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- A rotating fan blade completes 20.0 revolutions per second. The tip of the fan blade is at a radius of 15.0 cm from the centre of the blade. a) What is the total distance travelled by the blade tip in one revolution? b) What is the tip's speed? c) What is the magnitude of uie tip's centripetal acceleration?Three kids in a parking lot launch a rocket that raises into the air along a 380-m long arc in 40s. Determine its average speedA stone at the end of a sling is whirled in a vertical circle of radius 1.00 m at a constant speed Yo = 1.10 m/s as in the figure. Thecenter of the string is 1.50 m above the ground 1.What is the range of the stone if it is released when the sling is inclined at 30.0° with the horizontal at A? 2.
- In 1999, Robbie Knievel was the first to jump the Grand Canyon on a motorcycle. At a narrow part of the canyon (69.0 m wide) and traveling 35.8 m/s off the takeoff ramp, he reached the other side. What was his launch angle?Explain why centripetal acceleration changes the direction of velocity in circular motion but not its magnitude.A particle’s centripetal acceleration is aC=4.0m/s2 at t=0s . It is executing uniform circular motion about an axis at a distance of 5.0 m. What is its velocity at t=10s ?
- In an attempt to escape a desert island, a castaway builds a raft and sets out to sea. The wind shifts a great deal during the day, and she is blown along the following straight lines: 2.50 km and 45.0 north of west, then 4.70 km and 60.0 south of east, then 130 km and 25.0 of west, then 5.10 km due east, then 1.70 km and 5.00 east of north, then 7.20 km and 55.0 south of west, and finally 2.80 km and 10.0 north of east. Use the analytical method to find the resultant vector of all her displacement vectors. What is its magnitude and direction?H.W: A ball is thrown with an initial speed vgat an angle 0 below the horizontal from rooftop 44m above the ground. It lands 2sec later at a point Vor 32m from the base of the building. Find vo and 0 Ans. 0 = -37.32v. = 20. 1m/s %3D 32H.W: A ball is thrown with an initial speed voat an angle 0 below the horizontal from rooftop 44m above the ground. It lands 2sec later at a point Vor 32m from the base of the building. Find vo and 0 Ans. 0 = -37.32v, = 20. 1m/s 44oy H.W: A ball thrown up from a rooftop of height 40m lands on ground in 4s. (a)what is its maximum height above the ground? (b)what is its velocity 15m below the rooftop? Ans. (a)44.7m (b) v = -19.65 4
- H.W: A ball is thrown with an initial speed voat an angle 0 below the horizontal from rooftop 44m above the ground. It lands 2sec later at a point Vor 32m from the base of the building. Find v, and 0 Ans. 0 = -37.32v, = 20. 1m/s %3D 44yA ball is shot with a velocity of 36 m/s at an angle of 67o from the top of a 23 m tall building. What is the horizontal distance the ball travels when it hits the ground?1110. In Fig. P-1109, a ball thrown down the incline strikes it at a distance s 254.5 It. If the ball rises to a maximum height h 64.4 ft above the point of release, compute its initial velocity vo and inclination 6. Ans. v. = 80.5 ft per see; 0= 53.1° FIG. P-1109 and P-1110.