Wednesday
May 22, 2013

# Posts by Nolan

Total # Posts: 34

physics
A physics professor lifts her 9.0-kg briefcase at constant speed with an upward force. Find the magnitude of her force.

physics
Actually I didn't know that formula haha. Thanks!

physics
A 32.0-kg penguin on frictionless ice holds onto the end of a horizontal spring with spring constant 250 N/m and oscillates back and forth. What is its period of oscillation?

physics
A 50-kg penguin stands on ice. A helium balloon is attached to the penguin by means of a harness and pulls upward with a force of 90 N. What is the normal force of the ice on the penguin?

physics
A physics professor lifts her 9.0-kg briefcase at constant speed with an upward force. Find the magnitude of her force.

Math
How do we know the ith of an invertible matrix B is orthogonal to the jth column of B^-1 , if i is not equal/unequal to j?

Math
What is the simplified sum when you evaluate 10/15 + 1/4

12th grade
Id say... b

algebra 1
x^2-18x+___=( )^2

12th grade agebra 2
For the first one : You put X = x² Then you have (variable change) : X² - 6X + 8 = 0 And you use common tools to solve that (use delta). You find X = 2 or X = 4. You have x² = X, so x = sqrt(X) or x = -sqrt(X). Here, the solutions are sqrt(2), -sqrt(2), 2, -2. F...

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