The Spring Stiffness question is worded oddly. There could be two meanings to this question: (1) If you are trying to evaluate the Spring Constant (k) when you know Spring Force (Fs) and displacement (x) - then its a simple matter. For spring force Fs - the smaller the displacment is the stiffer the spring has to be. If the same spring force - stretches the spring much more - then that means you have a 'lighter' spring or a lower k value. (2) If the question meant how do you effect the actual physical/natural spring stiffness - then that is a much more complication question related to Spring Design. That has to do with the material, diameter of spring wire, # of coils, the angle of the helix of the coils etc.,.. Basically- spring stiffness is a natural property of the spring as a product - it doesn't change and is fixed.
That's what I am thinking too. They asked how would it effect the spring if they were to shorten the length of the spring and not compress it. So, maybe they had to answer the question through a design POV view.
I believe K would still increase in case 2(without finding my mechanisms design textbook). you can model the “cut” spring as two springs added in series. When you add two springs in series the combined K is less than the individual k(s). Thus, it is reasonable to assume that the Cut spring will have a higher stiffness than the original.
Shortening a spring doesn't refer to reducing the x value (displacement from the equilibrium position). It's referring directly to the factors that affect the k value. One of those factors is n, which is the number of coils (this is directly proportional to spring length). You can look up the equation for k. Shortening the spring does increase stiffness, so your final answer is correct :)
@@masternobody1896 I don't think its too late. You can always study if you have the time. You can also make engineering a hobby. Basically, make things when you are free and for fun. Don't give up my friend!
There's a great answer on Physics Stack exchange .com: k=Gd^4/8nD^3 where d is the wire diameter, D the coil diameter, n the number of active coils, and G the shear modulus. So if you cut it in half n→n/2 the spring constant doubles k→2k. The maximum length decreases of course and you get into the non-linear regime with less displacement.
Ya I made this video back when I was interviewing for Apple internships. After posting this video, I got to experience Apple full-time interviews and the level of detail and technical questions are tough.
@@arupdey897 full time they mostly won’t ask you textbook questions. Interviewers usually come up with their own questions, and they typically are something like :”I want something like this , how would you design it”. Then you are expected to explain your ideas. Usually there are no right or wrong but that how they evaluate your kills. The thing is interviews are not like taking a exam in school, doesn’t mean u answer everything right and you get the job. You can be an amazing junior engineer but if they thing it’s better to find someone more senior then they won’t move forward
Real talk, his friend looks like the Desi/Arab version of The Weeknd. Ma sha Allah. Does anyone else see it? Very nice video. Currently studying mech eng at Waterloo as well and Apple is the dream in Sha Allah.
With all these technical questions, I'm def not getting a job. This makes me realize that I just sat there in class just to pass & not understand the material🤦🏻♀️😩😫😫😫😫😫
It makes more sense as the years go by. Trust me, in first year, I was lost too on what I wanted to do in life and I couldn’t answer these questions. But, it just starts to make sense by your third year, plus u can always learn more in ur down time.
I asked many interviewrs about if they do technical questions during interview and none of them actually said yes, so this is honestly is kinda not accurate.
With ms in mechanical engineering, can I work in apple as mechanical design engineer? What will be my job description in apple as mechanical engineer? Is electronics knowledge needed to work in apple ? Pls reply
All stainless steels are NOT Magnetic. On your picture - you showed Aluminum and Stainless Steel as the comparison. Stainless Steel alloys come in all varieties: In order for stainless steel to be magnetic - it has to be either Ferritic or Martensitic - like most of the 400 Series Stainless Steels. In most industries - the stainless steel alloy of choice is actually 304 or 316 - both of which are Austenitic. That is NON-Magnetic. I have literally seen young engineers make this mistake in my industry - they automatically assume a part can't be stainless steel if it's not magnetic. That's false.
@@plasmawave2565 That would indeed be an epic day - perhaps - one of the most important days in humanities existance! I'm excited just thinking about it! It can't come any sooner!
@@EngineerHarrisI can't wait either! It's going to be really epic. It's one of the reasons I'm going to do Aerospace this year. Is so cool to know we're going to another freaking planet! What also excites me is the soon to be moon bases. Imagine looking at the moon and seeing city lights! Sooo awesome.
That would have to play into temperature or some other external factor not accounted for in the problem. If so, then this solid is the same density as water
@@nocknock4832Not really, if you know the ratio of the amount submerged to the amount floating which you would have to know in this case, you can find the volume displaced that way.
@@TamerShaheen there is a very weird question asked by Apple : the room is full of balloons after a bday party , tell me 20 different ways to get rid of them .
@@thakursaab4050 It could be an add-on to the mass in the boat question. After you have determined the water level goes down when you release the rock, the interview asks: Is there anything you could release that would cause the water level to go up? (The answer being a balloon!)
The Spring Stiffness question is worded oddly.
There could be two meanings to this question:
(1) If you are trying to evaluate the Spring Constant (k) when you know Spring Force (Fs) and displacement (x) - then its a simple matter. For spring force Fs - the smaller the displacment is the stiffer the spring has to be. If the same spring force - stretches the spring much more - then that means you have a 'lighter' spring or a lower k value.
(2) If the question meant how do you effect the actual physical/natural spring stiffness - then that is a much more complication question related to Spring Design. That has to do with the material, diameter of spring wire, # of coils, the angle of the helix of the coils etc.,..
Basically- spring stiffness is a natural property of the spring as a product - it doesn't change and is fixed.
That's what I am thinking too. They asked how would it effect the spring if they were to shorten the length of the spring and not compress it. So, maybe they had to answer the question through a design POV view.
I believe K would still increase in case 2(without finding my mechanisms design textbook). you can model the “cut” spring as two springs added in series. When you add two springs in series the combined K is less than the individual k(s). Thus, it is reasonable to assume that the Cut spring will have a higher stiffness than the original.
Yep. I went straight to the comments looking for this.
This response makes me so happy haha. That's what I thought too
Shortening a spring doesn't refer to reducing the x value (displacement from the equilibrium position). It's referring directly to the factors that affect the k value. One of those factors is n, which is the number of coils (this is directly proportional to spring length). You can look up the equation for k. Shortening the spring does increase stiffness, so your final answer is correct :)
Hmm that’s a good point, I’ll look into that...thanks for sharing :)
@@TamerShaheen this channel has value
@@TamerShaheen man I am sad that I could not become engineer :(
@@masternobody1896 I don't think its too late. You can always study if you have the time. You can also make engineering a hobby. Basically, make things when you are free and for fun. Don't give up my friend!
There's a great answer on Physics Stack exchange .com:
k=Gd^4/8nD^3
where d is the wire diameter, D the coil diameter, n the number of active coils, and G the shear modulus. So if you cut it in half n→n/2 the spring constant doubles k→2k. The maximum length decreases of course and you get into the non-linear regime with less displacement.
never interviewed as an intern but for fulltime they go way way way deeper into these questions.
Ya I made this video back when I was interviewing for Apple internships. After posting this video, I got to experience Apple full-time interviews and the level of detail and technical questions are tough.
@@TamerShaheen It will be great help if you can continue this series of interview questions for the Full time Job roles also.
@@arupdey897 full time they mostly won’t ask you textbook questions. Interviewers usually come up with their own questions, and they typically are something like :”I want something like this , how would you design it”. Then you are expected to explain your ideas. Usually there are no right or wrong but that how they evaluate your kills. The thing is interviews are not like taking a exam in school, doesn’t mean u answer everything right and you get the job. You can be an amazing junior engineer but if they thing it’s better to find someone more senior then they won’t move forward
What a conceptual question all are very basic questions! ✨
Real talk, his friend looks like the Desi/Arab version of The Weeknd. Ma sha Allah. Does anyone else see it?
Very nice video. Currently studying mech eng at Waterloo as well and Apple is the dream in Sha Allah.
Should do part2
Love this video Tamer! I was wondering where did you source your bullet point time stamps shown in the video from?
With all these technical questions, I'm def not getting a job. This makes me realize that I just sat there in class just to pass & not understand the material🤦🏻♀️😩😫😫😫😫😫
It makes more sense as the years go by. Trust me, in first year, I was lost too on what I wanted to do in life and I couldn’t answer these questions. But, it just starts to make sense by your third year, plus u can always learn more in ur down time.
Thanks guys. SpaceX asked me the rock in the rowboat question, LOL
Tamer and Tauseen to the rescue again! 👌🏽🔥
may I ask if you'll do more of these technical questions?
Nice video man!! When are you going to make a day in a life video
In February
Do a part 2,
I asked many interviewrs about if they do technical questions during interview and none of them actually said yes, so this is honestly is kinda not accurate.
Bro we want interview questions for full-time engineering interviews.
Can you talk more about computer science
Sure, I will. Do you have any specific questions?
Is doing computer science worth it. Like do you have a lot of time when majoring CS, how hard is all of the CS work
HELP :( why do you use in the second exercise for the boat the density of water and for the ball the density of the ball?
In the cantilever beam deflection, I = Moment of Inertia , not area.
Overall great video. Do a part 2
Second moment of area ;)
Yeah, It's second moment of area. If it were moment of inertia, why is there no mass term, derpy-derp?
Do they provide you with equations?
the boat solution was explained so terribly.. but thanks for the question anyway
With ms in mechanical engineering, can I work in apple as mechanical design engineer? What will be my job description in apple as mechanical engineer? Is electronics knowledge needed to work in apple ? Pls reply
All stainless steels are NOT Magnetic. On your picture - you showed Aluminum and Stainless Steel as the comparison.
Stainless Steel alloys come in all varieties:
In order for stainless steel to be magnetic - it has to be either Ferritic or Martensitic - like most of the 400 Series Stainless Steels.
In most industries - the stainless steel alloy of choice is actually 304 or 316 - both of which are Austenitic. That is NON-Magnetic.
I have literally seen young engineers make this mistake in my industry - they automatically assume a part can't be stainless steel if it's not magnetic. That's false.
Love your profile pic. XD
Can't wait for the day when they send actual people to mars. :D
@@plasmawave2565 That would indeed be an epic day - perhaps - one of the most important days in humanities existance! I'm excited just thinking about it! It can't come any sooner!
@@EngineerHarrisI can't wait either! It's going to be really epic. It's one of the reasons I'm going to do Aerospace this year. Is so cool to know we're going to another freaking planet! What also excites me is the soon to be moon bases. Imagine looking at the moon and seeing city lights! Sooo awesome.
Nice
could the ball be somewhat submerged? like heavy enough not to be floating at the surface but light enough to not go to the sea bed?
That would have to play into temperature or some other external factor not accounted for in the problem. If so, then this solid is the same density as water
@@nocknock4832Not really, if you know the ratio of the amount submerged to the amount floating which you would have to know in this case, you can find the volume displaced that way.
You both are so cute
I though it this was a video about apple not how to solve complex problems
It is a video about Apple haha. All they ask in their interviews is these complex questions lol
@@TamerShaheen Thanks for this video! Definitely helps me prep for my interviews. You guys are awesome!
Do you have answer to the balloon question? I’d love to know as I’m facing an interview next week
What balloon question are you referring to?
@@TamerShaheen there is a very weird question asked by Apple : the room is full of balloons after a bday party , tell me 20 different ways to get rid of them .
@@thakursaab4050 Just get the super monkey. Its quick and efficient. XD
@@thakursaab4050 It could be an add-on to the mass in the boat question. After you have determined the water level goes down when you release the rock, the interview asks: Is there anything you could release that would cause the water level to go up? (The answer being a balloon!)
Crazy how these companies want to hire mindless robots that memorize this shit versus cognitive abilities or soft skills
Yeah, some of these questions they ask in job interviews are insane. Especially when the interview itself can already be stressful.