A small block with a mass of 0.08 kg is attached to a cord
passing through a hole in a
frictionless, horizontal surface
As shown in the Figure. The
block is originally revolving
at a distance of 0.90 m from the hole with a speed of 0.60 m's. The cord is then pulled from below. shortening the radius of the circle in which the block revolves to 0.30 m. At this new distance, the speed of the block is 3.00 ms. The average force of the hand of
the man while shortening the radius of the circle is​

What is the conversion factor between kg/m^3 and g/m^3. express your experimental values for the densities in kg/m^3.

Which graph best represents the relationship between the electric current and the rate at which a magnet is turning inside an electric generator?

Air is held within a frictionless piston-cylinder container, which is oriented vertically. the mass of the piston is 0.45 kg and the cross-sectional area is 0.0030 m2. initially (state 1) the pressure of the gas is sufficient to support the weight of the piston as well as the force exerted by the atmospheric pressure ( 101.32 kpa). the volume occupied by the air within the cylinder in state 1 is 1.00 liter. one end of a spring (with spring constant k = 1000 n/m) is attached to the top of the piston, while the other end of the spring is attached to a stage that can move vertically. initially the spring is undeflected and therefore exerts no force. then the stage is then moved quasistatically downward a distance of 10.0 cm, at which point the system reaches state 2. the piston-cylinder is not insulated; rather it remains in diathermal contact with the surroundings, which are at a constant temperature of 300 k. what is the change of pressure within the container?