Recent content by easchwen

yes, I meant a plus sign... my mistake! I still am unsure as to what I should do... I am not given angular velocity or linear velocity so I don't know how to find the energy.

Homework Statement A bicycle has wheels of radius 0.25 m. Each wheel has a rotational inertia of 0.096 kg* m2 about its axle. The total mass of the bicycle including the wheels and the rider is 79 kg. When coasting at constant speed, what fraction of the total kinetic energy of the bicycle...

Homework Statement A spring is mounted at an angle of = 38 on a frictionless incline as illustrated in the figure below. The spring is compressed to 15 cm where it is allowed to propel a mass of 5.4 kg up the incline. If the spring constant is 565 N/m, how fast is the mass moving when leaves...

It moves 29 m parallel to the incline... so that's my delta x?

The formula for work that I found in my notes was W=(coefficient of friction)mg(delta x)cos(theta), so would I just use the 14.5 instead of the 25.1147? I know the displacement of the box is 29 m in the diagonal direction, with an angle of 30 degrees. Am I overthinking this problem? I'm still...

The 25.1147 is the 29 m times sin(30), or the change in the x direction. The 14.5 is the change in the y direction.

Homework Statement A crate of mass 20 kg is pushed up a ramp by a person, at an angle of 30 degrees. Assume the coefficient of kinetic friction between the crate and the ramp is k=0.2. Calculate the work done by the person in pushing the crate a distance of 29 m as measured along the ramp...