Ex. 63: A motor car is travelling at a speed of 80 km/hr along a curve of radius 40 m. If the road is banked at an angle of 30°, will the car be safe ? (g = 9.8 m/s²).
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- = A curve that has a radius of 95 m is banked at an angle of 0 10.0°. If a 1050 kg car navigates the curve at 70 km/h without skidding, what is the minimum coefficient of static friction Ms between the pavement and the tires? Ms =A car is rounding a turn on a road that is banked at some angle with respect to the horizontal. The road is covered with ice and there is no friction between the road and the tires. which of the following forces is responsible for keeping the car on its circular path? The horizontal component of the force of gravity It is impossible for the car to stay on a circular path in this situation The vertical component of the force of gravity The horizontal component of the normal force The vertical component of the normal force Complete the following sentence. Centripetal forces enable objects to follow circular trajectories with constant speed. enable objects to follow circular trajectories with constant acceleration. O are described by Hooke's law for springs. double in magnitude when an object's speed in uniform circular motion is doubled. OOOOLife scientists use ultracentrifuges to separate biological components or to remove molecules from suspension. Samples in a symmetric array of containers are spun rapidly about a central axis. The centrifugal acceleration they experience in their moving reference frame acts as "artificial gravity" to effect a rapid separation. If the sample containers are 11.9 cm from the rotation axis, what rotation frequency is required to produce an acceleration of 1.85-105 g? Submit Answer Tries 0/99
- Civil and traffic engineers want to design a banked curve on a highway. The curve will have a 1.80 km radius and the highway's speed limit will be 70.0 mph. If every car will travel at the speed limit, what is this curve's ideal banking angle to three significant figures? NB: 1609 m = 1 mile. Hint: be careful with your units. 1.94° 2.62° 4.02° 3.18° 2.95° 15.5°A 70 kg person on a merry go round is spinning with speed 5 m/s. If they experience a centripetal force of 583N, how far from the center of the merry go round are they sitting? Express in meters.A 944-kg automobile rounds a curve at a constant speed of 35 m/s, undergoing an acceleration of magnitude 1.9 m/s2 as it proceeds. What is the radius of the curve? (Answer in m.)