Questions asked by Jafreen

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• What does v=dx/dt means?
  
• A projectile's launch speed is five times its speed at maximum height.Find launch angle.How do I find this?
  
• A plane.diving with a constant speed at an angle of 53.0 with the vertical,releases a projectile at an altitude of 730m.The projectile hits the ground 5.00s after release.(A) WHat is the speed of the plane?
  
• The x component of vector A is -25.0m and the y component +40.0m a) What is the magnitude of A? b) What is the angle between direction of A and pos+ direction of x?
  
• A car is driving east for a distance of 50km, then north for 30km and then in a direction 30 east of north for 25km. Determine the angle of the car's total displacement from its starting point?
  
• How to calculate #(dv_x)/(dt)# to find #x# component using #x(t) = -0.62t + 7.2#?
  
• A projectile is fired horizontally from a gun that is 45.0m above flat ground,emerging from the gun with a speed of 250m/s (a) How long does the projectie remains in the air? (
  
• A projectile motion is fired horizontally from a gun that is 45.0m above the flat ground,emerging from the gun with a speed of 250m/s.What is the magnitude of the vertical component of its velocity as it strikes the ground?
  
• The current world-record motorcycle jump is 77.0m,set by Jason Renie.Assume that he left the take-off ramp at 12.0° to the horizontal and that the takeoff and landing heights are the same.Neglecting air drag, how do I find his takeoff speed?
  
• At time t=0, constant F begins to act on a rock moving through deep space in the +x direction. For time t>0, which are possible function x(t) for the rock's position : (1)x=4t-3 (2) x=-4t^2+6t-3 (3) x=4t^2+6t-3?
  
• The probability that a contractor will get a plumbing contract is 2/3 and the probability that he will get an electric contract is 5/9. If the probability of getting at least one contract is 4/5, what is the probability that he will get both?
  
• A dart is thrown horizontally with an initial speed of 10m/s toward point P,the bull's eye on a dart board.It hits at point Q on the rim,vertically below P,0.19s later. What is the distance PQ? How far away from the dart board is the dart released?
  
• A plane diving with constant speed at an angle of 53.0 with the vertical,release a projectile at an altitude of 730m. The projectile hits the ground hits the ground 5.00s after release.How far does the projectile travel horizontally during its flight?
  
• Only two horizontal forces act on a 3.0kg body that can move over a frictionless floor.One force is 9.0N,acting due to east and the other is 8.0, acting 62 degree of west. What is the magnitude of the body's acceleration?
  
• Tarzan who weighs 688N,swings from a cliff at the end of a vine 18m long . From the top of the cliff to the bottom of the swing, he descends by 3.2m and should not exceed 950N. If the vine breaks,what is the greatest force on it during the swing?
  
• If IA+BI = IA-BI, find the angle between the vector A and B and show that the two vectos are perpendicular to each other. How to answer this question?
  
• The velocity of a sailing boat in favor of the current in a river is 18km/hr and against the current, it is 6km/hr.In which direction the boat is to be driven in order to reach the other side of the river and what will be the velocity of the boat?