In a railroad classification yard, a 69-Mg freight car moving at 1.5 m/s at A encounters a retarder section of track at B which exerts a retarding force of 36 kN on the car in the direction opposite to motion. Over what distance x should the retarder be activated in order to limit the speed of the car to 4.3 m/s at C? 168 m 3.5 m A B (Vertical scale exaggerated) Answer:x = i m

What is the component of velocity perpendicular to the wall after impact if e = 0.8 and velocity before impact has a magnitude of 50m/s? a. -24m b. 24m с. 50 d. 40 3. 4.

Channel AB is fixed in space, and its centerline lies in the xy plane. The plane containing edges AC and AD of the channel is parallel to the xz plane. The surfaces of the channel are frictionless and the sphere E has 1.9 kg mass. NOTE: This is a multi-part question. Once an answer is submitted, you will be unable to return to this part. N N E 30° x F 20° B ᎠᏓ C 30°/A 30° Determine the force supported by cord EF, and the reactions RC and RD between the sphere and sides C and D, respectively, of the channel. (Round the final answers to four decimal places.) The force supported by cord EF is The reactions RC and Rp between the sphere and sides Cand D. respectively, of the channel are as follows: RC= RD= z N. 4

A particle of mass 0.01 kg is traveling at a speed of 15.5 m.s¹ at an angle of 1.8 radians from the i vector (toward j). A force of 0.02e-0.02t N is applied to the particle at an angle of 3.4 radians from i. Answer all questions to at least 3 significant figures. Enter your numerical answers in SI units but do not enter the units. Determine the j component of the initial velocity [m.s¹] Determine the force in the i direction at t=3.8s [N] What is the i component of velocity at t-3.8s? [m.s¹]

5 T Data/Localy/Packages/ A Read aloud Add text Draw + Page view 3/103 The man and his bicycle have a combined mass of 95 kg. What power P is the man developing in riding up a 5-percent grade at a constant speed of ONJ 19DRU DOT ESTOY SAJ DO 20 km/h? noitoril Jantand A is Jes mon Esta Talloo od: 11 MOS = 160701 sulav odT.8 Jaiog asang babqa eti snimistab .m 8.1 = Alo 3/112 The 54-kg wor seconds. Det up the flight of stairs in 5 er average power output. 8 2.75 m 20 km/h Representar Proble 100 B F8 8 O O 7 F9 ( 9 15 prt sc F10 O ) O home 11 end dynamics Highlight 9°C C

What will be the acceleration (include direction) of this system of blocks connected by rope and pulley"! Mass x = 2.82 kg and mass y = 1.10 kg. Assume that the rightward direction is positive. Ignore any friction in the table or pulley or any elasticity of the rope. 0.59 kg x kg D y kg Round your final answer to the nearest thousandth. Use g-9.81 m/s^2. Include metric units. As always please use "A" for power, as in "ft^2" for square feet.

O 4. Moves downward at constant speed. QUESTION 20 A box of mass 400 kg is supported on a spring scale on the floor of a goods lift. The mass of the lift is 1900 kg. The lift is travelling from the 20th floor to the ground floor. At an instant when the deceleration of the lift is 1.2 ms 2 as it approaches the ground floor, what is the reading recorded by the scale? O 1.351 kg O 2.387 kg O 3.449 kg O 4.461 kg Click Save and Submit to save and submit. Click Save All Answers to save all answers.

The cord is pulled with a force at point A to lift the anvil. The pulley starts from rest. The cord at point A is pulled down 6 ft. Neglect the mass of the pulleys and cords. Hint: 1. The acceleration you find for point A is constant. F₁ A www C W B Values for the figure are given in the following table. Note the figure may not be to scale. Value 15 lb 21 lb Using equations of motion in rectangular coordinates, Variable F₁ W a. Determine the magnitude of acceleration of point B, ap. b. Determine the magnitude of acceleration of point A, aд. c. Determine the time it takes to pull point A down s = 6 ft. Round your final answers to 3 significant digits/figures. Round coefficients in equation/function to 3 significant digits. aB= 66.857 aд 267.428 t = 0.211 X Submit Question X X S Question Help: Video 1% 1%

Two masses are attached by a wire as shown. M2 drops 6 m before hitting the ground. M2 = 60 kg %3! u = 0.1 M1 = 20 kg H = 6 m 0 = 60° a) What is the velocity of the mass when it hits the ground? (Use work-energy)

The coefficient of kinetic friction between the60-kg crate and the ground is uf = 0.3. The crate starts from rest, and P = 225 N .(Figure 1) Part A Determine the velocity of the crate when t = 4s Express your answer to three significant figures and include the appropriate units. HẢ v = Value Units Submit Previous Answers Request Answer X Incorrect; Try Again; 3 attempts remaining • Part B Determine the distance the crate travels when 4 s Express your answer to three significant figures and include the appropriate units. Figure HÀ S = Value Units Submit Request Answer 30° Provide Feedback