Problem 8: A skateboarder with mass m, = 47 kg is standing at the top of a ramp which is h, = 4.4 m above the ground. The skateboarder then jumps on his skateboard and descends down the ramp. His speed at the bottom of the ramp is vf= 6.4 m/s. Part (a) Write an expression for the work, Wr, done by the friction force between the ramp and the skateboarder in terms of the variables given in the problem statement. Expression : Wf= Select from the variables below to write your expression. Note that all variables may not be required. cos(0), sin(0), a, ß, n, Q, 0, d, g, hy, mg, P, t, Vf, Wf Part (b) The ramp makes an angle 0 with the ground, where 0 = 30°. Write an expression for the magnitude of the friction force, f,, between the ramp and the skateboarder. Expression : F%= Select from the variables below to write your expression. Note that all variables may not be required. cos(0), sin(0), a, ß, A, Q, 0, d, g, hy, m,, P, t, Vf, Wf

Problem 8: A skateboarder with mass m, = 47 kg is standing at the top of a ramp which is h, = 4.4 m above the ground. The skateboarder then jumps on his skateboard and descends down the ramp. His speed at the bottom of the ramp is vf= 6.4 m/s. Part (a) Write an expression for the work, Wr, done by the friction force between the ramp and the skateboarder in terms of the variables given in the problem statement. Expression : Wf= Select from the variables below to write your expression. Note that all variables may not be required. cos(0), sin(0), a, ß, n, Q, 0, d, g, hy, mg, P, t, Vf, Wf Part (b) The ramp makes an angle 0 with the ground, where 0 = 30°. Write an expression for the magnitude of the friction force, f,, between the ramp and the skateboarder. Expression : F%= Select from the variables below to write your expression. Note that all variables may not be required. cos(0), sin(0), a, ß, A, Q, 0, d, g, hy, m,, P, t, Vf, Wf

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

See similar textbooks

Similar questions

Mass of a gold ring is 350mg. Its mass in Sl units is Select one: O a. 350 x103³ g O b. 3.5 x 104 kg O c. 0.350 g O d. 3.5 x 106 kg
Please explain and give the final answer for this problem. I keep getting wrong answers after calculations.
A. 8.66m B. 9.98m C. 16.23m D. 20.52m
2.Recall from class that Ffs < usFN. In your own words, explain why it is an inequality and not an equality. (Hint: Think about varying the angle of incline).
Help with a to c i.
4. A car is driving down a hill that is 2500 feet long and makes an angle of depression of 12°. Find the height of the hill.
If a vector force F = 7 i +10 j +4 k [kN], what will be the coordinate direction angle with the Y-axis: Select one: O a. B = 141.125° O b. B = 83.875° O c. B = 38.875° O d. B = 45°
For #1-4: Given : F₁= 200 N 30° above +x F₂= 200 N, 37° below +x 1. What are the components of F₁? a. x = 173.2 N, y = 100 N c. x = 17 N, y = 190 N b. x = 170 N, y = 90 N d. x = 1700 N, y = 1000 N 2. If the X component of F₂ is 159.7 N, what is its Y-component? a. -119 N b. 120.4 N d. 121.4 N c. -120.4 N 3. What is the magnitude and direction of the resultant force? a. 332.56 N 2.8° below +x b. 323.65 N 3.0° above +x 4. In what direction is F₂ heading? a. 37° below +x b. 35° below-x c. 36° above +x d. 53° below -X c.332.56 N, 3.5° below +x d. 332.56 N, 2.6° below-x
4. Consider again the situation given in Problem 1. (a) Find the center-of-mass of the system made up of m, and m,, taking the origin to be at P. (b) Draw a free body force diagram with the all of the mass (m, + m,) concentrated at this center-of-mass position. (c) Find the torque about P due to (m, + m2) concentrated at this center of mass position. How does this result compare to (d) in Problem 1? [We will make use of this technique often for certain types of future problems.]
1. Give a real world example of the following. A. Something that can be modeled as a vector. B. Something that can be modeled as a scaler.
S1) Please solve the sub-part (b) only, in this question.
3. Find the angle and magnitude of the force below T=300N 200 30kg