Written Homework problems. Spring (taken from Giancoli, 4 th edition)
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1 Written Homework problems. Spring 014. (taken from Giancoli, 4 th edition) HW1. Ch1. 19, Determine the conversion factor between (a) km / h and mi / h, (b) m / s and ft / s, and (c) km / h and m / s. 47. n average family of four uses roughly 100 L (about 300 gallons) of water per day 3 1 L 1000 cm. How much depth would a lake lose per year if it uniformly covered an area of 50 km and supplied a local town with a population of 40,000 people? Consider only population uses, and neglect evaporation and so on. HW. Ch. 9, The position of a rabbit along a straight tunnel as a function of time is plotted in Fig. 36. What is its instantaneous velocity (a) at t 10.0 s and (b) at t 30.0 s? What is its average velocity (c) between t 0 and t 5.0 s, (d) between t 5.0 s and t 30.0 s, and (e) between t 40.0 s and t 50.0 s? 51. baseball is hit almost straight up into the air with a speed of about 0 m / s. (a) How high does it go? (b) How long is it in the air? HW3. Ch3. 9, (a) Determine the magnitude and direction of the sum of the three vectors ˆ ˆ ˆ ˆ V1 40. i80. j, V ij, and V ˆ ˆ 3 0. i40. j. (b) Determine V V V hunter aims directly at a target (on the same level) 68.0 m away. (a) If the bullet leaves the gun at a speed of 175 m s, by how much will it miss the target? (b) t what angle should the gun be aimed so the target will be hit?
2 HW4. Ch4. 33, One 3.-kg paint bucket is hanging by a massless cord from another 3.-kg paint bucket, also hanging by a massless cord, as shown in Fig (a) If the buckets are at rest, what is the tension in each cord? (b) If the two buckets are pulled upward with an acceleration of 1.5 m/s by the upper cord, calculate the tension in each cord. 51. Figure shows a block (mass m ) on a smooth horizontal surface, connected by a thin cord that passes over a pulley to a second block m B, which hangs vertically. (a) Draw a free-body diagram for each block, showing the force of gravity on each, the force (tension) exerted by the cord, and any normal force. (b) pply Newton s second law to find formulas for the acceleration of the system and for the tension in the cord. Ignore friction and the masses of the pulley and cord. HW5. Ch5. 10, wet bar of soap slides freely down a ramp 9.0 m long inclined at 8.0. How long does it take to reach the bottom? ssume µ k = (a) Suppose the coefficient of kinetic friction between m and the plane in Fig is µ k =0.15 and that m m B.7 kg. s m B moves down, determine the magnitude of the acceleration of m and m, B given θ=34. (b) What smallest value of k m will keep the system from accelerating? HW6. Ch6. 11, (II) Four masses are arranged as shown in Fig Determine the x and y components of the gravitational force on the mass at the origin (m). Write the force in vector notation ˆ i, ˆ j.
3 8. (II) Two satellites orbit Earth at altitudes of 5000 km and 15,000 km. Which satellite is faster, and by what factor? HW7. Ch7. 15, grocery cart with mass of 16 kg is being pushed at constant speed up a flat 1 ramp by a force F P which acts at an angle of 17 below the horizontal. Find the work done by each of the forces mg, F N, F P on the cart if the ramp is 15 m long. 75. Two forces, F1. ˆi. ˆj. kˆ N and ˆi. ˆj N, are applied on a moving object of mass 0.0 kg. The displacement vector produced by the two forces is d 80. ˆi60. ˆj50. kˆ m. What is the work done by the two forces? HW8. Ch8. 36, Consider the track shown in Fig The section B is one quadrant of a circle of radius.0 m and is frictionless. B to C is a horizontal span 3.0 m long with a coefficient of kinetic friction m k 05.. The section CD under the spring is frictionless. block of mass 1.0 kg is released from rest at. fter sliding on the track, it compresses the spring by 0.0 m. Determine: (a) the velocity of the block at point B; (b) the thermal energy produced as the block slides from B to C; (c) the velocity of the block at point C; (d) the stiffness constant k for the spring kg skier starts from rest at the top of a ski jump, point in Fig. 8 41, and travels down the ramp. If friction and air resistance can be neglected, (a) determine her speed y B when she reaches the horizontal end of the ramp at B. (b) Determine the distance s to where she strikes the ground at C.
4 HW9. Ch9. 17, rocket of mass m traveling with speed y 0 along the x axis suddenly shoots out fuel equal to one-third its mass, perpendicular to the x axis (along the y axis) with speed y 0 * Express the final velocity of the rocket in ˆˆ i, j, k ˆ notation g baseball moving 8. 0 m/s strikes a stationary 5.5-kg brick resting on small rollers so it moves without significant friction. fter hitting the brick, the baseball bounces straight back, and the brick moves forward at m/s. (a) What is the baseball s speed after the collision? (b) Find the total kinetic energy before and after the collision. HW10. Ch9.#56; Ch10.# (Ch9) Two billiard balls of equal mass move at right angles and meet at the origin of an xy coordinate system. Initially ball is moving upward along the y axis at. 0 m/s, and ball B is moving to the right along the x axis with speed 37m/s.. fter the collision (assumed elastic), the second ball is moving along the positive y axis (Fig. 9 43). What is the final direction of ball, and what are the speeds of the two balls? 30. (Ch10) Determine the net torque on the.0-m-long uniform beam shown in Fig Calculate about (a) point C, the CM, and (b) point P at one end.
5 HW11. Ch10.#46; Ch11.# (Ch10) Two blocks are connected by a light string passing over a pulley of radius 0.15 m and moment of inertia I. The blocks move (towards the right) with an acceleration of 1.00 m/s along their frictionless inclines (see Fig ). (a) Draw free-body diagrams for each of the two blocks and the pulley. (b) Determine F T and F, TB the tensions in the two parts of the string. (c) Find the net torque acting on the pulley, and determine its moment of inertia, I. 10. (Ch11) uniform disk turns at 3.7 rev/s around a frictionless spindle. nonrotating rod, of the same mass as the disk and length equal to the disk s diameter, is dropped onto the freely spinning disk, Fig They then turn together around the spindle with their centers superposed. What is the angular frequency in rev/s of the combination? HW1. Ch11.#41; Ch1.#4 41. (Ch11) Figure shows two masses connected by a cord passing over a pulley of radius R 0 and moment of inertia I. Mass M slides on a frictionless surface, and M B hangs freely. Determine a formula for (a) the angular momentum of the system about the pulley axis, as a function of the speed y of mass M or M, B and (b) the acceleration of the masses. 4. (Ch1) large 6.0-kg board is propped at a 45 angle against the edge of a barn door that is.6 m wide. How great a horizontal force must a person behind the door exert (at the edge) in order to open it? ssume that there is negligible friction between the door and the board but that the board is firmly set against the ground.
Q16.: A 5.0 kg block is lowered with a downward acceleration of 2.8 m/s 2 by means of a rope. The force of the block on the rope is:(35 N, down)
Old Exam Question Ch. 5 T072 Q13.Two blocks of mass m 1 = 24.0 kg and m 2, respectively, are connected by a light string that passes over a massless pulley as shown in Fig. 2. If the tension in the string
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