This question was posted on Khan Academy. I attempted it after watching all of their great Work and Energy videos, but the way they arrived at the answer was way above my skill level even after reviewing the videos a number of times. Here is the question:
What is the minimum height h of a slope...
Homework Statement
A star with mass 2.4x1030 kg and diameter 1.7x109 m rotates once every 34 Earth days. It eventually dies and becomes a white dwarf, shedding about half of its mass and contracting to a diameter of 1.9x108 m. If we approximate the star as a perfect sphere, what is its...
PE1 + KE1=PE2 + KE2 becomes PE=KE because, for example, at point C KE1=0 and PE2=0, so I end up using the PE1=KE2 equation.
How am I confusing ΔPE with ΔKE?
Homework Statement
One car (m=80.0 kg) tracks through the roller coaster in the following diagram. As it passes point A, it has a speed of 50.0 cm/s.
a) Determine the speed at points B, C, and E
b) If the speed at point D is _______, determine it's height (ignore friction)
Homework...
Homework Statement
A 2.0 kg block of wood slides over a horizontal surface and comes to rest in 2.5 s. If its initial velocity was 9.0 m/s, what is the coefficient of kinetic friction?
Homework Equations
rho=mv
change in rho=F*change in t
Force of friction = mu*Force normal
Force normal=mg...
1. The problem statement, all variables and given/Information
If a person pushes a 28 kg object 1.2 m, how much work did they just do?
Homework Equations
W=Fd
F=ma
The Attempt at a Solution
If W=Fd and F=ma, then W=(ma)d. The farthest I can get is W=28a*1.2=33.6a. Since the motion is...