A block is sitting on a platform 20 m high. It weighs 50 kg. How much potential energy does it contain?

Which statements accurately describe elements? Elements are made up of two or more types of atoms. Elements are made up of only one type of atom. Each element has a unique chemical symbol. Þ Elements can be identified by their àtomid number.

What are fossil fuels

How the forces are working?

A system is a group of many simple parts and processes that influence or interact with each other. The human body is a system that is made up of many organ systems.

A rock group is playing in a bar. Sound emerging from the door spreads uniformly in all directions. The intensity level of the music is 116 dB at a distance of 2.82 m from the door.

A car rounds a 75-m radius curve at a constant speed of 18 m/s. a ball is suspended by a string from the ceiling the car and moves with the car. the angle between the string and the vertical is:

A wave has a wavelength of 7 mm and a frequency of 9 hertz. What is its speed?

Which statement best describes the effect of scientific advances on society? A. They always have a positive impact on society. B. They are inspired by the needs of society. C. they do not affect society beyond the community level. D.

Which is the best example of reusing? repairing a stove instead of buying a new one wearing a pair of pants made from cotton buying a toy packaged in paper instead of plastic placing a glass bottle in the recycling bin

The sunlight hits the surface of a lake this will like caused a. condensation b. transpiration c. evaporation d. sublimation