Help me please

General Physics 1

PROBLEM Solving 1. A 480 1b motorcycle accelerates from 0 to 55mi/h in 6s. (a) What is the magnitude of the motorcycle's constant acceleration? (b) What is the magnitude of the net force causing the acceleration? 2. A weight-conscious STEM student with a mass of 48kg rests on a bathroom scale. What are (a) the student's weight and (b) the 11 normal force on the student? What is the reading on the scale, assuming it is calibrated in weight units? 3. Figure below shows four blocks being pulled across a frictionless floor by force F. What total mass is accelerated to the right by (a) force F, (b) cord 3, and (c) cord 1? (d) Rank the blocks according to their accelerations, greatest first. (e) Rank cords according to their tension, greatest first. Cord Cord Cord 15 kg 5 kg 9 kg 3 kg 4. Figure A shows a crude mobile hanging from a ceiling, with two metal pieces strung by cords of negligible mass the mass of the pieces are given. What is the tension in (a) bottom cord and (b) top cord? Figure B shows a similar mobile consisting of three metal pieces. The masses of the highest and lowest pieces are given. The tension in the top of the cord is 199N. What is the tension in (c) lowest cord and (d) the middle cord? 3 kg 5.5 kg Figure A 5 kg Figure B 7.5 kgDirections: A. Draw the free-body diagrams of the forces acting on each item. B. Identify the forces acting on the object in each item. C. Identify whether the net force is a balance or not balance. 1. A rightward force is applied to a book to move it across a desk at a constant velocity. Consider frictional forces. Neglect air resistance. 2. A gymnast is holding onto two ropes attached to the ceiling. 3. An egg is free-falling from a nest in a tree. Neglect air resistance. 6 4. A grade 12 student rests a backpack upon his shoulder. The pack is suspended motionless by two straps from his shoulder. 5. A block is sliding in a 30 inclined plane as shown in the figure.Activity 1: Take Care of the Egg! Materials: Egg (1-peso coin if there's no egg available), glass half-filled with water, cardboard Procedures: 1. Position the egg on top of the cardboard while the cardboard is on top of the glass of water (as shown in the picture). Take a picture of your set-up then attach it to your answers. 2. Quickly pull the cardboard this time. Observe what will happen to the egg. Guide Questions: 1. Describe the egg's position and motion before pulling the cardboard. 2. What happened to the egg when you quickly pull the cardboard? 3. Did you apply force to the egg as you quickly pull the cardboard? 4. Why did the egg behave that way? Closure: Explain the law of inertia