Help me please 3. A skateboarder with a mass of 55.0 kg prepares to skate a down a ramp with an angle ofincline of 0= 35.0° and a coefficient of kinetic friction of 0.300. At the bottom of theramp it turns into a quarter-pipe with a smooth surface (negligible friction). Theskateboarder pushes off at the top of the ramp at a height of h with a speed of 3.00 m/s.The maximum height they reach on the quarter pipe is 1.75 m (vertical height).a. What is their speed when they leave the ramp?b. From what height h on the ramp did they start?h

PE at the top of of the ramp = mgh friction force = μmg cosθ KE at the top = 12mv2 frictional work…

Answered: What is their speed when they leave the…

Engineering

Mechanical Engineering

What is their speed when they leave the ramp? From what height h on the ramp did they start?

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

See similar textbooks

Similar questions

a. A vehicle with the handbrake drawn must be pushed and moved. The vehicle weight is 1200 kg, and the force required to push the vehicle is 300 kg (G=10 m/s2 can be taken). Determine the value of the coefficient of friction that occurs when the wheels of the car make a sliding movement on the asphalt. As the car is pushed and moved, the speed of the car increases to 3.6 km/h. Find the power spent on friction b. An oil film was formed under the wheels while the same vehicle was pushed with the handbrake drawn, and the vehicle thrust was reduced to 6 kg (G=10 m/s2). Determine the value of the coefficient of friction that occurs between the molecules of the lubricant. The speed of the vehicle increases to 3.6 km/h when the vehicle is moved by pushing on the oil film. Find the power spent on friction
Task 2 (a) The sports car, having a mass of 1900 kg, travels horizontally along a 20° banked track which is circular and has a radius of p= 100 m. If the coefficient of static friction between the tires and the road is 4, = 0.2, determine the maximum constant speed at which the car can travel without sliding up the slope. Neglect the size of the car. (b) Find all the forces on the car of part (a). (c) If the car is treated as a rigid body, draw the free-body-diagram. Task 3 Provide a practical application of three interconnected rigid bodies such that two of them rotate about a fixed axis and the third one has translational motion. Assume the dimensions of the three bodies, and speeds and accelerations of the two rotating rigid bodies. Find the speed and acceleration of translating rigid body.
A box slides from rest from point A down a plane inclined 30 degrees to the horizontal. After reaching the bottom of the plane, the box moves on the horizontal floor at a distance of 2 m before coming to rest. If the coefficient of friction between the box and plane and between the box and floor is 0.40, what is the distance of point A from the intersection of the plane and the floor?
A light plane of mass 1200 kg makes an emergency landing on a short runway. With itsengine off, it lands on the runway at a speed of 35 m/s. A hook on the plane snags acable attached to a 130 kg sandbag and drags the sandbag along. Now you can consider thesystem as a combined mass along with the sandbag and the plane.Now, the coefficient of friction between the sandbag and the runway is μk = 0.4, and also theplane’s brakes give an additional retarding force of magnitude 1400 N. So our target for thisproblem is to find how far does the plane go before it comes to stop.Assume, when the plane snags the sandbag, the collision is instantaneous.[Hints Think carefully whether you can apply conservation of momentum or not] Find the speed of the plane and sandbag immediately after the collision.
Problem: A person on a bicycle of mass 85 kg ( including the bicycle) can slow down at velocity of 3.60m/s? safely without skidding when approaching the next stop on the road. a. Draw the free-body diagram, including all the forces that apply to the problem. b. How would the free body diagram look on the person one the bike if the road was inclined uphill at 18 degrees? How would its deceleration change if the road was increased to 18 degrees? c. If the bieyelist elimbs up the hill at a speed of 8.0km/h because of the air resistance. What force would be necessary to climb the hill at the same speed with the same air resistance?
A child goes down a playground slide that is inclined at an angle of 24.5°below the horizontal. Find the acceleration of the child given that the coefficient of kinetic friction between the child and the slide is 0.375
A bicycle and rider, travelling at 12 km/hr on a level road, have a mass of 105 kg. A brake is applied to the rear wheel, which is 800 mm in diameter. The pressure force on the brake is 80 N and the coefficient of friction is 0.06. Find the distance covered by the bicycle and the number of turns of its wheel before coming to rest.
A 150 kg. block rest on a rough horizontal floor. The coefficient of kinetic friction between the block and the floor is 0.20. Compute the horizontal force applied on the block if the block has a velocity of 5 meters per second at the end of 4 seconds.
Shown below are coplanar forces F1 and F2 pulling on a 1.0 - kg block which ismoving at constant speed on a horizontal surface. If the coefficient of kineticfriction between surfaces is 0.2, what is the magnitude of F2?
A mini bus weighing 30 kN goes around a plane curve of 70 m radius. The distance between inner and outer wheel is 1.5 m and the center of gravity is 1 m above the road level. Take coefficient of friction µ = 0.4. Evaluate the following: a) The limiting speed of the mini bus on this curve. b) The normal reactions developed at the inner and outer wheels if the mini bus negotiates the curve with a speed of 50 km/h.
A skier of mass 'M' Kg starts fron rest down the hill inclined at angle 0', He skies distance 'D' meter down the hill and then coasts tor *X' meter along level snow uptil he stops. Find the coefficient of kinetic friction between the skier and the snow.
Block A has a weight of 60 lb and block B has a weight of 10 lb. Neglect friction and the mass of the cord and pulleys. The figure shows a system of pulleys and blocks. Block A is located on an inclined surface with a slope of three-fourths. Block B is vertically suspended by a cord that goes over a pulley located at the top end of the inclined surface. The cord then goes downward and to the left, parallel to the slope, then it goes over a pulley fixed to the upper right end of block A. Then the cord goes upward and to the right parallel to the slope. The end of the cord is fixed to the anchor. Determine the speed of block A after it moves 5.7 ft down the plane, starting from rest.