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A block of wood has a mass of 3.72 kg and a density of 579 kg/m3. It is to be loaded with lead so that it will float in water with 0.72 of its volume immersed. The density of lead is 1.13 104 kg/m3. (a) What mass of lead is needed if the lead is on top of the wood? .9 kg (b) What mass of lead is needed if the lead is attached below the wood? kg
A roller coaster reaches the top of the steepest hill with a speed of 6.0 km/h. Estimate its speed when it reaches the bottom
A capacitor is connected across an ac generator whose frequency is 746 Hz, What is the magnitude of the maximum charge on one plate of the capacitor
Two polarizers are aligned to the angle between their polarization direction is 45 degrees. what fraction of the incident intensity is transmitted though the second
An electric field of 660 N/C is desired between two parallel plates 17.0 mm apart. How large a voltage should be applied? What is the surface charge density on a plat If total charge Q = 3 μC is to be stored what should be its capacitance? What is th..
A grocery sack can withstand a maximum of 310 N before it rips. Will a bag holding 20.0 kg or groceries that is lifted from the checkout counter at an acceleration of 5.5 hold?
A force of 83 Newtons is applied to a wire with a diameter of 0.5 mm. What is the tensile stress (in N/m2) in the wire
Small particles suspended in the air have a v_rms = 2.8 x 10^-3m/s. What is the mass of one of the small particles
A dielectric-filled parallel-plate capacitor has plate area of 30cm^2 and plate separation of 5mm. The capacitor is connected to a battery that creates a constant voltage of 10V. The dielectric constant is 3. All through the problem, use epsilon_0..
A 0.2kg flying pig toy is attached to the ceiling with a string. When the pig's wings flap, find the angle the string makes with the vertical
consider an object of mass 0.1 kg oscilaating on a spring with an x- component of position given by x = (2m) cos ((5/s)t - pi/6), find the total energy of the mass/ spring system
Lightbulbs with the power ratings giving in the figure are connected in a circuit as shown. Find the power dissipated to each bulb
An observatory has an 8-inch Celestron telescope. Estimate the diffraction limit of this telescope. Estimate the minimum size a feature on the surface of the Sun must have to be resolved by this telescope.
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