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Air isn't a perfect electric insulator, but it has a very high resistivity of 3x10^13 omega*m. Dry air has a resistivity of approximately . A capacitor has square plates 10cm on a side separated by 1.2mm of dry air. If the capacitor is charged to 250V, what fraction of the charge will flow across the air gap in 1minute? Make the approximation that the potential difference doesn't change as the charge flows.
A box of mass 72.0 kg is connected to a second box with a mass of 34.0 kg. find the magnitude of the tension in the string between the two boxes
A wheel with radius 43.9 cm rotates 4.27 times every second. What is the tangential speed of a wad of chewing gum stuck to the rim of the wheel
What is the force of gravity between two 1000-kg cars separated by a distance of 25m on a interstate
A 7 kg bowling ball moves at 2.15 m/s. How fast should a 2.40 g Ping-Pong ball move so that the two balls have the same kinetic energy.
An engine of the orbital maneuvering system (OMS) on a space shuttle exerts a force of 2.64×104N j^ over a time interval of 4.50s, What is the impulse of the force for this time interval of 4.50 s
A fully loaded station wagon has a mass of 1690 kg. If each of its four tires is inflated to a gauge pressure of 211 kPa, what is the total tire area in contact with road . What least distance are they from each other? The angle might be too large ..
A student ate a Thanksgiving dinner that totaled 3000Cal . He wants to use up all that energy by lifting a 30-kg mass a distance of 1.0 m. How many times must he lift the mass
An alpha particle (the nucleus of a helium atom) consists of two protons and two neutrons. what is the strength of the magnetic field
A Carnot engine works between temperatutes T1 = 495K and T2 = 302K. What is the Carnot coefficient of performance, KC, of the refrigerator
An electron is accelerated from rest through a uniform electric field of 4000 V/m. How much is the change of potential energy of this electron
A child sits still on a swing that is supported by two chains. Each chain makes a 15.0° angle with the vertical. The child's mass is 25.0 kg. What is the tension in each chain? (Ignore the mass of the seat and chains.)
A circus performer stretches a tightrope between two towers. He strikes one end of the rope and sends a wave along it toward the other tower. He notes that it takes the wave 0.675 s to reach the opposite tower, 20.0 m away. If a 1 meter length of ..
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