PhysicsTutorQuestionsNovember17th

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LON CAPA: Fluids o4 (2a) Calculate the absolute pressure at an ocean depth of 676 m. Assume the density of seawater is 1024 kg/m3. 6.89x106 Pa You are correct. Your receipt no. is 157-8851 @) (2b) At this depth, what force must the frame around a circular submarine porthole having a diameter of 76.2 cm exert to counter balance the force exerted by the water? |7.701E5 N | Submit Answer | Incorrect. Tries 2/10 Previous Tries Previous Tries Couldn't figure out b bl (3) A 53.1 cm diameter circular cover is placed over a 7.05 cm diameter hole that leads into an evacuated chamber. The pressure in the chamber is 38.9 kPa. How much force is required to pull the cover off? 60.92 N Submit Answer Incorrect. Tries 1/10 Previous Tries P bl ~ Afbha bk Wiabar in than A hath aemme TE bha o4 (7) A person who weighs 660 N is riding a 109 N mountain bike. Suppose the entire weight of the rider and bike is supported equally by the two tires. If the gauge pressure in each tire is 7.12E+5 Pa, what is the area of contact between each tire and the ground? |3703.5 m*2 | rsﬂbmit Answer ] Incorrect. Tries 2/10 Previous Tries o8 (8) Glycerin, of density 1260.0 kg/ma, is poured into an open U-shaped tube. Ethyl alcohol, of density 790.0 kg/m?3, is then poured into one arm until the height of the alcohol column is 51.7 cm. The two liquids do not mix. What is the difference in height between the top surface of the glycerin and the top surface of the alcohol? [-30.75 cm ‘ Submit Answer | Incorrect. Tries 4/10 Previous Tries L - (.11:) A cube of wood having a side dimension of 19.02 cm and a density of 502 kg/m3 floats on water. What is the distance from the top surface of the cube to the water level? - [ 'Submit Answer | Incorrect. Tries 2/10 Previous Tries (11b) What mass of lead must be placed on top of the cube so that the top of the cube is just level with the water surface?\ [ Submit Answer ‘ Tries 0/10 A (12) The spring of a pressure gauge has a force constant of 731 N/m, and the piston attached has a diameter of 1.94 cm. When the gauge is lowered into water, at what depth does the piston move in by 0.428 cm from its position at the surface? | Submit Answer | Tries 0/10 Vacuum e (13) 2.088 kg of glass (p = 2.60E+3 kg/m3) is shaped into a hollow spherical shell that just barely floats in water. What are the inner and outer radii of the shell? Do not assume that the shell is thin. Input the inner radius first. | Submit Answer | Tries 0/10 | submit Answer | Tries 0/10 Submit All

Incorrect Midterm 2 Questions Question 2 Four ice cubes, each of mass m, are sliding on a frictionless surface as shown below. Blocks A, C, and D all have the same speed, block B is initially stationary. vV v v A C After a series of elastic collisions what are the final velocities of the ice cubes? Take to the right as the positive direction. VA=-V,VB=O,VC=0,VD=+2V = va =-V,vg =0,vc = +v,vp = +v VA =-V,vg=-V,vc =0, vp = +v VA = -V, VB = -V, Vc = tV,vp = +V % (@ VA=0,vg=+V,vc=-v,vp = +v Question 4 Rank the forces below in order from largest to smallest based on the magnitude of work done for the displacement vector shown. Note that all three displacement vectors are equal and the magnitude of all three force vectors are equal. = F1>F3>F3 F1=F2=F3 F3>F1>F2 % o F1>F2>F3 F1 = F3 > F2 Question 14 Three objects are in a perfectly inelastic collision at the origin. The variables m and vin the picture are given by: m=1.18 kg v=1.52m/s A . . . . . . 2m . : v . . o . v .o 45 > m . . » X . v H m What is the final speed of the combined object after the collision? NOTE: Please enter your answer with three significant figures. Do not use scientific notation. Do not enter units (but your answer must be in m/s). Answer: 1.05 % (0.2226)

Question 15 Physics Girl and Phi Fox are trying to learn a bit more about physics. They decide to drop some objects to see if they bounce. At the same time, Physics Girl drops an orange and Phi Fox drops a tennis ball, each of mass m, from a height of 1 m above the ground. The orange hits the ground with a speed v and stops. The tennis ball also hits the ground with a speed v and then bounces up with a speed v/2. Which of the following statements about the impulse that the ground receives from the orange and the tennis ball is true? % ‘o Theimpulse the ground received from the tennis ball is equal to the impulse the ground received from the orange. The impulse the ground received from the tennis ball is 2 times impulse the ground received from the orange. The impulse the ground received from the tennis ball is 0.5 times the impulse the ground received from the orange. = The impulse the ground received from the tennis ball is 1.5 times the impulse the ground received from the orange. The impulse the ground received from the tennis ball is 0.75 times the impulse the ground received from the orange. Question 18 A Snow Goose is flying horizontally over the McMaster campus in the positive x-direction and experiences a force from the wind as shown in the graph below. If the Goose initially has 4.63 J of kinetic energy, what is the Goose's kinetic energy when it reaches x = 7 m? Frmax = 6.0N Fmin = -3.0N Fx Fmax oL/ 2 | !l 6 > (m) NOTE: Please enter your answer with three significant figures. Do not use scientific notation. Do not enter units (but your answer must be in Joules). Answer: 36.1 x (21.13)

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