By how much does the spring stretch
A spring (k =805N/m) is hanging from the ceiling of an elevator, and a 5.0-kg object is attached to the lower end. By how much does the spring stretch (relative to its unstrained length) when the elevator is accelerating upward at a = 0.47m/s2?
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What is the acceleration of a rising hot-air balloon if the ratio of the air density outside the balloon to that inside is 1.39? Neglect the mass of the balloon fabric and the basket.
Water flows through a horizontal tube of diameter 3.0 m that is joined to a second horizontal tube of diameter 2.2 . The pressure difference between the tubes is 8.0 kpa . Find the speed of flow in the first tube.
The plates each have an area of 2 × 10-3 m2, and the spacing between the plates is 6 × 10-3 m. There is no dielectric between the plates. What is the capacitance of the capacitor?
The ratio of the number of excess electronic charges to the number of molecules on the surface of the tape is the fraction of the molecules on the surface of the tape that have gained (or lost) an extra electronic charge e = 1.6e-19 C.
What are some political/societal issues surrounding drilling for oil in the Gulf of Mexico or other places off the coasts of the US? Please provide any references used.
A 135-kg cannon at rest contains a 9.5-kg cannon ball. When fired, the cannon ball leaves the cannon with a speed of 115 m/s. What is the recoil speed of the cannon?
A 16.5 kg gold bar at 27.0°C is placed in a large, insulated 0.800 kg glass container at 15.0°C with 2.00 kg of water at 25.0°C. Calculate the final equilibrium temperature.
A 11 g bullet is fired into a 11 kg wood block that is at rest on a wood table. The block, with the bullet embedded, slides 5.0 {rm cm} across the table. The coefficient of kinetic friction for wood sliding on wood is 0.20.
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