Friday
December 19, 2014

Posts by Stewart


Total # Posts: 23

Physics
Someone please help me! I've been stuck on this problem for a while now and i can't figure it out! A disk with mass m = 5.2 kg and radius R = 0.44 m hangs from a rope attached to the ceiling. The disk spins on its axis at a distance r = 1.59 m from the rope and at a ...
December 5, 2014

physics
At t = 0 a block with mass M = 5 kg moves with a velocity v = 2 m/s at position xo = -.33 m from the equilibrium position of the spring. The block is attached to a massless spring of spring constant k = 61.2 N/m and slides on a frictionless surface. At what time will the block...
December 1, 2014

physics
A disk with mass m = 5.2 kg and radius R = 0.44 m hangs from a rope attached to the ceiling. The disk spins on its axis at a distance r = 1.59 m from the rope and at a frequency f = 18.6 rev/s (with a direction shown by the arrow). 1. What is the magnitude of the angular ...
November 24, 2014

Physics
An green hoop with mass mh = 2.4 kg and radius Rh = 0.14 m hangs from a string that goes over a blue solid disk pulley with mass md = 2.2 kg and radius Rd = 0.1 m. The other end of the string is attached to a massless axel through the center of an orange sphere on a flat ...
November 10, 2014

physics
An object is formed by attaching a uniform, thin rod with a mass of mr = 6.54 kg and length L = 5.12 m to a uniform sphere with mass ms = 32.7 kg and radius R = 1.28 m. Note ms = 5mr and L = 4R. 1)What is the moment of inertia of the object about an axis at the left end of the...
November 10, 2014

Physics
A uniform disk with mass m = 8.54 kg and radius R = 1.35 m lies in the x-y plane and centered at the origin. Three forces act in the +y-direction on the disk: 1) a force 333 N at the edge of the disk on the +x-axis, 2) a force 333 N at the edge of the disk on the –y-axis...
November 10, 2014

Physics
Every number I have posted is correct. I'm just having problems with 3 and 5. I have access to all of those equations too but i still can't seem to find the right answer. I've been trying for hours and like I said no one i have talked to knows how to do it even my ...
November 7, 2014

Physics
An object is formed by attaching a uniform, thin rod with a mass of mr = 6.54 kg and length L = 5.12 m to a uniform sphere with mass ms = 32.7 kg and radius R = 1.28 m. Note ms = 5mr and L = 4R. 1)What is the moment of inertia of the object about an axis at the left end of the...
November 7, 2014

Physics
A spherical bowling ball with mass m = 3.2 kg and radius R = 0.107 m is thrown down the lane with an initial speed of v = 8.6 m/s. The coefficient of kinetic friction between the sliding ball and the ground is μ = 0.34. Once the ball begins to roll without slipping it ...
November 6, 2014

physics
I was mistaken the answer that I kept getting was 25.1136.
November 6, 2014

physics
A solid sphere of uniform density starts from rest and rolls without slipping down an inclined plane with angle θ = 30o. The sphere has mass M = 8 kg and radius R = 0.19 m . The coefficient of static friction between the sphere and the plane is μ = 0.64. What is the ...
November 6, 2014

physics
A disk with mass m = 8.1 kg and radius R = 0.33 m begins at rest and accelerates uniformly for t = 18 s, to a final angular speed of ω = 34 rad/s. What is the angular acceleration of the disk? What is the angular displacement over the 18 s? What is the moment of inertia ...
November 3, 2014

physics
A bumper car with mass m1 = 100 kg is moving to the right with a velocity of v1 = 4.6 m/s. A second bumper car with mass m2 = 86 kg is moving to the left with a velocity of v2 = -3.8 m/s. The two cars have an elastic collision. Assume the surface is frictionless. 1) What is ...
October 14, 2014

Physics
A satellite is placed 39875 m above the Moon's SURFACE. (M=7.35e22 kg, R=1.74e6 m) Find the Period of the satellite in seconds. (assume a circular orbit)
April 24, 2014

Physics
A certain planet is located 3.54 x 10^11 m from its sun. If its orbital period is 4.9 x 10^7 s, find the mass of its sun.
April 24, 2014

MATHS
Great answer Reiny but line 8 is the wrong way round and should read P=2*L 10x+y-1=2(10y+x-1) but it doesn't change the answer
October 21, 2013

Equation of the Tangent Line
Find the equation of a line tangent to te curve xy = sqrt(xy - x) + 1 at the point (1, 2).
June 5, 2012

Derivatives ~ Calculus
After integrating and solving, I got approximately 4.711393061. Does this seem right?
June 5, 2012

math
solve 3.7^4*x = 9271
February 19, 2012

Social Studies
east and west
November 17, 2011

Math
2 = r cos( – 90°) y ?
September 6, 2011

Physics 30
The answer on my handout is 5.18 x 10^7
January 9, 2011

Physics 30
A radioactive isotope(h=4.5days) was prepared. This isotope was used 14 days later when it had an activity of 6000000 Bq. What was the activity of this isotope when initially prepared?
January 9, 2011

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