A 5.18 kg block located on a horizontal frictionless floor is pulled by a cord that exerts a force F=12.5 N at an angle = 29.5° above the horizontal, as shown. M 10 What is the speed of the block 3.90 seconds after it starts moving? Submit Answer Tries 0/30
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- PRACTICE IT A skier starts from rest at the top of a frictionless incline of height 20.0 m, as shown in the figure. At the bottom of the incline, the skier encounters a horizontal surface where the coefficient of kinetic friction between skis and snow is 0.209. Neglect air resistance. (a) Find the skier's speed at the bottom. m/s (b) How far does the skier travel on the horizontal surface before coming to rest?B1A 2.1 x 103-kg car starts from rest at the top of a 5.5-m-long driveway that is inclined at 15° with the horizontal. If an average friction force of 4.0 x 103 N impedes the motion, find the speed of the car at the bottom of the driveway. m/s Need Help? Read It MY NOTES ASK YOUR TEACHER
- Physical Sciences P1 (Physics) Gr 12 23 FS/2017 The block moves from point B at a velocity of 4,95 m:s1 up a rough inclined plane to point C. The speed of the block at point C is 2 m:s1. Point C is 0,5 m above the horizontal, as shown in the diagram below. During its motion from B to C a uniform frictional force acts on the block. 4,95 m-s1 2 kg 0,5 m 6.2 State the work-energy theorem in words. 6.3 Use energy principles to calculate the work done by the frictional force when the 2 kg block moves from point B to point C. QUESTION 8 The diagram below shows a bullet of mass 20 g that is travelling horizontally. The bullet strikes a stationary 7 kg block and becomes embedded in it. The bullet and block together travel on a rough horizontal surface a distance of 2 m before coming to a stop. 20 g 7 kg 2 m 3.1 Use the work-energy theorem to calculate the magnitude of the velocity of the bullet- block system immediately after the bullet strikes the block, given that the frictional force…A 3kg block slides along a floor with coefficient of kinetic friction μk=0.3, initially moving at 7.0m/s. It travels for 2.0 meters, then encounters a ramp sloped upward at 40 degrees. The ramp also has a coefficient of kinetic friction μk=0.3. How fast is the block moving when it reaches the bottom of the ramp? How far up the ramp does the block slide, before momentarily coming to rest? a.) For each part of the problem, identify all the forces acting on the block, and draw a free body diagram. b.) Instead of using a Newton’s 2nd Law equation, write out the Work Energy Theorem for each part of the problem (that is the ΔK = W1 + W2 + … equation.) For both parts of the problem, find thework done by each force on the block and place them on the right-hand side of the equation. (In the ramp part, the magnitude of displacement is unknown, so just leave it as a variable.) c.) Solve for the final velocity in the first part of the problem, then solve for the displacement in the second part of…-PROBLEMS- FRICTION Do the following problems. Draw FBDs. Problems 1 - 4: Show work on a separate sheet. Problem 5: Show work on the worksheet. 1. A 1.4-kg block slides across a rough surface such that it slows down with an acceleration of 1.25 m/s2. What is the coefficient of kinetic friction between the block and the surface? 2. At a wedding reception, you notice a small boy who looks like his mass is about 25 kg running part way across the dance floor, then sliding on his knees until he stops. If the kinetic coefficient of friction between the boy's pants and the floor is 0.15, what is the friction force acting on him when he slides? 3. Joshua is playing cards with his friends, and it is his turn to deal. A card has a mass of 2.3 g, and it slides 0.35 m along the table before it stops. If the coefficient of kinetic friction between the card and the table is 0.24, what was the initial speed of the card as it left Joshua's hand? 4. An 18.0-kg box is released on a 34⁰ incline and…
- BOX 1.25m 34 Assuming no friction and the box starts at rest, what will be the speed of the box at the end of the ramp? m/s Word Bank: 4.9 We need the mass to calculate the speed 1.25 20 3.7 4.5 42.5U03Starting from rest, a 93-kg firefighter slides down a fire pole. The average frictional force exerted on him by the pole has a magnitude of 840 N, and his speed at the bottom of the pole is 3.6 m/s. How far did he slide down the pole? ho
- QUESTION 7 From the diagram below, what is the speed of the block when it reaches point A at the lowest point on the surface? 2.00-kg block with an initial velocity of 5.00 m/s down the track Frictionless track В 9.00 m 5.00 m A a. 11.2 m/s b. 9.70 m/s C. 14.2 m/s d. 15.7 m/s е. 12.7 m/sA 149-g baseball is dropped from a tree 15.0 m above the ground. Part A With what speed would it hit the ground if air resistance could be ignored? Express your answer to three significant figures and include the appropriate units. V = Part B for Part A for Part A undo for Part A redo for Part A reset for Part A keyboard shortcuts for Part A help for Part A Submit Value Ffr = If it actually hits the ground with a speed of 7.50 m/s, what is the magnitude of the average force of air resistance exerted on it? Express your answer to three significant figures and include the appropriate units. Units Request Answer Submit for Part B for Part B undo for Part B redo for Part B reset for Part B keyboard shortcuts for Part B help for Part B Value Units Request AnswerA 02 UBC Engineering A trapeze artist of a mass of M to 01 trick. If the ropes do NO work on the artist, what is the speed just before they let go? What is their normal acceleration? 79kg is attempting a new trick on a rope of l 70° and then rope A is cut. The artist holds on until when 02 = 15° then lets go for the next 15m. They are lifted Neglect size and air resistance