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Questions in physics

[Open]On a summer afternoon, the sand on the beach can get very hot. When you step on the sand in bare feet, you can burn yourself. Which of the following sentences best describes how this happens? A. Heat from the Sun is transferred to the sand without direct contact. This heat is then transferred to your feet without direct contact. B. Heat from the Sun is transferred to the sand without direct contact. This heat is then transferred to your feet by direct contact. C. Heat from the Sun is transferred to the sand by direct contact. This heat is then transferred to your feet by direct contact. D. Heat from the Sun is transferred to the sand by direct contact. This heat is then transferred to your feet without direct contact.

[Open]Why should mass not be represented by an arrow?

[Open]The atomic number of an atom identifies the number of protons in its nucleus. If the overall charge on the atom is neutral, what must the atomic number also identify? A. The most common isotope's mass B. The average mass of all isotopes of the atom C. The number of electrons in the atom D. The number of neutrons in the atom

[Open]If a skydiver weighs 800 N, what would air resistance be when he is at terminal velocity?

[Open]What forces act on an apple on a tree?

[Open]How do chemical changes affect our everyday life?

[Open]Vaporization that takes place inside a liquid is called what?

[Open]Write a sentence describing the relationship between volume and time.

[Open]A person walks 30 meters due north, then 50 meters at an angle of 35 degrees. Find their total displacement.

[Open]The type of radioactive decay in which the mass number and atomic number remain unchanged is: A) beta radiation B) alpha radiation C) positron radiation D) gamma radiation