College Physics
11th Edition
ISBN: 9781305952300
Author: Raymond A. Serway, Chris Vuille
Publisher: Cengage Learning
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- A particle has mass 20 g moving counterclo ckwise )عکس عقارب الساعه( in uniform circular motion about the origin of an xy coordinate system, It takes the particle 10 s to complete one full cycle. At one instant, its position vector (measured from the origin) is r= 4 i+ 3 J. At that instant, what is the 5 * ?? (velocity vector (in m/s v = 1.2 i + 1.8 J O v = -1.2 i + 1.8 JO v = 1.8 i + 1.2JO v = -1.8 i + 1.2 J O v = -1.8 i-1.2 J O v = 1.2 i - 1.8 J كلية العلوم v = 1.8 i - 1.2 J Oarrow_forwardA car passes point A of the circular path with a radius R = 50 m, with a speed of 20 m/s and accelerates at a constant 10 m/s². са a) Find the speed of the car at B b) Find the total acceleration of the car at B c) Compute the arc distance s measured from A and the arc angle o where the car has a speed of 40 m/s (twice the initial speed at A) d) At what time does the car have a speed of 40 m/s IB IRarrow_forwardA skateboarder rolls upward along a curved ramp, as shown in the diagram, and reaches the highest point thatis a vertical height of 7.5 m above the base of the ramp. (a) What would the initial speed at the base of the ramp (point A) required for the skateboarder to reachthe top of the ramp be? (b) What is the skateboarder’s speed at the point that is 1.1 m vertically above the base of the ramp?arrow_forward
- In the very Dutch sport of ducth-dude-on-a-pole, athletes run up to a long pole and then use it to vault across a canal. At the very top of his arc, a 70kg vaulter is moving at 3.5m/s and is 5.0m from the bottom end of the pole. What force would the vaulter exert on the pole (in magnitude)?arrow_forwardThe sprinter begins from rest at position A and accelerates along the track. If the stationary tracking camera at O is rotating at the rate of 18.5 deg/s when the sprinter passes the 45-m mark, determine the speed v of the sprinter and the counterclockwise value of r. Calculate the component of the velocity in the 8-direction. S 31 m Answer: Ve= 1 m/s Ve Ө 14 m e o e,arrow_forwardSolve all parts , i vll upvote , Asap plzzzarrow_forward
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- A placekicker is attempting to make a 54-yard field goal. If the launch angle of the football is 33°, what is the minimum initial speed u which will allow the kicker to succeed? u Ꮎ 54 yd Not to scale 10'arrow_forwardAn object is tied to a string of length 1.00 m and is rotated in clockwise directionin a vertical circular path. The string breaks when the object is moving at a speedof v0= 15.0 m/s at point A, as shown in the figure. The center of the circle is 4.00 m fromthe ground. How long will it take for the object to hit the groundarrow_forwardA ball of mass 4.7 kg and a diameter of 68.2 cm is attached to a string of length 1.1 m. It moves in a circular path at constant speed, 3.0 m above the ground. The string makes a constant angle of 17 ° with respect to vertical. L m (a) What is the speed of the ball? (b) What is the tension in the string?arrow_forward
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