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- • The system in the figure is at equilibrium and m 13kg. What is the tension in cord 1(T¡) assuming the angle 0 = 53° (in N)? %3D T T b. 130 C 162.5 d 2167Ex, 13 : A soap bubble has diameter 2 cm. Calculate the work done to increase its diameter to 6 cm. surface tension of is 35 soap dynes/cm.•40 The potential energy of a diatomic molecule (a two-atom system like H2 or O2) is given by B r12 where r is the separation of the two atoms of the molecule and A and B are positive constants. This potential energy is associated with the force that binds the two atoms together. (a) Find the equilib- rium separation-that is, the distance between the atoms at which the force on each atom is zero. Is the force repulsive (the atoms are pushed apart) or attractive (they are pulled together) if their separa- tion is (b) smaller and (c) larger than the equilibrium separation?
- 10N force is uniformly distributed over the surface of a sphere of radius 20cm. The force at each point acts inward along the normal at that point. Find the fractional change in volume if the compressibility of the sphere is 10-11m2/N. a) 3*10-10 b) 1.5*10-11 c) 1.98*10-10 d) 2*10-11You have a rubber pad with a handle attached top it. If you press the pad firmly on a smooth table , it is impossible to lift off table. Why? What force would you need to exert on the handle to lift it? The surfacew area of pad is .023 m^2. What you need: 1. list knowns and unknowns 2. force diagram 3. math model and equations 4. answer with all work and units shown 5. evaluate your answer7/53 A uniform rectangular block of height h and mass m is centered in a horizontal position on the fixed circular surface of radius r. Determine the limiting value of h for stability. •G PROBLEM 7/53 h
- Steel ball with radius of 0.13 m lays on a bottom of the lake 6 m deep. What work is needed to lift the ball to the surface of the lake? Density of steel is 7860kg/m3. The volume of a sphere is Use g = 9.8 m/s2 Calculate answer to two decimals.QS/ A/ Answer the following questions: 1) Define the hydrostatic equation and what are its uses? 2) Explain how the forces of cohesion and adhesion of a fluid can be recognized in a capillary tube. 3) A tennis ball was thrown upward into the air from a height of 1.34 m. When it reached the maximum height, it fell down to the ground at a speed of 5 ms. Describe its energy through the whole journey.Does the International Space Station have gravitational PE? KE? Explain.
- 3. On a very rainy day, Nick drags a box of old books to the bookstore to sell. The box moves through the puddles at U = 10 ft/min. For all calculations use an approximation that the box follows the figure. Calculate the force required to keep the box moving at U. Hints: obtain drag coefficient by calculating the Reynolds number; consider the projected area as the bottom plus the two long sides. • Determine the power (in watt) required to overcome the skin friction drag B = 2 ft L=3 ft -Water line D = 2 ina ship is loaded, while load it displaces a Volume of 220, 0oom³ and sits at a draft of 8m. when it is unloaded by 122800 tonnes by the height X Calculate a. the mass of the loaded Ship 6. X = the new draft •1 tion Calculate the resultant force ANGLE relative to progression uring the initial contact phase of gait (to 1 decimal place) given the following data vertical force Z=953 N and horizontal force X = -426 N Answer: Check pe here to search E R V 18 T E H N U J M Ps 4 0°C Haze Next page 07:32 30/11/2023 ^ x 0