Scientists can measure the amounts of different elements found in the universe. Which element's concentration in the universe is evidence for the big bang theory?

A. Helium

B. Uranium

C. Calcium

D. Iron

With your hand parallel to the floor and your palm upright, you raise a 3-kg book upward with an acceleration of 2 m/s2. what is the magnitude of force that your hand exerts on the book while it is accelerating?

What's contact force?

Kara is writing a science-fiction story. In the story, Earth no longer experiences day and night. To return Earth to normal, which action should the heroine of the story take? A. She should get the Sun to travel around Earth again. B.

Which describes how electromagnetic waves travel a. They can only travel through a medium. b. They can travel through a vacuum but not through matter. c. They can travel through matter and through a vacuum. d. They can only travel through matter.

How does energy affect a wave

A long jumper leaves the ground with an initial velocity of 12 m/s at an angle of 28-degrees above the horizontal. Determine the time of flight, the horizontal distance, and the peak height of the long-jumper.

5. George walks to a friend's house. He walks 750 meters North, then realizes he walked too far. He turns around and walks 250 meters South. The entire walk takes him 13 seconds. What is his speed per second?

State the Archimendes' principle

How do you increase the potential energy of an apple

A car weighing 9,800 N was lifted by a crane to a height of 10 m in 60 s. What power was used?