How far back in time can we see? But 13.8 billion light years is far too small to be the right answer. In actuality, we can see for 46 billion light years in all directions, for a total diameter of 92 billion light years. What is beyond the universe? These 93 some-odd billion light-years contain […]
Does all the ice melt calorimetry?
Does all the ice melt calorimetry? Once all the ice has melted, the temperature of the liquid water rises, absorbing heat at a new constant rate. At 100oC the water begins to boil….Heat and Change in Physical State. Substance Mercury Melting Point (oC) –38.9 ΔHfus, (J/g) 11.8 Boiling Point (oC) 357 ΔHvap (J/g) 272 When […]
Is chromatin made of nucleosomes?
Is chromatin made of nucleosomes? Chromatin is a complex of DNA and proteins that forms chromosomes within the nucleus of eukaryotic cells. Under the microscope in its extended form, chromatin looks like beads on a string. The beads are called nucleosomes. Each nucleosome is composed of DNA wrapped around eight proteins called histones. What are […]
How far did Amelia Earhart fly?
How far did Amelia Earhart fly? 2,000 miles Who piloted the first non-stop flight across the Atlantic? The First Nonstop Flight Across the Atlantic Lasted 16 Harrowing Hours. John Alcock and Arthur Whitten Brown flew across the Atlantic with the help of a sextant, whisky and coffee in 1919—eight years before Charles Lindbergh’s flight. Who […]
What is the direction of magnetic field in a bar magnet?
What is the direction of magnetic field in a bar magnet? Magnetic field lines are defined to have the direction that a small compass points when placed at a location. (a) If small compasses are used to map the magnetic field around a bar magnet, they will point in the directions shown: away from the […]
Is K or Br bigger?
Which one of the following statements about stretching is most accurate?
Which one of the following statements about stretching is most accurate? You should plan a program of stretching exercises that involves most of your joints is the most accurate statement about stretching. You should plan a program of stretching exercises that involves most of your joints is the most accurate statement about stretching. Which one […]
Which system will lift the weight most easily?
Which system will lift the weight most easily? pulley system Where do you see pulleys in everyday life? Examples of Pulleys in Everyday Life Elevators. Elevators work via a powerful electronic pulley system. Wells. Exercise Machines. Construction Pulleys. Theater Systems. What are examples of pulleys in your house? Examples of pulleys that can be found […]
What is the cycle of rain called?
What is the cycle of rain called? As the water vapor rises higher and higher, the cool air of the atmosphere causes the water vapor to turn back into liquid water, creating clouds. This process is called condensation. When a cloud becomes full of liquid water, it falls from the sky as rain or snow—also […]