How does mechanical energy relate to the work an object can do

Can matter exist as a mixture of two or three phases? five an example

A person wearing rollerblades starts from rest and accelerates at a constant rate. She reaches a speed of 13 mph (5.18 m/s) exactly 18.0 s later. a. What is the magnitude of their average acceleration (in m/s2) ? b.

A lander vehicle on a distant planet records the fact that it takes 2.86s for a ball to fall freely 11.66m, starting from rest. What is the acceleration due to gravity on that planet? Express your answer in m/s^2. I am getting - 1.

What is 2,000m to km

The city bus traveled 30 miles in 30 minutes. What was its speed in mph? A. 2 mph B. 60 mph C. 16 mph

Which is the satellite Terra able to do? A) Monitor the movement of comets and meteorites B) Monitor seismic activity on the moon C) Monitor the orbit of Mars D) Monitor volcanic eruptions on Earth

Which statement best describes a risk associated with using radioisotopes in nuclear reactors? A Radioisotopes are very expensive and do not produce the amount of energy that coal and oil produce.

Batteries should only be removed from the premises by a licensed battery hauler for recycling. A) True B) False

If the density in an object is 30 g/cm3 and it's volume is 10 cm3 what is the mass in grams

A star of uniform mass with a radius R rotates about its diameter with angular momentum L. Under the action of internal forces the star collapses until its radius is one fourth of its initial size.