PREVIOUS ANSWERS OSCOLPHYSZO16 4.3.WA.019. ASK YOUR TEACHER PRACTICE ANOTHER Alexis asked to move two boxes of books in contact with each other and resting on a frictionless floor. He decides to move them at the same time by pushing on box A with a horizontal pushing force FD = 8.0 N. 11. [08 Points] Here box A has a mass mA = 14.7 kg and box B has a mass m5 = 7.0 kg. The contact force between the two boxes is FE and N denotes the normal force. (a) What is the acceleration [in m/SZ) of the two boxes? 0 4323 )1 Did you draw 3 free body diagrams, one for each box and one for the two boxes combined and identify the forces acting on each system? Fry's.2 (b) What is the force (in N) exerted on mg by mA? E N (c) If Alex were to push from the other side on the 7.0 kg box, how would your answer to part (b) change? :N 6. [-/4 Points] DETAILS OSCOLPHYS2016 4.3.P.012. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER The rocket sled shown in the figure below decelerates at a rate of 219 m/s". Its passenger has a mass of 71.0 kg. The forces are exerted by the seat and restraining belts. (a) Calculate the horizontal component of the force (in N) the seat and restraining belts exerts against his body. (Assume the +x-direction is to the right. Indicate the direction with the sign of your answer. Enter your answers to at least four significant figures.) Compare this with his weight by using a ratio. IFI Iwl Calculate the direction and magnitude of the total force the seat and restraining belts exerts against his body. (Enter the direction to at least three significant figures in degrees counterclockwise from the +x-axis and the force to at least four significant figures in N.) direction counterclockwise from the +x-axis magnitude N3. [-/1 Points] DETAILS OSCOLPHYS2016 4.3.P.002. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER An 85.0 kg sprinter starts a race with an acceleration of 1.36 m/s. If the sprinter accelerates at that rate for 28 m, and then maintains that velocity for the remainder of the 100 m dash, what will be his time (in s) for the race?10. [0/2 Points] DETAILS PREVIOUS ANSWERS OSCOLPHYS2016 4.3.WA.015. TUTORIAL. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER A flea jumps by exerting a force of 1.22 x 10" N straight down on the ground. A breeze blowing on the flea parallel to the ground exerts a force of 1.14 x 10" N on the flea. Find the direction and magnitude (in m/s2) of the acceleration of the flea if its mass is 6.0 x 10" kg. (Let us assume that F points to the right. We will consider this to be the +x direction and vertical to be the +y direction.) magnitude 24.294 X Did you draw a free-body diagram, and identify the forces acting on the flea? Consider the forces acting on the flea during the time it is in contact with the ground. m/s direction 23.79 X Review vector components. In which of the four quadrants is the resultant force located? (measured clockwise from the vertical)9. [0/1 Points] DETAILS PREVIOUS ANSWERS OSCOLPHYS2016 4.3.WA.011. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER The engine of a locomotive exerts a constant force of 8.2 x 10 N to accelerate a train to 78 km/h. Determine the time (in min) taken for the train of mass 1.7 x 10' kg to reach this speed from rest. 78 X Which kinematic equation do you need to use to find the time? min