79%-], Wed 10:47 A me-1-9.179.pdf (page 214 of 1,004) Q Search Chapter 4| Motion

Question

79%-], Wed 10:47 A me-1-9.179.pdf (page 214 of 1,004) Q Search Chapter 4| Motion in Two and Three Dimensions velocity 5 s after the rockets fire? e from t=0s tot e tip of the blade n from leration of the tip the axis of 92. A crossbow is aimed horizontally at a target 40 m away. The arrow hits 30 cm below the spot at which it was aimed. What is the initial velocity of the arrow? n with a constant 93. A long jumper can jump a distance of 8.0 m when he If time t = 0 takes off at an angle of 45° with respect to the horizontal. Assuming he can jump with the same initial speed at all angles, how much distance does he lose by taking off at 30°? e being located at ion of the particle time? (c) What is s ac=4.0 m/s2 r motion about an locity at t 10 s? 94. On planet Arcon, the maximum horizontal range of a projectile launched at 10 m/s is 20 m. What is the acceleration of gravity on this planet? 95. A mountain biker encounters a jump on a race course that sends him into the air at 60° to the horizontal. If he at 2.0 rev/s about al accelerations at lands at a horizontal distance of 45.0 m and 20 m below his n. launch point, what is his initial speed? (1.5j +4.0k)m 3.2 j-1.2k) m. 96. Which has the greater centripetal acceleration, a car with a speed of 15.0 m/s along a circular track of radius 100.0 m or a car with a speed of 12.0 m/s along a circular track of radius 75.0 m? 97. A geosynchronous satellite orbits Earth at a distance of 42,250.0 km and has a period of 1 day. What is the e is given by

Explanation / Answer

Problem 94)

Projectile range, R = u2 sin(2 theta)/ g

For maximum range, theta = 45°

R = u2 sin 90°/ g = u2/ g

=> g = u2/ R = 100/ 20 = 5 m/s2

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