Recent content by chara76

Thanks for catching that. How does this look? g = (GM)/r^2 --> 15.59=[(6.674x10^-11)(M)] / (7040000)^2 M=1.17275 x 10^25 kg

Ok, this is what I get: g = (GM)/r^2 --> 15.59=[(6.674x10^-11)(M)]/7040000 M=1.6656 x 10^18 kg Is this correct?

Homework Statement An astronaut arrives at a new planet, and gets out his simple device to determine the gravitational acceleration there. Prior to this arrival, he noted that the radius of the planet was 7040 km. If his 0.400-m-long pendulum has a period of 1.0 s, what is the mass of the...

So, Buoyant force + 2.55 N = (mass)*(gravity) Buoyant force = 17.07 N 17.07 N = (density)*(17.07 N)*9.81 density=.101937 Is this right?

Homework Statement A 2.0 kg iron block is suspended from a spring scale and is submerged in a fluid of unknown density. The spring scale reads 2.55 N. What is the density of the fluid? Homework Equations Buoyant force = mass*gravity Buoyant force = (Density of fluid)*(volume of iron...

Added link to picture. Sorry about that

Homework Statement A 345 kg mass is supported on a wire attached to a 15 m long steel bar that is pivoted at a vertical wall and supported by a cable. The mass of the bar is 95 kg. (Take right and up to be positive.) http://img522.imageshack.us/img522/8374/1265alt.gif" (a) With the...

Homework Statement A stationary 3.0-m board of mass 6.0 kg is hinged at one end. A force is applied vertically at the other end, and the board makes a 30° angle with the horizontal. A 50-kg block rests on the board 80 cm from the hinge as shown in the figure below...

Homework Statement You are standing on the edge of a turntable with frictionless bearings. It is initially rotating when you catch a ball, which is moving in the same direction but faster than you are moving and on a line tangent to the edge of the turntable. Assume you do not move relative...