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A ball is whirled on the end of a string in a horizontal circle of radius R at speed v. By which one of the following means can the centripetal acceleration of the ball be Increased by a factor of 1.5 (or 3/2)? Hint: Centripetal acceleration, de = 4x- R R. or ac 72 Note: T is the period O Keep the radius fixed and increase the speed by a factor of two O Keep the radius fixed and increase the period by a factor of three O Decrease the radius by a factor of 3 and increase the speed by a factor of two O Increase the speed by a factor of two and decrease the radius by a factor of two O Increase the radius by a factor of six and increase the period by a factor of twoA passenger inside a train moving at a constant speed throws a ball straight up. How does the trajectory of the ball appear to some one standing outside on the train station platform? O the ball appears to follow a hyperbolic path. O the ball appears to follow a trajectory that is straight up and down in the vertical direction. O the ball appears to follow a trajectory that is straight across in the horizontal direction. O the ball appears to follow a parabolic trajectory. O the ball appears to follow a straight line that is angled at 45* with respect to the horizontal.A baseball is hit upward and travels along a parabolic arc before it strikes the ground. Which one of the following statements is TRUE? O The y-component of the velocity of the ball is zero when the ball is at the highest point in the arc. O The acceleration of the ball decreases as the ball moves upward. O The acceleration of the ball is zero when the ball is at the highest point in the arc. O The x-component of the velocity of the ball decreases throughout the ball's flight. O The velocity of the ball is a maximum when the ball is at the highest point in the arc.An eagle is flying due east at 18 m/s carrying a gopher in its talons. The gopher manages to break free at a height of 40 m. What is the magnitude of the gopher's velocity as it reaches the ground? Note: effects of air resistance are not included in this calculation.An airplane traveling north at 520 m/s is accelerated due east at a rate of 30 m/s for 13 s. If the effects of air resistance and gravity are ignored, what is the final speed of the plane