## In 2004 astronomers reported the discovery of a large Jupiter-sized planet orbiting very close to the star HD 179949 (hence the term “hot Jupiter”). The orbit was just 19 the distance of Mercury from our sun, and it takes the planet only 3.09 days to make one orbit (assumed to be circular). What is the mass of the star? Express your answer (a)in kilograms and (b)as a multiple of our sun’s mass.

January 27, 2020// Blog//

1.

You can never prove a theory. All theories and laws and scientific knowledge in general is provisional. If your theory is inconsistent with an experiment (and you are sure the experiment is correct), your theory needs to be pitched or modified.
2.

change the meters to kilometers;

120 m/km = .12 km/km = .12

or the kilometers to meters;

120 m/km = 120 m/1000m = .12

This sounds like its telling you how far you climb vertically (.12 km) for every 1 km that you walk along the slanted, winding trail.

The unitless number “.12” is usefull because now you can think of the rate of climb in any units you want. So you rise vertcally .12 miles for every mile you walk the trail, or you rise .12 ft for every foot you walk the trail, etc.