Question

.Please form info discussion groups of 3 (no more than 3) to solve the following questions. Use the boards in the classroom to discuss the details of your solutions and show of work. Markers and erasers will be provided. Please return them after end of the class. Groups will be called to solve the questions for the rest of the class (bonus points opportunity) The final answers to each question is provided in the parenthesis. You need to arrive at the same answer within your group. Try to find the right solution to get at the right answer. Please turn in the next page with the solution to the question. Write the name of your group members on the next page. . The question on the next page counts as the assignment of the recitation. Solution to all the questions will be posted on Canvas. Q1) In the first stage of a two-stage rocket, the rocket is fired from the launch pad starting from rest but with a constant acceleration of 3.50 m/s2 upward. At 25.0s after launch, the second stage fires for 10.0 s, which boosts the rocket's velocity to 132.5 m/s upward at 35.0 s after launch. This firing uses up all the fuel, however, so after the second stage has finished firing, the only force acting on the rocket is gravity. Air resistance can be neglected Find the maximum height that the stage-two rocket reaches above the launch pad. (3090) b) How much time after the stage-two firing will it take for the rocket to fall back to the launch pad? (38.6) c) a) How fast will the stage-two rocket be moving just as it reaches the launch pad?(246) Q2) A physics teacher performing an outdoor demonstration suddenly falls from rest off a high cliff and simultaneously shouts "Help". When she has fallen for 3.0s, she hears the echo of her shout from the valley floor below. The speed of sound is 340 m/s. a) How tall is the cliff? (530) b) If air resistance is neglected, how fast will she be moving just before she hits the ground? (Her actual speed will be less than this, due to air resistance.) (100) Q3) A test rocket starting from rest at point A is launched by accelerating it along a 200.0-m incline at 1.30 m/s2. The incline rises at 35.0o above the horizontal, and at the instant the rocket leaves it, its engines turn off and the rocket is subject to gravity only (ignore air resistance). Find the maximum height above the ground that the rocket reaches. (123) Q4) The earth has a radius of 6380 km and turns around once on its axis in 24 h. If arad at the equator is greater than g, objects would fly off the earth's surface and into space. What would the period of the earth's rotation have to be for this to occur? (5070) Q5) An airplane pilot wishes to fly due west. A wind of 88.0 km/h is blowing toward the south. a) b) If the airspeed of the plane is 410.0 km/h, in which direction should the pilot head? (12.4) What is the speed of the plane over the ground? (400)

Answer 1

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