A 1480-N uniform beam is attached to a vertical wall at one end and is supported by a cable at the other end. A 1960-N crate hangs from the far end of the beam. Using the data shown in the figure, find (a) the magnitude of the tension in the wire and the magnitudes of the (b) horizontal and (c) vertical components of the force that the wall exerts on the left end of the beam. (a) Number Units (b) Number Units (c) Number Units
Three charges with q = 7.5 μC are located as shown in the figure. Assume L = 25 cm. a. What is the total electric force on the charge at the bottom? Answer: −5.72 j^N b. What is the total electric force on the charge at the right? Answer: (4.88ı^+2.86ȷ^)N c. Now suppose that an electron is placed at the origin. What is the total electric force on the electron? Answer: −1.73×10−13 j N
Two blocks (m1 = m2 = 10 kg) are connected by a string that passes through a massless pulley as shown in the Figure. The first block with mass m1 on a horizontal floor is connected to a spring with spring constant k = 50 N/m. The spring is initially unstretched and the kinetic friction coefficient between the floor and m1 is μk = 0.25. The system is then released from rest and m1 slides along the horizontal plane. Use energy conservation find the speed of the block m2 just before it hits the ground. (g = 10 m/s2)