Doppler shifted hydrogen absorption lines are seen in the spectrum of a star. the hydrogen line at 656.28 nm is seen to be shifted to 656.08 nm. the star is moving at which fraction of the speed of light?
a) about 0.3 (3 ã 10â6 )
b) about 0.0003 (3 ã10â4 )
c) about 0.2
d) about 0.03 (3 ã 10â2 )

A17,250 kg rocket is pushed with a thrust of 6,450,284 n. what is the acceleration of the rocket?

Marvin records scientific data about lake superior. for which property has marvin forgotten to use an si unit of measurement? shore length high temperature low temperature annual precipitation

Astone is thrown with a speed v0 and returns to earth, as the drawing shows. ignore friction and air resistance, and consider the initial and final locations of the stone. which one of the following correctly describes the change δpe in the gravitational potential energy and the change δke in the kinetic energy of the stone as it moves from its initial to its final location? options a.δpe = 0 j and δke = 0 j b.δpe is positive and δke is negative c.δpe = 0 j and δke is positive d.δpe is negative and δke is positive e.δpe = 0 j and δke is negative