An object has a mass of 20 kg and a coefficient of friction of 0.4. Find the force of gravity (weight) for the mass.

Rank the torques on the five doors shown in the figure above from least to greatest. note that the magnitude of all the forces is the same

Which of the following changes will result in a stronger electromagnet? a. using fewer coils of wire b. using a higher voltage c. using a shorter nail d. using a longer wire

Two students, each riding bicycles, start from the same apartment building and ride to the same building on campus, but each takes a different route. the first student rides 1100 m due east and then turns due north and travels another 1430 m before arriving at the destination. the second student heads due north for 1930 m and then turns and heads directly toward the destination.at the turning point, how far is the second student from the destination?