196 watts Well first, we need to calculate the work done. Work is defined by the equation W=F*d F is the force in newtons (N) d is the distance in metres (m) So, we need to find the weight of the object to get the force. It is given by the equation W_"object"=m_"object"*g, where g is gravitational acceleration W_"object"=25kg*9.81=245.25N~~245N m=8m (given) :.W=245N*8m=1960N \\ m = 1960J So A thick cable, 60 ft long and weighing 180 lb, hangs from a winch on a crane. Compute in two different ways the work done if the winch winds up 25 ft of the cable. Write a function for the weight of the remaining cable after x feet has been wound up by the winch. Estimate the amount of work done when the winch pulls up Δ \Delta Δ x feet of cable. Calculate the work done. Solution: Use WD = F x d d = 0 because the boulder does not move = 2000 x 0 so WD = 0 If an object does not move when the force is applied then no work is done. Work is only done if the object moves. Gravitational Potential Energy Whenever we lift up an object we are providing a force to act against gravity. When the bottom 4.00-kg block is pulled to the left by the constant force P →, P →, the top 2.00-kg block slides across it to the right. Find the magnitude of the force necessary to move the blocks at constant speed. Assume that the coefficient of kinetic friction between all surfaces is 0.400. Example 9.5.2 How much work is done in lifting a 10 pound weight from the surface of the earth to an orbit 100 miles above the surface? Over 100 miles the force due to gravity does change significantly, so we need to take this into account. (10-h)^2/25\Delta h$ kilograms of water, where $\sigma$ is the density of water in kilograms per Potential Energy Kinetic Energy Mechanical Energy Power In a previous part of Lesson 1, work was described as taking place when a force acts upon an object to cause a displacement. When a force acts to cause an object to be displaced, three quantities must be known in order to calculate the work. .

find the work done when a 25 kg weight