Homework Statement
The mass of the sun is 2x10^30kg and the planet Jupiter averages an orbital distanceof 5.2 AU. Calculate the orbital speed (in mph) and orbital period (in Earth years) of Jupiter relative to the Sun: One AU is one Astronomical Unit which is the average earth-sun distance...
Homework Statement
Prove that A*B = |A||B|cos theta
Homework Equations
Law of cosines: c^2= a^2 + b^2 - 2abcostheta
Property of a dot product; x*x=x^2
Replace c^2, a^2, and b^2 with dot product
The Attempt at a Solution
c*c=a*a+b*b-2abcostheta
since c=a-b
c*c= (a-b) * (a-b)
c*c=...
Homework Statement
For a system (with frictionless pulley) Mewsubk = .25 and the system is initially at rest. The mass of block 1 is 16 kg and the mass of block 2 is 12 kg. Determine the minimum coefficient of static friction needed to prevent any movement.
Homework Equations
F=ma...
Homework Statement
A 30 kg hanging mass is supported by three cables and is in static equilibrium. The tension in the center of the vertical cable is 126 N. A free body diagram is given with the one cable making an angle of 15 deg and another cable making an an angle of 40 deg. Determine the...
Homework Statement
An object with mass 5000 grams starts from rest and its motion is described by the horizontal position vector given. Determine the force acting on this object at the time t=9sec:
x(t)=(.01/3)t^4-(.08sqrt(t^5))
Homework Equations
F=ma
The Attempt at a Solution...