Some Canadian troops are sent (as part of a U. N. peacekeeping force) to a country located on the Earth's equator. At night, when homesickness makes them gaze sleeplessly at the stars, which of the following will be familiar to them (the same at the equator as in Canada):A) the celestial poles are on the north and south points of the horizonB) the celestial equator is overhead and passes through the zenithC) all stars rise and set (no star remains in the sky all night long)D) all stars are above the horizon exactly half a dayE) none of the above are the same on the equator as in Canada

What is the relationship between the direction of motion of the balloon and the wind currents

In an old-fashioned amusement park ride, passengers stand inside a 3.0-m-tall, 5.0-m-diameter hollow steel cylinder with their backs against the wall. the cylinder begins to rotate about a vertical axis. then the floor on which the passengers are standing suddenly drops away! if all goes well, the passengers will “stick” to the wall and not slide. clothing has a static coefficient of friction against steel in the range 0.60 to 1.0 and a kinetic coefficient in the range 0.40 to 0.70. part a what is the minimum rotational frequency, in rpm, for which the ride is safe? express your answer using two significant figures. f f = rpm

What is the largest meteoroid that has collided with this planet