Does heat always give of heat

How does increasing the amount of charge on an object affect the electric force it exerts on another charged object?

Mass, like weight, always changes depending on its location.

I'm very confused on this home work question How did magnetism 'drive' the theory of plate tectonics?

A spring has a relaxed length of 26 cm (0.26 m) and its spring stiffness is 11 n/m. you glue a 69 gram block (0.069 kg) to the top of the spring, and push the block down, compressing the spring so its total length is 16 cm.

A ball rolls horizontally off a table of height 0.6 m with a speed of 9 m/s. How long does it take the ball to reach the ground? A. 0.067 s B. 0.35 s C. 1.2 s D. 15 s

A car with a mass 1200 kg accelerates at 1.89 m/s2. What is the total force exerted by the car on the road (answer in N to two decimal places) ?

How Long will it take a plane flying north from Miami to reach New York City 1800 km away if the average velocity of the plane is 940 km/h

If vector A = 5.5N NE and vector B = 10m N 30° W, what is the vector product of A*B

Which is the best desciption of a molecule?

What are those that you are wearing?