Which of the following is a reversible physical change?

a. burning coal

b. boiling water

c. chopping onions

d. bread rising in an oven

How does mass affect average speed?

Which step is not part of a normal convection cycle? A. A high-pressure system forms due to unequal heating. B. Warmed air rises away from the surface. C. Air flows from a high-pressure area to a low-pressure area. D.

By how much does the earth-Sun distance change? 300,000 miles 500,000 miles 3,000,000 miles 3,500 miles

Describe a scientific investigation that can produce scientific data but does not involve expermimentation

A balanced force has a net force of how many Newton's?

Describe how the competition between invasive and native species might affect a food web

Which vector should be negative? any vector whose magnitude is less than 1 a displacement in the direction North any vector whose magnitude is greater than 1 the velocity of a falling object

Acceleration is a scalar quantity true or false

Find a numerical value for rhoearth, the average density of the earth in kilograms per cubic meter. Use 6378km for the radius of the earth, G=6.67*10-11m3 / (kg⋅s2), and a value of g at the surface of 9.80m/s2.

The driver of a car traveling at 32 m/s applies the brakes and undergoes a constant deceleration of 2.25 m/s^2.