Why is coal costly to produce?

1. coal is found deep underground.

2. Coal is expensive to make

3. Coal is only found in certain places on earth.

4. Coal is difficult to make in the lab.

A 15 kg child experiences an acceleration of 0.25 m/s2 as she is pulled 1.7 m horizontally across the floor by her sister. what is the change in the child's kinetic energy?

At what speed relative to the ship does she recoil toward the spaceship?

What is the variable that changes in response to the manipulated variable?

Would you expect light to bend if it entered corn oil at an angle after it traveled through glycerol? Explain.

An inductor is connected across an ac source. suppose the frequency of the source is doubled. what happens to the inductive reactance of the inductor?

What is the speed of a car going v=1.000mphv=1.000mph in SI units? Notice that you will need to change from miles to meters and from hours to seconds. You can do each conversion separately.

What made it possible to construct skyscrapers in the 1800s

A 4.0-kilogram object is accelerated at 3.0 meters per second2 north by an unbalanced force. The same unbalanced force acting on a 2.0-kilogram object will accelerate this object toward the north at (1) 12 m/s2 (3) 3.0 m/s2 (2) 6.0 m/s2 (4) 1.5 m/s2

Religion, astrology, and handwriting analysis are all believed in and used by many people. How are they different from psychology?

A ball is thrown straight down a at 10.0 m/s from a 32.4 m-high building. How long does it take to reach the ground? What is the speed the moment before it hits the ground?