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Question 1: It is observed that snow lies stably on roofs with a slope of less than 24°, but that it slides off roofs with a greater slope. Skiers, on the other hand, slide on a snow-covered mountainside with a slope of only 2°. Why is this?
Question 2: A person of weight 100 kg standing on skis 2 m long and 0.10 in wide slides on the 2° mountain slope, at 0°C. Calculate the loss of potential energy when the ski slides a distance equal to its own length. Hence calculate the average thickness of the water film beneath each ski. (The latent heat of fusion of ice is 330 MJ m-3)
Question 3: Give examples, from your own experience, of situations where friction is (a) desirable, and (b) undesirable.
Question 4: Give examples, from your own experience, of situations where wear is (a) desirable, and (b) undesirable.
an industrial water shutoff valve is designed to operate with 30 lb of effort force. The valve will encounter 200 lb of resistance force applied to a 1.5 in. diameter axle. what is the required wheel diameter to overcome the resistance force?
Sketch and annotate the drive train described above. What's the overall system gear ratio? Formula, Substitute/Solve,
a horizontal circular cylinder of diameter d 0.2m and length 2m is elastically mounted on two springs and towing tank
while studying physics in her dorm room a student is listening to a live radio broadcast of a baseball game. she is 1.6
the revolving joint type v of an industrial robot has a range of 240? rotation. the mechanical errors in the joint and
Consider a cylindrical titanium wire 3.0 mm in diameter and 2.5 x 104 mm long. Calculate its elongation when a load of 500N is applied, assuming that the deformation is totally elastic.
Get information about a car engine .drive the ideal performance using the appropriate cycle and compare to the actual performance.
What is the couple moment of the two couples that act on the pipe assembly. The distance from A to B is d = 400 mm.express the result as a cartesian vector.
Why does a car engine stop when we turn the key even when the vehicle is running? The engine should run on alternator in case of a petrol engine and on it's own in case of a diesel engine. Then how does it stop exactly?
You have a bevel gear and shaft and you have to find the maximum load that can be applied on it.
A state runs a lottery in which 6 numbers are randomly selected from 40, without replacement. A player chooses 6 numbers before the state's sample is selected.
a satellite is in earth orbit with an altitude at perigee of 555.0 km and an altitude at apogee of 1200.0 km.a. what is
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