When a toilet is flushed or a sink is drained, the water (and other material) begins to rotate about the drain on the way down. Assuming no initial rotation and a flow initially directly straight toward the drain, explain what causes the rotation and which direction it has in the northern hemisphere. (Note that this is a small effect and in most toilets the rotation is caused by directional water jets.) Would the direction of rotation reverse if water were forced up the drain?
The Northern Hemisphere's rotation is counterclockwise, just as the Northern Hemisphere's earth rotates counterclockwise.
Yes, the direction of rotation would be reversed if water were forced up the drain.
Water is a colorless, transparent, odorless liquid that makes up the oceans, lakes, rivers, and rain, as well as the fluids that keep living beings alive.
When a toilet or sink is flushed or drained, the toilet or sink becomes an inertial frame of reference. An imaginary force acts in this frame of reference, carrying water or another substance away from the center of rotation, causing it to rotate down the path.
The direction of rotation in the Northern hemisphere is counter-clockwise as the direction of the earth in the Northern hemisphere is counterclockwise. Yes, the direction of rotation would be reversed if water were forced up the drain because the earth rotates clockwise as viewed from the southern hemisphere.
A geosynchronous Earth satellite is one that has an orbital period of precisely 1 day. Such orbits are useful for communication and weather observation because the satellite remains above the same point on Earth (provided it orbits in the equatorial plane in the same direction as Earth’s rotation). Calculate the radius of such an orbit based on the data for the moon in Table 6.2.
Space debris left from old satellites and their launchers is becoming a hazard to other satellites
(a) Calculate the speed of a satellite in an orbit 900 km above Earth’s surface.
(b) Suppose a loose rivet is in an orbit of the same radius that intersects the satellite’s orbit at an angle of relative to Earth. What is the velocity of the rivet relative to the satellite just before striking it?
(c) Given the rivet is 3.00 mm in size, how long will its collision with the satellite last?
(d) If its mass is 0.500 g, what is the average force it exerts on the satellite? (e) How much energy in joules is generated by the collision? (The satellite’s velocity does not change appreciably, because its mass is much greater than the rivet’s.)
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