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La física es una materia muy importante entre todas las disciplinas naturales, utilizada para explicar las maravillas de la vida, y también es una de las materias más difíciles de estudiar.
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- POSSIBLE POINTS: 6.2 A ball of mass 0.5 kg, initially at rest, acquires a speed of 4m/s immediately after being kicked by a force of strength 20 N. For how lor did this force act on the ball? 0.1 s 0.01 s 0.2 s 1s D 0.02 s
- What is the magnitude of the impulse of a wall on a 0.5 kg ball that strikes horizontally at 25m/s and rebounds horizontally at 25 mis? POSSIBLE POINTS: 0.25 100kgcdot m/s 25kgcdot m/s 50kgcdot m/s 80kgcdot m/s 12.5kgcdot m/s
- The diagram shows a compressed spring between two carts initially at rest on a horizontal frictionless surface. Cart A has a mass of 2 kg and cart B has a mass of 1 kg. A string holds the carts together. After the string is cut and the two carts move apart, the magnitude of which quantity is the same for both carts? Velocity Kinetic energy Momentum Inertia Acceleration
- Identical net forces act for the same length of time on two different spherical masses. Which of the following de linear momentum of the smaller mass compared to that of the larger mass? It is smaller than the change in linear momentum of the larger mass but not zero. It is equal to the change in linear momentum of the larger mass. It depends on the relative diameters of the two masses. It is zero. It is larger than the change in linear momentum of the larger mass.
- A car travels down a highway at 35m/s An observer stands 200 m from the highway. (a) How fast is the distance from the observer to the car increasing when the car passes in front of the observer? (Use decimal notation.Give your answer to three decimal places.) (d)/(dx)approx square cos Enter numeric value (b) How fast is the distance increasing 50 s later? (Use decimal notation. Give your answer to three decimal places.) (d^4)/(dt)approx square