A500 kg car traveling at 20 m/s, brakes and skids to a stop. if μk = 0.7 between the tires and the road, the acceleration of the car during the skid is:

a. -0.7 m/s2

b. -7.0 m/s2

c. -2.0 m/s2

d. -0.2 m/s2

Aheavy boy and a lightweight girl are balanced on a massless seesaw. the boy moves backward, increasing his distance from the pivot point. what happens to the seesaw? it is impossible to predict without knowing additional information. the side the boy is sitting on will tilt downward. the side the girl is sitting on will tilt downward. nothing; the seesaw will remain balanced.

2) the sun is wonderful source of energy. it is renewable and natural with few dangers. solar cells rely on the sun for energy. these cells would be more practical to use if they were

The electric field inside a battery generates an electric potential difference of 12v. the plates are seperated by a distance of 0.25m. what strength of the electric field?