Who is doing work.

A Becky studies for her test. B Bob carries a baby across the hall C sally pushes a stroller around the block D Ben holds a plank for one minute

Two passengers are on a moving sidewalk at the airport. Passenger A is standing still while passenger B is walking with a speed of 2.0 km/h. The sidewalk is moving west at a speed of 1.5 km/h.

Most restaurants serve justice serving sizes for one person true or false

Marcia pokes fun at her husband Brian because he loves to sing in the shower every morning, but his singing is terribly off-key. On the other hand, Brian teases Marcia for talking so loudly when she's on the telephone.

An exercise program that lacks specific goals is failing what fitness principle?

As a data acquisition anti-alias filter, an RC Butterworth filter is designed with a cutoff frequency of 100 Hz using a single-stage topology. Determine the attenuation of the filtered analog signal at 10, 50, 75, and 200 Hz

The first law of thermodynamics states that ΔE = Q - W. Is this also a statement of the principle of conservation of energy? Yes, the heat added and the change in internal energy of the gas equal the work done by the piston.

How can we calculate the density of a sustance that has irregular volume

A two stage rocket leaves its launch pad moving vertically with an average acceleration of 4 m/s2. at 10 s after launch the first stage of the rocket (now without fuel) is released.

A liquid filled sealed system has cylinders with movable pistons on each end. The face of one piston has an area of 5 cm². The other piston has an area of 500 cm² and is supporting a weight of 2 kN on it.

A turntable is spinning on a frictionless axle when a ball of putty is dropped onto it from above. The putty sticks to the turntable when it lands. Is angular momentum conserved for the turntable and putty (the system) during this process?