What does an astronomer mean by "the universe"

select all that apply the force of gravity a. changes slightly with the location on the earth b. decreases with height above sea level c. is unaffected by altitude

What is the circulatory system responsible for

4. A year 11 pupil with a mass of 55kg swinging back on their chair and falling off it at a speed of 0.6m/s. What is his kinetic energy?

What is the acceleration of a 0.30 kilogram ball that is hit with a force of 25 N?

What is neccessary for a magnetic field to create electric current in a copper coil? a. the magnetic field must be moving or changing b. the magnetic field must not be moving c.

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?