I have a question regarding motion, cant we move object automatically keeping it at any particular angle?
366895
YOu can! but then you have to waste some energy for putting that object inclined. So you have to consume some energy anyways.
733431
Because there is no absolute reference frame for motion, you can only define uniform motion with respect to a specified coordinate frame.\n\nFor example, a ball falling in a vacuum is not in uniform motion with respect to an earth-fixed reference frame; the ball accelerates.\n\nWhen the forces on an obejct sum to zero, that object is in uniform motion with respect to a reference frame that is non-accelerated. That means that if you compare gravity acceleration between the a frame fixed to the object, and the frame you are wondering about, if the gravity is the same, the frames are not accelerated with respect to each other.\n\nOthers have suggested that uniform motion requires absence of forces. This is not quite true - it requires absence of *net* forces. For example, a car traveling a constant velocity on a highway is not in a force-free environment: you can identify forces of air friction, propulsion from the wheels, weight, and support from the pavement. However it is considered to be in uniform motion with respect to a reference frame fixed to the earth, because all of those forces sum to zero, and because the apparent gravity in a frame fixed to the car is the same as in a frame fixed to the earth.
415527
First of all, the sum is incompleted.  Is it for maximum height, or for range?  Secondly, let us assume you are asking for maximum height.  Then differentiating the given equation of motion, d = -5(t+1)^2 + 258 with respect to 't', we get dt/dt = -10(t+1).  At maximum height, the velocity is zero. \nTherefore, -10(t+1)=0, or t = -1.  This is absurd time can not become negative once the motion is initiated.  Check up there is something wrong in the problem.
1883
Let me give you a chance to answer this question yourself with these two yes/no questions: Do you have to adjust your feet in order to stay in one spot for a long time (having to shuffle your feet to put them back in the correct spot as the earth moves under you?)\n\nOr has your house/appartment building ever slid off its foundation beause the earth moved under it?\n\nWhatever answer you choose, yes or no, that's the answer to your question, for the same reasons.
816746
I can't understand your question but, nothing moves with the aid of gravity, rather, things stop moving because of other forces acting upon them, e.g. drag, friction, etc. In space, there is no gravity (or much much less than on earth), which is why if you set a ball in motion in space, it would theoretically keep going forever, unless something got in it's way.
481919
It is impossible to trisect an arbitrary angle using only compass and straightedge (but bisection is possible). No there is no mathematical technique (i.e a theoretical construction technique to do so, even if impractical). It cannot be done exactly. The best that can be done is approximation. One can imagine, I suppose, a radial arm (our radius rotating about a fixed  point) whose rotation speed was controlled very precisely by a computer and the speed could be extremely slow and a laser could be used with a super accurate quartz timer to 'print' a dot at fixed intervals thus dividing an arbitrary angle as desired. Certainly, technologically feasible, but I haven't heard anything about it, and it would be a technological technique, not a mathematical "breakthrough".
698221
Silly...  The point your instructor is making is that barring any impeding object (air) in the horizontal(to the ground) velocity vector will remain the same (First Law of Motion).  Of course his use of never is inappropriate.  Any thrown object will eventually fall, go into orbit, or escape earth's gravity and fly into space.  At which point the object might encounter another impeding object...\nI recommend that you suggest to your instructor that he reword the question. (Forget trying to get the point).  Explain to him that Newton's First Law states "An object at rest tends to stay in rest and an object in motion tends to stay in motion in a straight line at constant speed unless acted upon by an outside force."...  Notice Newton himself refrains from the use of NEVER and uses the unless clause.  Explain to the instructor that you were using the UNLESS in the 1st Law.  That is to say he did not tell you to ignore gravity or any other impeding objects.  So, tell the instructor that you now understand what he was asking BUT s/he would be better off either taking out the NEVER (which Newton would not have used) with "until it hits the ground."\n\nAddition:\nGiven the Q as a true/false statement and understnading that the question is asking about Newton's First Law and knowing that even Newton says "nisi quatenus a viribus impressis cogitur statum illum mutare." which means "unless acted upon by an external and unbalanced force."  I would say FALSE! \n(The word "never" should not have been used).
394324
Newton's first law of motion states that "An object at rest tends to stay at rest and an object in motion tends to stay in motion with the same speed and in the same direction unless acted upon by an unbalanced force." Objects "tend to keep on doing what they're doing." In fact, it is the natural tendency of objects to resist changes in their state of motion. This tendency to resist changes in their state of motion is described as "inertia".
1171507
Acceleration (A) is a vector. In addition to a value, it also has a direction. As does force (F).\nWhen an object is pushed uphill, A and F have values and the direction is upward (appropriately defined depending on the co-ordinate system used).\nSimilarly, when an object is pushed downhill, F and A point downward.\nSo, yes. It works for objects being pushed uphill and downhill.
473407
An object in motion remains in motion unless it is acted upon by an outside force.  Say you're traveling in a train going 200 miles an hour, jumping on a trampoline.  Before you jump, both you and the train are moving 200 miles an hour forward.  When you jump, you'll begin moving upward at about 5 mph, but you'll still be going 200 mph forward as well, just like the train.  When you come back down, you'll meet the trampoline exactly where you left, because you, the train, and the trampoline have all been moving forward at the exact same speed.  Here's another example:  The circumference of the earth is around 24,000 miles, and the earth completes one revolution per day.  That means that, in one day, you travel in a 24,000 mile circle, yet you don't feel that you are moving because everything else is moving at the exact same speed.
643953
depends on the direction of the force
20369
No. The rotation continues simply because there is nothing to stop it in space.  A free object will continue to rotate along the same axis unless you apply a force to it.
103147
Is this a real-world or mathematically-defined object?  Three dimensional?  Not enough info.\nIf a real object: You can do all sorts of hanging and balancing, but 3D objects, and especially those that are not clean geometric shapes (picture a randomly shaped rock) can be tough, requiring the assignment of a coordinate system, attachment of balancing pivot points, etc.  2D real objects are a snap: Hang from any point, draw a vertical line through the point, repeat at another point; where the lines intersect is the CM.  Here's a neat trick I read somewhere for finding the CM of something long & skinny like a stick:  Hold it horizontal, resting on two small sticks that are far enough apart so the CM is in between.  Slowly move the sticks together; they will meet at the CM!  I think you can do this with a flat 2D piece and three pins if you happen to have three hands.
710256
You got the CG just right.  Your method might work with enough concentration., but I would look at making the angular momentum come to zero:\nL = Iω = (2.7*.325²  + 1.3*.675²) * 26rpm*2π/60 = 2.389 kg m²/s\n\nTo stop the movement the angular impulse must equal the - of the angular momentum:\n\nT * t = L→ T = L/t = 2.389/5.8 = .4118 Nm (ccw)
826674
use conservation of angular momentum in these kind of problems\nNOT energy conservation\nif you dont know how to use the conservation equation, better read up on examples
905757
This is uniform motion, if it is going in a straight line at constant speed.\n\nIf there are no forces acting upon a body, and therefore no acceleration (remember F=ma) or change in direction, nor any change in angular momentum, the motion is uniform. If it were changing direction, accelerating or going round in circles then it is non uniform.
932837
forces are opposite and equal, otherwise you would change speed/direction.