless ramp and attains a speed v at the bottom.  To achieve a speed 2v at the bottom, how many times higher must the new ramp be? A)      B) 2     C) 3     D) 4     E) none of these. CQ 6 Show work mghtop + 0KE + 0work = 0PEg +1/2 mvbottom2 First ramp:htop vbottom2 2nd ramp: h'top  (2vbottom)2 = 4 (vbottom2) h'top = 4htop

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