A large box with a mass of 85 kg is pushed with an applied force of 170 N. There is a friction force of 50 N acting on the moving box. What is the acceleration of the box as a result of the net force? (Net force is the Sum of the
forces)

How does the image distance (di) of a convex lens compare with the image distance of a concave lens? a. the image distance of the convex lens is positive, and that of the concave lens is negative. b. both are negative for a virtual image. c. both are positive for a virtual image d. the image distance of the convex lens is negative, and that of the concave lens is positive.

Athin, square metal plate measures 14 cm on each side and has emissivity of 0.60. the plate is heated to a temperature of 745°c. what is the rate at which the plate radiates energy ? the stefan-boltzmann constant is 5.67 × 10-8 w/(m2 ? k4). remember that the plate will radiate energy from both its top and bottom surfaces.

Which type of bond is found between the atoms of a molecule? a. metallic b. delocalized electron c. covalent d. ionic