What is a star's main fuel during its lifetime? A. hydrogen B. carbon C. helium D. oxygen

3. When does the iron core in an electromagnet become magnetic?

The difference between experimental technique and procedure

You are making raised beds for a productive vegetable garden and have 4 boxes that are 1m x 2m x 1m deep. What volume of dirt (in cubic meters) will you need? How many cubic feet is that?

a stone is thrown by a person from the top of the building, which is 200m tall. at the same time, another stone is thrown with verlocity of 50m/s by a person standing at the foot of the building. find the time after which the two stones meet.

Is the centripetal force and scalar or a vector?

Which statements correctly describe the properties of heat? Select all that apply. Heat is an essential component of life on Earth. Heat is energy that flows from one object to another. Heat flows from a hotter object to a colder one.

A book is sitting on a table at rest. Which of the following best describes the forces acting on the book? A.

When NASA's Skylab reentered the Earth's atmosphere on July 11, 1979, it broke into a myriad of pieces. One of the largest fragments was a 1770-kg lead-lined film vault, and it landed with an estimated speed of 120 m/s.?

A spring gains 2.34 joules of elastic potential energy as it is compressed 0.250 meter from its equilibrium position. What is the spring constant of this spring? (1) 9.36 N/m (3) 37.4 N/m (2) 18.7 N/m (4) 74.9 N/m

Form hypothesis: Where do you think we humans get energy?