General Physics Exam 2 || Already Graded A+.

If an object has zero acceleration, then correct answers there can be any number of forces acting on it, as long as the sum of those forces is zero. If the sum of forces on an object is zero, then correct answers it moves in a constant direction at constant speed. A double trailer combination on the highway (figure above) consists of two 23×103 kg trailers towed by a 12×103 kg "tractor truck". If the truck accelerates at 0.11 m/s2 over level ground, what is the forward force on the rear trailer? Ignore air friction. correct answers 2.5×10+3 N What is the force exerted on the first trailer by the tractor truck? correct answers 5.1×10+3 N forward The backward force of the tractor truck's wheels on the ground is correct answers 6.4×10+3 N An object moves in a circle at constant speed. Which statement below is correct? correct answers The acceleration and velocity are perpendicular to each other, with the acceleration pointing in to the circle. A grapefruit hanging from a tree weighs 8.85 N. The force of gravity exerted on the earth by the grapefruit is correct answers 8.85 N The grapefruit falls from the tree. The force of gravity exerted on the earth by the grapefruit as it falls is correct answers 8.85 N A football quarterback carries the football towards the goal line at an initial speed of 2.1 m/s. The quarterback's feet apply a force of 607 N to the ground. An opposing player applies an opposing force on the quarterback such that the quarterback's acceleration is 0.85 m/s2 away from the goal line. If quarterback's mass is 135 kg, what is the magnitude of the force exerted by the opposing player? correct answers 7.2×10+2 N, calculated from (607 N) - (135 kg)·(-(0.85 m/s2 )) What is the farthest distance forward the quarterback goes before being stopped? correct answers 2.6 m, calculated from (02 - (2.1 m/s)2 )/(2·(-(0.85 m/s2 )))