Two people are moving a heavy desk. One person pulls to the right with a force of 25 Newtons, while the other pushes to the right with a force of 50 Newtons. There is also 20 Newtons of friction pointing to the left. What is the net force on the desk? A. 0.5 m/s^2
B. 0 N
C. 55 N
D. 95 N

=force × distance a. work b. velocity c. pressure d. momentum

When a vertical beam of light passes through a transparent medium, the rate at which its intensity i decreases is proportional to i(t), where t represents the thickness of the medium (in feet). in clear seawater, the intensity 3 feet below the surface is 25% of the initial intensity i0 of the incident beam. what is the intensity of the beam "10" feet below the surface? (give your answer in terms of i0. round any constants or coefficients to five decimal places.)

Two pans of a balance are 24.1 cm apart. the fulcrum of the balance has been shifted 1.33 cm away from the center by a dishonest shopkeeper. by what percentage is the true weight of the goods being marked up by the shopkeeper? assume the balance has negligible mass. answer in units of %.