consider a system consisting of a rough surface, three masses, two massless strings, and a massless and frictionless pulley. The mass of each block is ma = 25 kg, mb = 18 kg, and mc = 10 kg. The static and kinetic friction coefficients are 0.75 and 0.25 respectively for all surfaces. For parts a and b the masses are given a quick push so that ma is initially moving downwards. a) calculate the magnitude of the acceleration of ma b) is ma slowing down or speeding up? Explain c) calculate the tension in the string between mc and mb. calculate the tension in the string between mb and ma.

An object of mass 3.1 kg with a certain initial speed on a horizontal surface comes to rest after traveling a distance of 15.9 m. If the coefficient of kinetic friction between the object and the horizontal surface is 0.27, what is the initial speed of the object? Express your answer in m/s, to at least one digit after the decimal point. plz use q =9.8

Shown to the right is a block of mass m resting on a frictionless ramp inclined at an angle to the horizontal. The block is held by a spring that is stretched a distance d after the block is attached to it. E k= e wwwwww ▷ A Write an equation for the force constant of the spring in terms of the variables from the problem statement (m, 0, and d). Use g for the gravitational constant.

Problem 1: A 2.80kg block is placed on a rough (us=0.540) incline that makes an angle of 52.0° with respect to the horizontal. A pushing force horizontal to the ground is applied to the top of the block (This would make the force have an angle of 52.0° below the surface of the inclined plane, up the plane) to make the block stationary on the plane. What is the minimum pushing force needed to keep the block stationary on the plane? (10 points)

Many physical properties, such as force and mass, cannot be measured directly. Rather, some other physical property is measured and the desired physical property is computed from the results. For example, a bathroom scale does not actually measure mass or "weight," but rather the compression distance of a spring. The numerical values on the scale are calibrated from the compression distance using basic physics principles such as Newton's second law. Coefficients of friction cannot be measured directly. In this problem, we are going to learn how we can indirectly measure the coefficient of kinetic friction between two surfaces by directly measuring the expansion of a spring. Consider a 5.45 kg5.45 kg block that is dragged by a spring on a (relatively) frictionless horizontal surface at constant velocity. Suppose the block reaches a rough patch and the spring stretches by 5.25 cm5.25 cm. Compute the coefficient of kinetic friction ?μ between the block and the rough patch if the spring…

A toy car is rolling down the ramp as shown in the figure. The car's mass is m = 1.6 kg and the ramp makes an angle of θ = 12 degrees with respect to the horizontal. Assume the car is rolling without friction. A) Using the coordinate system specified given an expression for the acceleration of the car in the terms of θ, g and the unit vectors i and j. B) What is the magnitude of this acceleration in m/s^2

The chain binder is used to secure loads of logs, lumber, pipe, and the like. If the tension T₁ is 3.4 kN when 0 = 33°, determine the force P required on the lever and the corresponding tension T₂ for this position. Assume that the surface under A is perfectly smooth. Assume a = 100 mm, b = 460 mm. T₁ Answers: P = T₂ = i i 9 A B KN 2 KN 2 b Topoces T₂

A 1.80x10^4 kg semi-trailer truck drives up a 200 m hill [θ = 30 degrees above horizontal], at a constant speed of 25.0 m/s. The force of friction is 6.00x10^2 N. Write an equation to isolate and solve for P.

We often think of friction and air resistance as forces that we want to minimize because they can hinder the motion of an object.  But they are not always undesirable, and in fact, can be an essential element in a machine or process. Identify one or two applications that depend on friction and air resistance.  Explain how friction or air resistance works in those situations and what would happen if there were no friction or air resistance.  Your initial post should be 75-150 words in length and is due on Sunday.

In the Skycoaster amusement park ride, riders are suspended from a tower by a long cable. A second cable then lifts them until they reach the starting position indicated in (Figure 1). The lifting cable is then released, and the riders swing down the circular arc shown. Figure Part A 15° Tleft = If the four riders have a total mass of 350 kg, what is the tension in the left cable just before release? Express your answer with the appropriate units. μA 26° Value Units 1 of 1 ?