What is the magnetosphere?
a. a stream of electrically charged particles flowing at high speeds from the sun
b. the region of earth's magnetic field shaped by the solar wind
c. a glowing region in the atmosphere caused by charged particles from the sun
d. the angle between geographic north and the magnetic pole in the northern hemisphere

You are your friend move a new refrigerator into his kitchen. you apply a horizontal force of 252 n in the negative x direction to try and move the 56 kg refrigerator. the coefficient of static friction is 0.61. (a) how much static frictional force does the floor exert on the refrigerator? give both magnitude (in n) and direction. magnitude n direction (b) what maximum force (in n) do you need to apply before the refrigerator starts to move?

Acopper sheet has a volume of 100 cm³. if the density of copper is 8.9 g/cm³, what is the mass of the sheet? a. 11 g b. 8.9 g c. 189 g d. 890 g

Describe the work performed by a ski lift in terms of kinetic and gravitational potential energy