The 4,450kg truck is traveling at 30.50m/s when the brakes on all its wheels are applied, causing it to skid for a distance of 22m before coming to rest. Calculate the constant horizontal force developed in the coupling C, as well as the frictional force developed between the tires of the truck and the road during this time. The combined mass of the boat and trailer is 2,250kg * Choose from the choices below.         47.57kN & 141.64kN       51.25kN & 135.88kN

In the picture above, a roller coaster car with a mass of 400 kg rolls through point A with a speed of 20 m/s. What is the force (in N) upward from the track at point A? (Hint: treat the car's motion at point A like uniform circular motion; based on its mass and speed, what force is needed to make it move in a circular path? Add the car's weight to this value.)

A block, m, , is on a frictionless ramp. A rope is attached to this block. The rope goes over a pulley. The other end of the rope is attached to the ceiling. A second block, m, , is attached to a pulley that hangs from this rope. The pulleys are both massless and frictionless. The setup is shown in the image below. (Use 0 = 30°, m, = 40kg and m, =10kg.) %3D What are the magnitudes of the accelerations of each block? b. What is the tension in the rope? а. m, m2

(4) C s) In class, we calculated the minimum speed needed by a ball to maintain contact with the track at the top of a loop-the-loop. In this problem, I want you to calculate the minimum speed the ball must have at the bottom of the loop so it maintains contact at the top. Express your answer in terms of m (the mass of the ball), g, and R (the radius of the loop). v=2

5. You throw a ball of mass m straight up with initial speed vo. (a) What would be the maximum height of the ball if there were no drag force on the ball? (b) Is the drag force a conservative force? Suppose the ball reaches a maximum height that is 80% of the value you found in (a) due to the drag force. With this information, (c) Derive an upper and lower bound on the speed at which the ball will strike the ground. Explain your reasoning! Hint: for the upper bound, pretend there is no drag force on the way down. (d) Explain why the actual speed at which the ball will strike the ground is neither exactly the upper nor lower bound you found in (c).

Hello, I have to record the least value of angle and maximum value of angle when block slides down hill based from my data. Would i find coefficient of friction first for each then arctan times the coefficient for the maximum angle? Fs Fk Mass Gravity Angle  0.12 0.09 512g 9.8 m/s2 7.8° 0.21 0.15 512g 9.8 m/s2 12.8 0.27 0.21 512g 9.8 m/s2 16.2 10.33 0.26 512g 9.8 m/s2 19.3