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A modern-day zeppelin holds 8,310 m3 of helium. Calculate its maximum payload at sea level. (Suppose the helium and air to be at 0°C and 1 atm.)
To empty a flooded basement, a water pump must do work (liftthe water) at a rate of 2.00 kW. If the pump is wired to a 240-Vsource and is 84% efficient, how much current does it draw
Consider a concave mirror with a focal length of 18.90 cm. Find the location of the image when the object is 10.20 cm from the mirror. What is the magnification of the image? What is the radius of curvature of the mirror in cm? Is is virtual and u..
A ball having a mass of 170 g strikes a wall with a speed of 5.0 m/s and rebounds with only 50% of its initial kinetic energy. find the speed of the ball immediately after rebounding
A child in a boat throws a 3.50 kg package out horizontally with a speed of 15m/s. Calculate the velocity of the boat immediately after, assuming it was initially at rest. The mass of the child is 25kg and that of the boat is 70kg. Ignore water re..
A cannonball is shot (from ground level) with an initial horizontal velocity of 36 m/s and an initial vertical velocity of 21 m/s. What is the initial speed of the cannonball
Two blocks with masses m = 16.7 kg and M = 70.1 kg are not attached. The coefficient of static friction between the blocks is 0.45 but the surface beneath M is frictionless. What is the minimum force F required to hold m against M?
UV light of wavelength 211 nm falls on a silver surface whose work function is 4.74 eV. Find the maximum speed of the photoelectrons emitted from the surface
King Arthur's knights fire a cannon from the top of the castle wall. The cannonball is fired at a speed of 50 m/s and at an angle of 35°. What is the ball's maximum height above the ground
The plates of a 3.1 nF parallel-plate capacitor are each 0.27 m^2 in area. If the plates are separated by a Teflon sheet, how thick is the sheet
Two blocks are free to slide along the frictionless wooden track shown below. The block of mass m1 = 5.06 kg is released from the position shown, at height h = 5.00 m above the flat part of the track. Protruding from its front end is the north pol..
In one hand you hold a 0.12 kilogram apple, in the other hand a 0.29 kilogram orange. Find the magnitude of the force of gravity in the apple exerts on the orange
A spherical balloon expands when it is taken from the coldoutdoors to the inside of a warm house If its surface areaincreases 16.0% by what percentage does the radius of the balloon change
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