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  1. M

    Air Bubbles and Gases - Please Help?

    Homework Statement A scuba diver releases a 2.50-cm-diameter (spherical) bubble of air from a depth of 11 m in a lake. Assume the temperature is constant at 16.0ºC, and the air behaves as a perfect gas. How large is the bubble when it reaches the surface? Homework Equations V2 = V1*(T2...
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    Spring Constant and Oscillations - Please Help

    Homework Statement A 1.450 kg air-track glider is attached to each end of the track by two coil springs. It takes a horizontal force of 0.700 N to displace the glider to a new equilibrium position, x= 0.290 m. a.) Find the effective spring constant of the system. b.) The glider is...
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    Simple Pendulum - Maximum Speed

    1. Homework Statement : A simple pendulum has a mass of 0.25 kg and a length of 1.0 m. It is displaced through an angle of 5.0° and then released. 1. What is the maximum speed? 2. What is the maximum angular acceleration? Answer: 0.855 rad/s2 3. What is the maximum restoring force? Answer...
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    Tomato, Salt Water & Olive Oil - Buoyancy

    Homework Statement 1. You put a tomato into a vessel of salty water - it floats. Now you pour olive oil into the same vessel. Which one of the following statements is true? a. More of the tomato will be above the surface of the water. b. The tomato will stay at the same height. c. Less of...
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    Height of Blood Transfusion - Please Help?

    Homework Statement A patient is to be given a blood transfusion. The blood is to flow through a tube from a raised bottle to a needle inserted in the vein. The inside diameter of the 4.07 cm long needle is 0.388 mm and the required flow rate is 3.90 cm3 of blood per minute. How high should the...
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    Speed of Water Out Nozzle. Please Help?

    1. Homework Statement : Water flows through a fire hose of diameter 7.15 cm at a rate of 0.019 m3/s. The fire hose ends in a nozzle of inner diameter 2.17 cm. What is the speed with which the water exits the nozzle? 2. The attempt at a solution: So, I tried using Principle of Continuity: A1...
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    Initial Acceleration of a Center of Mass

    Homework Statement A uniform rod of length 1.25 m is attached to a frictionless pivot at one end. It is released from rest from an angle θ = 23.0° above the horizontal. Find the magnitude of the initial acceleration of the rod's center of mass. I keep getting the wrong answer...
  8. M

    Resulting Angular Speed? Help!

    Homework Statement A flat uniform circular disk (radius = 2.18 m, mass = 1.22E+2 kg) is initially stationary. The disk is free to rotate in the horizontal plane about a frictionless axis perpendicular to the center of the disk. A 42.9 kg person, standing 1.29 m from the axis, begins to run...
  9. M

    Flow Rate Problem -

    Flow Rate Problem - Please Help! 1. Homework Statement : SAE no. 10 oil has a viscosity of 0.2 Pa· s. How long (in sec) would it take to pour 6 liters of oil through a funnel with a neck 12 cm long and 2.6 cm in diameter. Assume that it is poured in such a way that the oil level is kept just...
  10. M

    U-tube with Equilibrium Configuration

    Homework Statement A U-tube of uniform cross-sectional area, open to the atmosphere, is partially filled with mercury. Water is then poured into both arms. If the equilibrium configuration of the tube is as shown in the figure, with h2 = 1.51 cm, determine the value of h1. I'm not...
  11. M

    Pressure Exerted on Floor

    Homework Statement A 41.1-kg woman balances on one heel of a pair of high-heeled shoes. If the heel is circular and has a radius of 0.698 cm, what pressure does she exert on the floor? 2. The attempt at a solution Pressure is a force applied over an area. The woman has a weight...
  12. M

    Find the magnitude of the acceleration of the two masses.

    Homework Statement An Atwood machine consists of two masses (16.4 kg and a 2.9 kg) strung over a 0.43 m diameter pulley whose moment of inertia is 0.031 kg·m2. If there is a constant friction torque of 0.18 N·m at the bearing, compute the magnitude of the acceleration of the two masses...
  13. M

    Moment of Inertia and Linear/Angular Momentum

    1. Homework Statement . A very thin 1.0 kg disk with diameter 80 cm is mounted horizontally to rotate freely about a central vertical axis. On the edge of the disk, sticking out a little, is a small, essentially mass-less tab, or "catcher." A 1.0 g wad of clay is fired at a speed of 10.0 m/s...
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    Coefficient of Friction. Please Help?

    Homework Statement A skier traveling 12.6 m/s reaches the foot of a steady upward 15.2° incline and glides 12.0 m up along this slope before coming to rest. What was the average coefficient of friction? Homework Equations The Attempt at a Solution D = 12m Velocity initial =...
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    Work Done By Two Mules Please Help

    Homework Statement A barge of mass 5.0×104 kg is pulled along the Erie Canal by two mules, walking along towpaths parallel to the canal on either side of it. The ropes harnessed to the mules make angles of 45° to the canal. Each mule is pulling on its rope with a force of 1.2 kN. How much...
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    Finding the Mass of a Planet

    Homework Statement As an astronaut, you observe a small planet to be spherical. After landing on the planet, you set off, walking always straight ahead, and find yourself returning to your spacecraft from the opposite side after completing a lap of 25.9 km. You hold a hammer and a falcon...
  17. M

    Static Friction on a Curve

    Homework Statement If a curve with a radius of 87.5 m is perfectly banked for a car traveling 71.8 km/hr, what must be the coefficient of static friction for a car not to skid when traveling at 93.8 km/hr? Homework Equations tan \theta = v^{2} / r*g The Attempt at a Solution I...
  18. M

    Net Force and Motion

    Homework Statement The 'net force' in the statements below is the sum of ALL forces acting on the body. True or False 1. During the collision of a car with a locomotive, the locomotive exerts an equal size force on the car as the car exerts on the locomotive. 2. If two objects have...
  19. M

    Block on Incline

    Homework Statement A cube of mass M=0.425 kg is placed on an incline of 12.5* and given a push. It slides down, and its speed down the incline is measured at two positions, [1] and [2] on the diagram below, with V1 = 0.913 m/s and V2 = 1.171 m/s. Note that the incline passes through at least...
  20. M

    Tension and Weight of Ball (Mg)

    Homework Statement A wrecking ball of mass M is suspended by a thin cable (of negligible mass). The ball's position is recorded by a flash camera three times at intervals of 95 ms. For each of the sequences illustrated below, the tension remains constant. Indicate whether the tension in the...
  21. M

    Pulley System and Tension

    The angle is θ = 55.0°. The masses are, for the small pulley, m1 = 3.1 kg, for the traveling pulley, M2 = 5.7 kg, and for the crate, MC = 41.0 kg. What is the minimum tension with which the operator must pull on the cable (assume the cable is of negligible mass) in order to slowly raise the...
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