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A 1.8-g balloon is filled with helium gas. When a mass of 4.8 g is attached to the balloon, the combined mass hangs in static equilibrium in midair. Assuming that the balloon is spherical, what is its diameter?
the beam shown below has a rectangular cross-section with a width dimension perpendicular to the paper of 0.375 inches
In April 1974, John Massis of Belgium managed to move two passenger railroad cars. He did so by clamping his teeth down on a bit thatwas attached to the cars with a rope and then leaning backward while pressing his feet against the railway ties. T..
if the battery in a circuit is taken out and the current becomes zero. how does the current remain zero without the battery
Two identical conducting spheres, fixed in place, attract each other with a force of 0.083 N when their center to center separation is 45.00 cm. The spheres are then connected by a thin conducting wire. When the wire is removed, the spheres have a..
A cubical piece of heat-shield tile from the space shuttle measures 0.12 m on a side and has a thermal conductivity of 0.072 J/(s m · C°). How much heat flows from the outer to the inner surface of the tile in six minutes
An empty rubber balloon has a mass of .0120kg. The balloon isfilled with heliumat a density of .181 kg/m^3. At this density theballoon is spherical with a radius of .5m. If the filled balloon isfastened to a vertical line, what is the tension in t..
A 26 cm tall object is placed in front of a concave mirror with a radius of 31 cm. The distance of the object to the mirror is 94 cm. Calculate the magnitude of the image height
A boat moves relative to water with a velocity which is n =2 times less than the river flow velocity. At what angle to the stream direction should the boat move to minimize drifting.
What mass can it support in water before sinking. Two concentric spherical shells with uniformly distributed masses M1 = kg and M2 = kg are situated as shown . Find out the magnitude Find the magnitude of the net gravitational force on a particle ..
A point charge q = 1.45 nC is placed in the center of a spherical cavity of an isolated spherical conductor of inner radius 4 cm and outter radius 12cm
How would you determine the density of an irregularly shaped rock, Is buoyant force a conservative force
A two-stage rocket is launched at an initial angle of 83 degrees from the horizontal, and for 15.4 seconds,its engine provides a uniform acceleration in its lauch direction of 25m/s^2. Find the maximum height of the rocket
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