Monday
May 20, 2013

# Posts by Marth

Total # Posts: 759

physics
d = Vi*t + (1/2)a*t^2 Because the stone is dropped, initial velocity is 0. Acceleration is due to gravity, g=9.81m/s/s. d = (1/2)g*2^2 d=?

physical science
Does taking off the gloves require motion? Which do you think it is?

Physics
This energy is lost to friction when the brakes are slowing the vehicle. In normal cars, this energy is eventually converted to thermal energy. However, in hybrid vehicles, when the car is coasting (no gas) the axis is connected to the battery, slowing the car and recharging t...

statistics
There are 2 possible colors per card: {red, black}. When drawing 2 cards, there are 4 possibilities for the colors: {red-red, red-black, black-red, black-black}.

Physical Science
The satellite is falling around the Earth. Think about centripetal motion. The centripetal force is always directed towards the center, and keeps the object traveling in a circle. Gravity is the centripetal acceleration for satellites in orbit.

math
Find the line through (0, -2) and (5, 8), and find the point on that line where y=0 to find the missing (?, 0).

Algebra
4h^2 + 8h - 5 is a quadratic, so do not factor by grouping. It has only 2 factors. Try (2h + _)(2h - _). (The other possibility is (4h +/- _)(h +/- _). (2h + 5)(2h - 1) gives the +8h we need.

algebra
Slope is the change in y divided by the change in x. Given two points (x1, y1) and (x2, y2), m = (y1-y2)/(x1-x2)

Algebra
You can find irrational factors using the quadratic equation. For ax^2 + bx + c, x = (-b +/- sqrt(b^2 -4ac))/(2a). 6d^2 - 8d - 35 = 0 d = (8 +/- sqrt(64 - 4(6)(-35)))/(2*6)

factoring
The first step in factoring is to move everything to one side. 6d^2 + 2d = 10d + 35 6d^2 - 8d - 35 = 0. However, I cannot find real roots for this equation. Are you sure you typed it correctly?

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