A new material has been prepared whose force of resistance to penetration by a sharp object is proportional to the fourth power of the penetration depth, x: F = kx^4, where the constant k = 5.8E10 N/m^4. What is the work, W (in J), needed to force the sharp object 7.5 cm?
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- You are loading a refrigerator weighing 2135 N onto a truck, using a wheeled cart. The refrigerator is raised 1.06 m to the truck bed when it is rolled up a ramp. (Assume that there is no frictional force between the refrigerator and the ramp.) (a) Calculate the minimum work that must be done by the force you apply and the magnitude of the force if the ramp is at an angle with the horizontal of 45.0 degrees. minimum work = force = (b) Calculate the minimum work that must be done by the force you apply and the magnitude of the force if the ramp is at an angle with the horizontal of 10.2 degrees. minimum work = force=a crate with mass m = 23.9 kg being pushed up an incline that makes an angle φ = 19.2 degrees with horizontal. The pushing force is horizontal, with magnitude P, and the coefficient of kinetic friction between the crate and the incline is μ = 0.337. Consider the work done on the crate as it moves a distance d = 4.34 m at constant speed. Part (a) What is work done by the pushing force, in joules? Part (b) What is the work done by friction, in joules? Part (c) What is the work done by gravity, in joules? Part (d) What is the net work, in joules?You have two vectors: A = 7.27î + 3ĵ and B = 4î - 0.95ĵ + 12k. If vector A represents a force vector and vector B is a displacement vector, what is the magnitude of work done by this force?
- A single conservative force acts on the a 5.0 kg object. The equation Fx = 2x + 4 describes the force, where x is in meters. As the object moves along the x axis from x = 1.0 m to x = 5.0 m calculate the work done by this force.An object is moved on a horizontal surface by a force of 15 N up to a distance of 10 m. The force of kinetic friction is 7.5 N. What is the work done by the resultant force?A spring with a spring constant of 18.0 N/cm has a cage attached to its free end. (a) How much work does the spring force do on the cage when the spring is stretched from its relaxed length by 7.60 mm? (b) How much additional work is done by the spring force when the spring is stretched by an additional 7.60 mm?
- You go for a walk one afternoon down a level street to a park where there is a hill. If the hill is 62 meters above street level and 4.6 km from home , how much work in the physics sense do you do in order to get to the top of the hill? Assume your mass is 65 kg and the acceleration of gravity is 9.8 m/s. Give your answer in joules (J).a rope applies a hortizontal force of 180 N to pull a crate a distance of 2 m across a floor. A frictional force of 120 N opposes this motion. What is the total work done on the crate?The graph shows the xx component of a force that acts on an object that moves on the x axis. The vertical spacing between adjacent grid lines is 4.93N, while the horizontal spacing between adjacent grid lines is 1.0m. What is the work, in joules, done by the force as the object moves from x=4m to x=5m?
- A 5.0 kg object has a velocity (5.Oi + 2.Oj) m/s. If its velocity changes to (6.0i - 4.0j) m/s/ what is the net external work done on the object?A tension force of 155 N inclined at 30.0° above the horizontal is used to pull a 35.0 kg shipping crate a distance of 5.10 m on a rough surface. If the crate moves at a constant speed, find (a) the work done by the tension force and (b) the coefficient of kinetic friction between the crate and surface. HINT (a) the work done by the tension force (in J) 688 Forces in the direction of an object's displacement do positive work on the object and tend to increase the object's speed. J (b) the coefficient of kinetic friction between the crate and surface -0 005 Need Help? Read It Watch itA 23 N rock is dropped from a height of 11.5 m, and the velocity right before hitting the ground is 13.50 m/s. What is the work done by the air friction?