QUESTION 23 15 points Save Answer there is no rotation. A green car with mass 900 kg is travelling east at 40 m/s. Simultaneously, a yellow car with mass 1600 kg is travelling north at 30 m/s. They collide in a perfectly inelastic collision, such that a) During the collision, which car experiences the greater force? Why? b) What is the momentum of each car before the collision? c) What is the magnitude of the momentum of the two combined cars after the collision? d) What is the speed (magnitude) of the two cars after the collision? e) What is the direction of the motion of the cars after the collision? Please write your answers in the space below and email your work. For the toolbar, press ALT+F10 (PC) or ALT+FN+F10 (Mac). BIUS Paragraph Arial 10pt V A V Ix . .. E E X2 X2 SIT The V X EX:QUESTION 12 Water flows from a pipe with cross-sectional area 3 m^2 into a pipe with cross-sectional area 2 m^2. The water flows at 2 m/s in the smaller pipe, and kg/m^3. the pipes are both at the same height. The pressure in the smaller pipe is 200 Pa. What is the pressure in the larger pipe? The density of water is 1000 O a. 0 Pa O b. 1880 Pa O c. 1311 Pa O d. 2036 Pa QUESTION 13 Aluminum has a density of 2700 kg/m^3. You are given a sample of pure aluminum and determine that it has a mass of 550 kg. What is the volume of the sample? O a. 6.0 m^3 O b. 0.21 m^3 O c. 0.17 m13 O d. 4.9 m^3QUESTION 21 15 points Save Answer A pipe with cross-sectional area 0.5 m^2 runs horizontally across a platform 8 m off the ground. It is joined via a vertical section of pipe to another horizontal pipe on the ground, this one 0.25 m^2 in area. The speed of the water in the upper pipe is 3 m/s. The density of water is 1000 kg/m^3. a) What is the speed of the fluid in the lower pipe? b) What is the pressure in the lower pipe if the pressure in the upper pipe is 500 Pa? For the toolbar, press ALT+F10 (PC) or ALT+FN+F10 (Mac). BIUS Paragraph Arial 10pt A V V TX E ... E X2 X2 + V X H+ EX O - (?) KyA hollow spherical shell of mass 3 kg and radius 20 cm spins about a central axis at 10 rad/s. How much torque would be required to stop it from spinning in 3 seconds? Hint: See table of moments of inertia. a. 0.08 N m O b.0.26 N m O c. 0. 12 N m O d. 0.06 N m QUESTION 6 A spring has a 10 kg mass attached to one end, which stretches it 1.1 m. What is the spring constant of the spring? O a. 250 N/m O b. 91 N/m O c. 135 N/m O d. 108 N/mQUESTION 24 A hollow spherical shell of radius 30 cm rolls down a ramp without slipping. a) If it started at rest 10 m above the lowest point, what will its linear speed be at the bottom of the hill? b) What angular speed will it have at the bottom of the hill? Please write your answers in the space below then email your work. For the toolbar, press ALT+F10 (PC) or ALT+FN+F10 (Mac). BIUS Paragraph Arial V 10pt V A V V E E X2 X2 + ABC V V XQUESTION 7 The spring from the previous problem has the mass removed and replaced with a 30 kg mass. How far does the spring stretch? O a. 1.1 m O b.3.3 m O c. Om O d. 4.4 m QUESTION 8 Jim swims 6 feet below the surface of a 20-m-wide swimming pool filled with fresh water. Sally swims 4 feet below the surface of a 1000-m-wide fresh water lake. Which will experience the greater pressure from the water? O a. Jim O b. Sally O c. They will both experience the same pressure O d. It is impossible to answer this question without knowing the total depth of the pool and lake QUESTION 9 What is the pressure 10 m beneath the surface of a pool filled with water (density 1000 kg/m^3)? O a. 100 kPa O b. 10 kPa O c. 120 kPa O d. 12 kPaQUESTION 1 Two cars, each with mass of 900 kg, collide at right angles, sticking together. If they were both traveling at 10 km/h, approximately how fast are they moving after the collision? O a. 6.4 km/hr O b. 14.1 km/hr O c. 7.1 km/hr O d. 7.8 km/hr QUESTION 2 A rubber ball with mass 1 kg is bounced off the floor, taking 0.1 s to bounce. If it has a speed of 12 m/s just before impact, and bounces back with a speed of 7 m/s in the opposite direction, how much force does the floor exert on the ball? O a. 190 N O b. 110 N O c. 50 N O d. 150 NQUESTION 10 What is the buoyant force on a beach ball with volume 0.05 m^3 submerged 6 m beneath a pool of water (density 1000 kg/m^3)? O a. 50,000 N O b. 60,000 N O c. 40,000 N O d. 500 N QUESTION 11 Water flows from a pipe with cross-sectional area 2 m^2 into a pipe with cross-sectional area 1 m^2. If the water flows at 5 m/s in the smaller pipe, how fast will it flow in the larger pipe? O a. 0.8 m/s O b. 2.5 m/s O c. 0.4 m/s O d. 1.25 m/sQUESTION 14 A boat is designed to hold a maximum load of 10,000 kg - including the mass of the boat - on fresh water (density 1000 kg/m^3). What volume of water will be displaced if the boat is fully loaded? O a. 10 m^3 O b. 0.1 m^3 O c. 0.125 m^3 O d. 8 m^3 QUESTION 15 Copper has a linear coefficient of thermal expansion of 16.5x10^-6 K^-1 and a volume coefficient of thermal expansion of 49.9x10^-6 K^-1. A copper cube has sides of length 5 cm at 250 K. What will its volume be if it is heated to 1000 K? Round to the nearest cm^3. O a. 130 cm^3 O b. 5 cm^3 O c. 125 cm^3 O d. 6 cm^3QUESTION 20 Tina has a mass of 30 kg and sits on a see-saw, 2.4 m from the axis of rotation. Jack has a mass of 25 kg and wishes to sit on the other end of the see-saw. a) Where should he sit if he wishes the net torque on the see-saw to be zero? b) Jack's dog spot jumps on his end of the see-saw. Spot has a mass of 10 kg and sits on a point 3 m from the axis of rotation. What is the net torque on the see saw? c) If the see-saw has an angular acceleration of 1 rad/s^2 after the dog jumps on, what is the moment of inertia of the see-saw system (including the kids and dog)? Please write your answers in the space below, then email your work. For the toolbar, press ALT+F10 (PC) or ALT+FN+F10 (Mac). BIUS Paragraph Arial 10pt A Ix E E x2 X2 - + ABC X EXEQUESTION 26 15 points Save Answer A 60 kg block of ice begins at -60 degrees C. The specific heat of ice is 2090 J/(kg C) and the specific heat of water is 4186 J/(kg C). The latent heat of fusion of water is 3.3x1015 J/kg and the latent heat of vaporization is 2.3x10^6 J/kg. a) How much energy is required to heat the ice to the melting point (0 degrees C)? b) How much energy is required to heat the ice from -50 degrees C to the melting point and melt the ice? c) How much energy is required to heat the ice from -50 degrees C to the melting point, melt the ice and raise the temperature of the water to 100 degrees C? d) How much energy is required to heat the ice from -50 degrees C to the melting point, melt the ice and raise the temperature of the water to 100 degrees C, then evaporate the water? Please write your answers in the space below and email your work. For the toolbar, press ALT+F10 (PC) or ALT+FN+F10 (Mac). B I U S Paragraph Arial 10pt E A TX E E X2 X2 ST The - + ABC X EX: (;} ?QUESTION 22 10 moles of an ideal gas are initially at a pressure of 5000 Pa within a volume of 1 m^3. Remember that k=1.38x10^-23 J/K and R=8.315 J/(mol K). a) What is the temperature of this gas? b) The gas is now compressed isothermally (at a constant temperature) to 0.2 m^3. What is the new pressure of the gas? c) What is the average kinetic energy per particle in the gas? Please write your answers in the space below and email your work. For the toolbar, press ALT+F10 (PC) or ALT+FN+F10 (Mac). BIUS Paragraph Arial 10pt A V TX E E X2 X2 STT The - + ABC V X EX:QUESTION 18 Sam and Sue both throw identical eggs with the same speed. Sam's egg hits a loosely held sheet, and comes to rest without injury. Sue's egg hits a brick wall, and shatters as it comes to rest. Which of the following best explains why this happened? O a. The wall applied a greater impulse to the egg, and thus a greater force than the sheet. O b. The wall applied a greater impulse to the egg, which caused it to break despite the force being the same as the sheet. O c. The wall delivered both the same force and impulse, but the egg hitting the wall had a structural defect. O d. The wall applied the same impulse as the sheet, which led to a greater force being delivered to the egg due to a shorter impact time. QUESTION 19 An ideal gas containing 10^25 particles is originally at a pressure of 1015 Pa in a volume of 0.1 m^2. The gas is then heated isochorically to a temperature of 300 K. How much heat energy is required? Remember that k=1.38x10^-23 J/K and R=8.315 J/(mol K). O a. 31 kJ O b. 3.14x10^-21 J O c. 3.4x10127 J O d. 47 KJQUESTION 3 How much torque is produced by a 50 N perpendicular force at the end of a 3 m long wrench? O a. 50 N m O b. 100 N m O c. 150 N m O d. 200 N m QUESTION 4 A ladybug with mass 0.1 g flies through a window and lands on a record player, which is turning at 3.5 rad/s. If the ladybug is 3 cm from the axis of rotation, what is the ladybug's tangential speed? O a. 10.5 cm/s O b. 7 cm/s O c. 14 cm/s O d.3.5 cm/sQUESTION 16 K ) . 2 moles of an ideal gas are under 1500 Pa of pressure at 250 K. What is the volume of the gas? Remember that k=1.38x10^-23 J/K and R=8.315 J/(mol O a. 5.5x10^-24 m^3 O b. 4.6x10^-24 m^3 O c. 3.3 m^3 O d. 2.8 m^3 QUESTION 17 4 moles of an ideal gas are under 2000 Pa of pressure at 300 K. What is the average kinetic energy per particle in the gas? Remember that k=1.38x10^-23 J/K and R=8.315 J/(mol K). O a. 8.28x10^-21 J O b. 6.21x10^-21 J O c. 15 KJ O d. 20 kJQUESTION 25 15 points Save Answer An old Dutch legend has a small boy plug a leak in a dyke with his finger, saving the town from being flooded by the ocean. Let's examine this story to see if it is possible. Let's say the boy plugs a hole with area 1 cm^2, which is 5 m below sea level. The density of sea water is approximately 1030 kg/m^3, and the Atlantic Ocean contains approximately 3.5x10^17 m^3 of water. a) What would the water pressure be at the point of the hole? b) How much force would the boy have to apply to stop the water from flowing through the hole? c) Considering the 1 N=0.22 lbs, could he do it? Please write your answers in the space below and email your work. For the toolbar, press ALT+F10 (PC) or ALT+FN+F10 (Mac). BIUS Paragraph Arial 10pt V A V TX . . . EE X2 X2 - + ABC V X EXE