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- A ball is fired from a cannon into the air at a 45° angle. What shape will the cannonball's path follow? A. parabola B. circle C. ellipse D. horizontal lineA child on a merry-go-round is moving with speed 4 m/s ina circle with radius 3m. the child's mass is 39 kg , what is the centripetal force? Calculate the answer to one decimalchoose all that apply to centripetal force. A. twice the radius needs half the centripetal force. x B. Gravitational and electrical forces can produce centripetal forces. C. Twice the speed needs four times the centripetal force. D. Centripetal force depends on the mass, tangential speed and radius of the curvature. E. Centripetal force depends on tangential spreed and radius of curvature . F. Measured in the units of N or kg m/s^2 G. Any type of force directed towards a fixed center. I chose everything except answer E and got it wrong.
- What would be the mass of a 60-kg astronaut on a planet with the same density as Earth and having twice Earth's radius? a.240 kg b. 120 kg c. 60 kg d. 30 kgAn object moving at 36 m/s makes a circle with 1.2m radius.What is the object’s acceleration? Round the answer to one decimalAn object moving at 34 m/s makes a circle with 1.3m radius? What is the object's acceleration? Round the answer to one decimal