49. If an atom contains 13 protons, then it has (2.4)

a. 13 electrons. b. 26 electrons. c. 13 neutrons.

d. 26 neutrons,

A volume of cool air rapidly descends from the top of a mountain. the air is a poor thermal conductor, but its temperature increases as its volume decreases, because of the increase in atmospheric pressure as it reaches the ground.

If I punch a wall, what is the Newton's 3rd Law Pair force?

In a container of negligible mass, 0.400 kg of ice at an initial temperature of - 29.0 ∘C is mixed with a mass m of water that has an initial temperature of 80.0∘C. No heat is lost to the surroundings.

Is oil from diesel a nonrenewable resource or a renewable resource?

Which of the following effects could not be observed for sound waves in air? Choose the correct answer: Interference Refraction Polarization Diffraction

The index of refraction of silicate flint glass for red light is 1.620 and for violet light is 1.660. A beam of white light in this glass strikes the glass-air interface at a 25.50∘ angle of incidence and refracts out into the air.

The locations of the major pressure and wind systems on the earth:

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.?