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A lighter-than-air spherical balloon and its load of passengers and ballast are floating stationary above the earth. Ballast is weight (of negligible volume) that can be dropped overboard to make the balloon rise. The radius of this balloon is 5.90 m. Assuming a constant value of 1.29 kg/m3 for the density of air, determine how much weight must be dropped overboard to make the balloon rise 128 m in 28.0 s.
A coil having L=0.14 H ,R=12? is connected across a v=110v, f=25Hz line. Compute a power factor and power
A thin, uniform, metal bar, 3 m long and weighing 90 N, is hanging vertically from the ceiling by a frictionless pivot. Find the angular speed of the bar just after the collision
A carbon dioxide laser is an infrared laser. A CO2 laser with a cavity length of 53.00 cm oscillates in the m=100,000 mode. What is the wavelength of the laser beam
An oscillating LC circuit has a current amplitude of 7.10 mA, a potential amplitude of 250 mV, and a capacitance of 200 nF. What is the maximum energy stored in the capacitor
A 10 ohm resistor and a 20 ohm resistor are connected in parallel. What is the equivalent resistance of this setup
When tightening a bolt, you push perpendicularly on a wrench with a force of 161 N at a distance of 0.120 m from the center of the bolt. How much torque are you exerting
One argument against Darwin's theory of evolution draws upon the second law of thermodynamics. Does this mean that organisms violate the Second Law of Thermodynamics
An object is placed in front of a converging lens in such a position that the lens (f = 17.0 cm) creates a real image located 27.0 cm from the lens. What is the image distance of this new image
A 65-g ice cube at 0°C is placed in 665 g of water at 30°C. What is the final temperature of the mixture? °C, What is the final temperature of the water after the ice has melted
Estimate the shear stress if this force is ex- erted on a 0.412 cm -thick pine board that is 13.7 cm wide
A solenoid that is 75 cm long produces a magnetic field of 1.4 T within its core when it carries a current of 7.6 A. How many turns of wire are contained in this solenoid
An air-filled parallel-plate capacitor has plates of area 2.70 cm2 separated by 2.00 mm. The capacitor is connected to a 18.0-V battery. What is the magnitude of the uniform electric field between the plates
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