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- If an airplane is flying at 140 miles per hour east and turns in a smooth curve with a diameter of 3 miles, what is its centripetal acceleration in m/s2 ? SYW!!!A baseball player throws a ball at a 40° angle to the ground. The ball lands on the ground some distance away.a. Is there any point on the trajectory where vu and au are parallel to each other? If so, where?b. Is there any point where vu and au are perpendicular to each other? If so, where?17
- An airplane propeller is rotating at 1900 rpm (revolutions per minute). How many seconds does it take for the propeller to turn through 35o?A runner runs around a circular track. He completes one lap at a time if t=497s at a constant speed of v=3.9m/s. What is the radius r in meters of the track?what was the runners centripetal acceleration ac in m/s^2 during the run?A 10 m/s В A 1000-kg Jeep travels along a straight 500-m portion of highway (from A to B) at a constant speed of 10 m/s. At B, the Jeep encounters an unbanked curve of radius 50 m. The Jeep follows the road from B to C traveling at a constant speed of 10 m/s while the direction of the Jeep changes from east to south. ... 50 m N C W E S What is the magnitude of the acceleration of the Jeep as it travels from B to C? A 10 m/s? в) 5 m/s? C 20 m/s2 D 2 m/s2
- = 4bdd655af6baf8ca630f9c91581eb955.pdf 2 1 2 2/2 Expo Fultsche 3. Speed Limits on Highway and Road Curves Scenario: Imagine a car travelling along a highway at 100 km/h [East] on a cold winter day. The car approaches an off ramp so the driver can turn south off the highway but as the car enters the curve it hits a patch of ice. i) Describe the initial motion of the car. ii) If the car begins to skid when it hits the ice, describe the motion of the car as the driver attempts to enter the curve. The faster the car is going initially, the greater the force required to get it to turn from its initial direction to a new direction. iii) Explain why highway designers usually post signs similar to the one below on tight curves and on/off ramps on roads and highways. 65 ↓e = 0, + wot +at? S = Or w = wo + at v = wr w? = w; + 2a(0 – 0.) atan = ar, a. %3D Tcom - (m,F + m2; + mz73 + .·) 1= E¡m;r? Mtotal An ultracentrifuge accelerates from rest to 9.93 x 10° rpm in 1.87 min. What is its angular acceleration in radians per second squared? angular acceleration: rad/s? What is the tangential acceleration of a point 8.90 cm from the axis of rotation? tangential acceleration: m/s? What is the radial acceleration in meters per second squared and in multiples of g of this point at full revolutions per minute? radial acceleration: m/s? radial acceleration in multiples of g:At takeoff, a commercial jet has a speed of 68 m/s. Its tires have a diameter of 0.88 m. a. At how many rev/min are the tires rotating? b. What is the centripetal acceleration at the edge of the tire in m/s2 c. With what force must a deterimned 1.15 * 10-15 kg bacetrium cling to the rim in N? d. Take the ratio of this force to the bacterium's weight