2. How much of the world's electricity currently comes from coal?

Select one:

a. 25%

b. 40%.

гоо оо.

с. 50%

d. 75%

You place a block of wood on its smallest face on a table. When you turn the block onto its largest face, what changes? OA. Force increases. OB. Temperature decreases. OC. Density increases. OD. Pressure decreases.

Calculate the moment of inertia for each scenario: (a) An 80.0 kg skater is approximated as a cylinder with a 0.140 m radius. (b) The skater extends both her arms, each of which is approximated as a 4.00 kg rod with length 0.

How much energy is needed to increase the temperature of 755 g of iron from 283 K to 403 K?

When Einstein proposed his General Theory" of Relativity, he suggested some pretty strange ideas about space, time, and gravity.

As a truck rounds a curve, a box in the bed of the truck slides to the side farthest from the center of the curve. This movement of the box is a result of? Gravity Inertia Centripetal Force Centrifugal Force

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?