13. 2.8 Spy Hunter 8 Special Agent Smith is aboard a secret government train which is moving at a constant speed of 13.5 m/s having just retrieved an experimental explosive from some enemy spies. However, the explosive has been activated with no way to turn it off. Smith runs at a speed of 4.2 m/s toward the back of the train. When she reaches the middle of the last car, while she is still running, Smith throws the explosive at an angle which she observes to be 68° with the track. Just after reaching the peak of its trajectory, the explosive explodes extremely dramatically. A reporter watching the scene unfold from the side of the tracks observes the explosive moving vertically with no horizontal motion (i.e. there is no velocity in the x-direction from the perspective of the reporter). How high does the reporter see the explosive rise? Give your answer in m. Enter answer here 14. 2.9 Astronaut Heart Rate 9 A space station is in a far orbit travelling at 100, 000 m/s relative to a hospital on Earth. An instrument in the hospital measures a low heartrate of 40 bpm for an astronaut on the space station. What is the astronaut's heart rate in bpm in their own reference frame? Enter answer here 8. 2.5 Trapeze 5 You are the receiver in a trapeze duo and you are practicing your timing. Your partner, the jumper, releases when his swing is at 45 deg so that he flies through the air at a speed of 3 m/s. You catch him at the top of his trajectory and when your swing is also at 45 deg. The swings are identical and follow the same trajectory from -45 deg to +45 deg. How much later must you begin your swing than your partner to complete the stunt? Plese give your answer in s. Enter answer here 9. 2.6 Elliptical Comet 6 A comet moves in an elliptical orbit, so its position vector is: r = a cos (wt)î + b sin (wt)ĵ. Enter an expression for the speed at a time ½½ of the period after t = 0. For the angular frequency symbol type "Omega". Preview will appear here... Enter math expression here