Suppose a logs mass is 5kg .after burning, the mass of the ash is 1kg .explain what may have happened to the other 4kg

What type of light does this light bulb produce most (i.e. at what wavelength does the spectrum have maximum intensity)?

Which simple machine is not part of this compound machine? a. lever b. pulley c. inclined plane d. wheel and axle

Aperson stands on a platform, initially at rest, that can rotate freely without friction. the moment of inertia of the person plus the platform is ip. the person holds a spinning bicycle wheel with its axis horizontal. the wheel has moment of inertia iw and angular velocity ωw. take the ωw direction counterclockwise when viewed from above. part a what will be the angular velocity ωp of the platform if the person moves the axis of the wheel so that it points vertically upward?