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1. An airplane wing is designed so that the speed of the air across the top of the wing is 259 m/s when the speed of the air below the wing is 193 m/s. The density of the air is 1.29 kg/m3. What is the lifting force on a wing of area 21.0 m2?
2. A mercury barometer reads 738.0 mm on the roof of a building and 760.0 mm on the ground. Assuming a constant value of 1.29 kg/m3 for the density of air, determine the height of the building.
Take element Z = 21 from the periodic table. Ionize it 20 times so that there is only one electron left orbiting around the nucleus. What is the ground state energy of the electron
Consider a charge of +1 nC (nanocoulombs, or Coulombs ×10?9) at (-3, -4) m, and a charge of -2 nC at (12, -5). Calculate the electric field strength at the origin
A man pushes a 16kg block from rest to speed v doing 1200 j of work in the process, during this time, find the horizontal force exerted on the block
a capacitor is connected across the terminals of an ac generator that has a frequency of 448 Hz and supplies a voltage of 21 V. Find the capacitance of the second capacitor.
Block A of mass 3 kg slides into block B of mass 2 kg. Before collision, block A moves to the right with speed 10 m/s and block B is stationary, what is the kinetic energy change for the system
A moon orbits a planet of unknown mass with a period of 1.8 days. If the radius of the moon's orbit is 420,000,000 meters, find the mass of the planet
What is the speed of the bowl? The speed of sound is 340 meters per second.
A 128-cm-long pipe is stopped at one end. Near the open end, there is a loudspeaker that is driven by an audio oscillator, What is the lowest frequency of the oscillator that will produce resonance within the tube
A rock is tossed straight up with a speed of 29 m/s. How long is the rock in the air, from the instant it is released until it hits the bottom of the hole
An object 2.0 cm high is placed 45 cm from a concave mirror of radius 10 cm and radius of curvature 60 cm. Find the location, size, and orientation of the image
If you charge a pocket comb by rubbing it with a silk scarf, how can you determine if the comb is positively or negatively charged.
A large block of copper initially at 20.0oC is placed in vat of hot water (80.0oC). For the first 1.0 J of heat that flows from the water into the block, find the entropy change of the water
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