Astronomy | Astrophysics Answers

An astronaut sent on a mission to a new planet where the gravitational field strength near the surface is 3.9 N/kg. Using actual mass, find the weight and mass of the astronaut (a) on earth (b) on the new planet and (c) in space.

An aluminum cylinder has a volume of 60ml. Calculate the buoyant force that will be exerted on the cylinder when it is interested in

A. Water

B. Alcohol (density=0.78g/ml)

A balloon has a total volume of 6,000 cm3

and a mass of 3.5 g. Find the buoyant force of the 

air on it, in dyne unit. Note that 1 dyne = 1 g.cm/s2

(Density of air = 0.00129 g/cm3)

A 1 kilogram object is located at a distance of 6.4x10 to the 6th m from the center of a larger object whose mass is 6 by 10 to the 24th kg. What is the force acting between the objects?

At the moment of Transit a clock running on universal time ( UT) read 03h 16min 24s . At the previous midnight the sifereal time was 14 h 38 min 54s . Calculate the Right Ascension of the star

A star is observed to croos the meridian (due south) at an elevation of 34° as seen from an observation sited at latitude 42° north.what is the declination of the star

Astronauts in training are subjected to extreme acceleration forces by the centripetal forces in a giant centrifuge. The radius of the centrifuge is approximately 5 m.

a) Calculate the approximate centripetal force on an astronaut of mass 80 kg if the centrifuge rotates once every 2 s.

b) Approximately how many times greater than the astronauts weight is this force?

Astronauts in training are subjected to extreme acceleration forces by the centripetal forces in a giant centrifuge. The radius of the centrifuge is approximately 5 m.

a) Calculate the approximate centripetal force on an astronaut of mass 80 kg if the centrifuge rotates once every 2 s.

b) Approximately how many times greater than the astronauts

weight is this force?

What force is needed to pull one microscope slide over another at a speed of 1:00 cm/s, if there is a 0.500 my think layer of 20.0 water between them and the contact area is 8:00 cm²?

a 57 degree beam of light impinges on a smooth reflective surface
What is the angle of incidence of the beam?