How Do you know if an object has change position

A bullet of mass 20g strikes a block of mass 980g with a velocity u and gets embedded in it. The block is in contact with a spring whose force constant is 100N/m. After the collision the spring is compressed to 10cm. Find: 1.

How do landforms affect surface currents?

How does the law of conservation of mass apply to this reaction:Al+3HCl-->H2+AlCl3

For each situation, identify when sound would travel faster and why? a. Outside on a winter day or outside on a summer day? b. Through water or air? c. When air pressure is high or low? d.

Which of the following occur around powerful magnetic fields within the sun? Auroras Charged particles Eclipse Solar flares

Why is there so much more carbon dioxide in the atmosphere of Venus than in that of Earth? Why so much more carbon dioxide than on Mars?

People have proposed driving motors with the earth's magnetic field. This is possible in principle, but the small field means that unrealistically large currents are needed to produce noticeable torques.

A hot air ballon with a mass of 500kg ascends at a constant rate of 1.5 m/s for 20s. how much work is done by the upward force?

A construction team gives an estimate of three months to repave a large stretch of a very busy road. The government responds that it's too much inconvenience to have this busy road obstructed for three months, so the job must be completed in one

Determine the time needed for the load at b to attain a speed of 10 m/s, starting from rest.