Car A mass 1200kg, approaches a stop sign at 18 m/s. Car B, mass 800kg, is waiting at this same stop sign when it is rear ended by car A. After the collision their bumpers lock and move into the intersection. Find the velocity of the two cars immediately after the collision.

What color of light must blue light mix with to create white light? a. yellow b. white c. blue d. green

Which of the following changes will increase the capacitance of a parallel-plate capacitor? (there could be more than one correct choice.) a) increase the charge on the plates b) decrease the poten5al between the plates c) increase the potential between the plates d) introduce a dielectric material between the plates e) decrease the separation between the plates

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?