George walks to a friend's house. He walks 750 meters North, then realizes he walked too far. He

wrns around and walks 250 meters South. The entire walk takes him 13 seconds. What is his speed

per second?

2. A 75.0 kg astronaut is training for accelerations that he will experience upon reentry. He is placed in a centrifuge (r = 10.0 m) and spun at a constant angular velocity of 15.3 rpm. Answer the following: a.

When did most of the cratering on the moon occur?

How do you determine the amplitude of a transverse wave

Which sphere of Earth includes icebergs? atmosphere biosphere cryosphere geosphere C. Cryosphere

If a force is perpendicular to the displacement of an object, the object will rotate in a circular path. True or False

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?