Question

please i need hep with dynamics homework, i need it done correctly within the next few hours please i need it to pass my class questions 11-15 please

Font JULLI Abod AaBbc AaB AabCcDd daBbcc AaBbce S E 1 Caption Normal 1 No Spac... Heading 1 Title Sabtitle Subtle in Emphasis 6. Paragraph E TICE U Barry Surger n ece UF WUT LIIGITUSELE UT WUDU I VULT ROVE the same met veren your answer. 9. What properties do forces have that allow us to classify them as vectors? 10. How are inertia and mass related? How do they differ? 11. What is the relationship between weight and mass? Which is an intrinsic, unchanging property of a body? 12. Why can we neglect forces such as those holding a body together when we apply Newton's second law of motion? 13. Explain how the choice of the "system of interest" affects which forces must be considered when applying Newton's second law of motion. 14. A rock is thrown straight up. What is the net external force acting on the rock when it is at the top of its trajectory? 15. (a) Give an example of different net external forces acting on the same system to produce different accelerations. (b) Give an example of the same net external force acting on systems of different masses, producing different accelerations. (c) What law accurately describes both effects? State it in words and as an equation 16. If the acceleration of a system is zero, are no external forces acting on it? What about internal forces? Explain your answers. 17. If a constant, nonzero force is applied to an object, what can you say about the velocity and acceleration of the object? 18. When you take off in a jet aircraft, there is a sensation of being pushed back into the seat. Explain why you move backward in the seat-is there really a force backward on you? (The same reasoning explains whiplash injuries, in which the head is apparently thrown backward.) 19. An American football lineman reasons that it is senseless to try to out.push the opposing player, since no matter how hard he pushes he will experience an equal and opposite force from the other player (as stated in Newton third law). Use Newton's laws and draw a free-body diagram of an appropriate system to explain how he can stil out-push the opposition if he is strong enough. 20. To simulate the apparent weightlessness of space orbit, astronauts are trained in the hold of a cargo aircraft is accelerating downward at 9. Why will they appear to be weightless, as measured by standing on a bathroom scale, in this accelerated frame of reference? Is there any difference between their apparent weightlessness in orbit and in the aircraft? 21. Since astronauts in orbit are apparently weightless, a clever method of measuring their masses is needed to monitor their mass gains or losses to adiust diets. One way to do this is to exert a known force on an astronaut

Answer 1

Sot": - 11. weight is the product of mass and gravity i.e. we mg weight is the force due to gravity while mass is intrinsic, unchanging property, means mass never changes, it remains constant everywhere. 12. Thoose forces are pair forces, which are equal in magnitude but opposite indirection. Hence both forces cancle each other and resultant is zero. ie it is neglected 13. For Newton's second Law, we consider only the forces which act on the system, we do not considle about those forces which is applied by the systen.ie choice of system of interest affects which which forces must be consider. 14. Here only one force ie force due to gravity is acting on the rock when it is at the top of its trajectory.