Which of the following lists the composition of the Earth's outer core?

A. calcium, potassium

B. silicon, aluminum, calcium, sodium and potassium

C. iron, nickel

D. oxygen, magnesium, iron, aluminum, and calcium

If it takes 200 joules of energy to lift a bucket of water 3 meters in 2 seconds, how much power would be required to do the same amount of work in 5 seconds?

Protons are made up of ___ up quark (s) and ___ down quark (s). a. 1, 1 b. 1, 2 c. 2, 1 d. 2, 2

You are using an electric motor that requires 40 volts to operate. The motor's circuit uses only 5 amps of direct current. How much power is being used?

How does a projectile differ from an object in free fall?

How did advances in technology open the way for world exploration?

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