The mantle in the Earth continually heats up and cools down using convection currents.

a. True

b. False

Which of the following are likely to be physical changes to an object? A. the name of the object changed B. the molecules of the object changed C. the smell of the object changed D. the shape of the object changed

Which family on the periodic table is least likely to enter into chemical reactions?

Why does alternating current change direction 50 to 60 times per second?

Angela is analyzing the fracture pattern of a window she know it's at the crack stop when they intersect knowing this what can she determine about the window

What is the kinetic energy of a 55 kilogram skier traveling at meters per second

To determine waves frequency you must know the what

What is the average speed in miles per hour of the car that traveled a total of 200 miles in 5.5 hours

A solid weighs 277.5 g in air and 212.5 g when totally immersed in the liquid of density 0.9 g / cc. Calculate the density of the solid.

Who first described the double-helix structure of DNA?

Suppose you are holding a basketball while standing still on a skateboard you are and the skateboard have a mass of 50 kg you throw the basketball with a force of 10 N what is your acceleration before and after you throw the ball