stion 2 of 8 <. A delivery person carries a stack of three boxes labeled 1, 2, and 3, with box 3 on the bottom of the stack and box 1 on the top. The masses of boxes 1, 2, and 3 are m1 1.15 kg, m2 2.34 kg, and m3 = 6.80 kg, respectively. The delivery person places the stack of boxes on an elevator floor, which then accelerates upward with a magnitude of a = 0.96 m/s. Let g 9.81 m/s denote the acceleration due to gravity, and let the positive y-direction be upward. Calculate the contact force F2 that box 1 exerts on box 2 during the acceleration. F1 2 Zং I Calculate the contact force F3 2 that box 3 exerts on box 2 during the acceleration. F3 2 - about us careers: privacy policy terms of use help! 12:49 PM 4/5/2020

A 1.0 kg object has a velocity of 5.0f m/s at t = 0. A constant resultant force of (3.0î + 4.0f ) N then acts on the object for 3.0 s. What is the magnitude of object's velocity at the end of the 3.0 s interval? A B D E 9.8m/s 17.7m/s 9.2 m/s 15.0 m/s 16.3 m/s Lütfen birini seçin: O A O B O C O D O E

Suppose you are navigating a spacecraft far from other objects. The mass of the spacecraft is 4.0  104 kg (about 40 tons). The rocket engines are shut off, and you're coasting along with a constant velocity of ‹ 0, 30, 0 › km/s. As you pass the location ‹ 6, 9, 0 › km you briefly fire side thruster rockets, so that your spacecraft experiences a net force of ‹ 5.0  105, 0, 0 › N for 20 s. The ejected gases have a mass that is small compared to the mass of the spacecraft. You then continue coasting with the rocket engines turned off. Where are you an hour later? (Think about what approximations or simplifying assumptions you made in your analysis. Also think about the choice of system: what are the surroundings that exert external forces on your system?)f =         m

As a science fair project, you want to launch an 700 g model rocket straight up and hit a horizontally moving target as it passes 26.0 m above the launch point. The rocket engine provides a constant thrust of 17.6 N. The target is approaching at a speed of 17.0 m/s. # 3 E D 80 F3 C 4 R F 888 V % 5 F5 T G ^ 6 B ▼ Part A At what horizontal distance between the target and the rocket should you launch? Express your answer with the appropriate units. FO Provide Feedback Y Value Submit MacBook Air H HA & 7 N F7 Request Answer U ** → 8 Units DII FB 1 M wwww. ? ( 9 K DD O :) O F10 P F11 1