Why is it that the properties of pure substance do not vary from sample to sample

A fisherman and his young son are in a boat on a small pond. Both are wearing life jackets. The son is holding a large helium filled balloon by a string.

Asher cycles 12 miles in 16 hours. What is his speed?

A bat hits a moving baseball. If the bat delivers a net eastward impulse of 0.80 N-s and the ball starts with an initial horizontal velocity of 3.8 m/s to the west and leaves with a 5.

Given a maximum magnetic field gradient of 40 mt/m and magnetic field of 3t, how homogenous must the magnet be (in parts per million) to enable a spatial resolution of 1 mm to be acquired.

You are using a rope to lift a 14.5 kg crate of fruit. Initially you are lifting the crate at 0.500 m/s. You then increase the tension in the rope to 150 N and lift the crate an additional 1.15 m.

Describe two ways that Floridians can be negatively affected by a natural disaster

What would happen if cranial nerve IV was damaged.

Acceleration of an object depends on its mass and applied force

Is it possible to do work on an object without changing the kinetic energy of the object? Now Why? a) Yes, it is possible by raising the object to a greater height without acceleration.

What does the sun consume to produce energy and helium?