Which of the following is false? question a., light energy from the sun warms the surface of the earth’s continents and the ocean. choice b., approximately 50% of the sun’s light energy does not reach the surface of the earth. choice c., the earth radiates heat energy back to the atmosphere. choice d., much of the heat that is lost from the earth’s surfaces is re-radiated back into the atmosphere by greenhouse gases. choice e., the greenhouse gases in the atmosphere have all come from human activity

The intensity, or loudness, of a sound can be measured in decibels (db), according to the equation , where i is the intensity of a given sound and is the threshold of hearing intensity. what is the intensity, in decibels, [i(db)], when ? use a calculator. round to the nearest whole number. 8 9 19 80

How can you increase the strength of an electromagnet?

Simon is writing a story about an astronaut whose spacecraft has been boarded by space pirates. the astronaut has her lucky penny in her hand behind her back as the space pirates break into the control room. she has just locked the controls so that the ship is accelerating in the direction of the control room’s ceiling. simon wants the astronaut to use the penny to hit a button on the control panel to turn off the lights and escape. the button is located a short distance behind and below the astronaut’s hands. how should simon use the theory of relativity to describe what the astronaut must do in order to hit the button?