A student made the following observations about astronomical bodies.
Observation 1: Mars reverses its direction of motion in the night's sky.
Observation 2: The stars move across the sky.
Which observation(s) can be explained using the heliocentric model but not the geocentric model?
(A)Only observation 1
(B) Only observation 2
(C) Both observation 1 and observation 2
(D) Neither observation 1 nor observation 2
Answers: 2
Physics, 22.06.2019 05:30
Could someone . i have tried to solve myself but my calculation is off
Answers: 3
Physics, 22.06.2019 10:40
As you are trying to move a heavy box of mass m, you realize that it is too heavy for you to lift by yourself. there is no one around to , so you attach an ideal pulley to the box and a massless rope to the ceiling, which you wrap around the pulley. you pull up on the rope to lift the box. use g for the magnitude of the acceleration due to gravity and neglect friction forces. once you have pulled hard enough to start the box moving upward, what is the magnitude f of the upward force you must apply to the rope to start raising the box with constant velocity? express the magnitude of the force in terms of m, the mass of the box.
Answers: 1
Physics, 23.06.2019 00:00
You can melt ice by applying pressure because the solid/liquid line has a slope.
Answers: 3
A student made the following observations about astronomical bodies.
Observation 1: Mars reverses...
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