A 82.1 kg person stands on a scale. what normal force does the scale exert on him? (Unit = N)

A newly discovered solar system is found 600 billion kilometers from the sun. How many AU does this represent? Show your work.

For each situation, identify when sound would travel faster and why? a. Outside on a winter day or outside on a summer day? b. Through water or air? c. When air pressure is high or low? d.

Explain how the atom is a part of the electrical current process.

Which of the following is a physical quantity that has a magnitude but no direction? a. vector b. scalar c. resulant d. frame of referance

Recently a catastrophic event has occurred in Iceland due to the movement of Earth's plates. It has heated a glacier, causing flooding in the country, and has caused many flight cancellations in neighboring European countries.

Which of these is not a source of the shock waves that lead to protostars?

Which kind of information is known about a person if that person's DNA is in a database? A. how old the person is B. where the person was probably born C. some diseases the person might have D. whether the person is likely to commit a crime

A science teacher ran a marathon. After the race she showed her students the silver blanket she was given to keep her warm. A group of students investigated how the colour of the blanket affected how much infrared radiation is absorbed

Students asked to measure the temperature of a reaction beaker recorded the following temperatures. 103.7°C, 108.4°C, 105.8°C, 104.6°C The actual temperature is 105.1°C. Which measurement is the most precise

Two atoms that are isotopes of one another must have a different number of what? electrons neutrons protons all particles