A 2 kg object is moving west at 4 m/s. It takes 2.0 s to slow down to 2 m/s, still moving west. What is the change in momentum, ΔP, of the object?

a. 4.0 kg∙m/s, west

b. 4.0 kg∙m/s, east

c. 2.0 kg∙m/s, west

d. 2.0 kg∙m/s, east

Which form of energy is a non renewable source of energy l?

Any temperature on the Kelvin scale can be changed to Celsius degrees by?

In hydrogen, the transition from level 2 to level 1 has a rest wavelength of 121.6 nm. (A) Find the speed and direction for a star in which this line appears at wavelength 120.6 nm.

Now try the following three examples: elements formula name barium phosphorus The element barium is an Alkaline Earth Metal, which loses two electrons (2) and phosphorus is in Group V, which gains three electrons (3-). It will have the ending "ide".

Which best describes how magnesium and oxygen bond? a. they form an ionic bond by exchanging two electrons. b. they form an ionic bond by exchanging three electrons. c. they form a covalent bond by sharing one electron. d.

Uranus has more than 14 times as much mass as earth, yet the gravitational force is less. how can that be?

What is velocity-time graph?

Whitch tool could be used to mesure the mass of. a package being mailed

Most of an atom is empty space. a. True b. False

Two ice skaters, Skater X and Skater Y, are at rest on a horizontal surface made of ice. The friction between the ice and the skaters is negligible.