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Mechanics
Mechanics is the branch of physics that deals with the interactions of objects and forces in the observable world. Questions asking about projectile motion, conservation of energy, and calculus based mechanics are perfect for this topic, but questions about repairs that a mechanic would do belong in our vehicles categories.
2,416 Questions
Why do you write Torque equals Nm but not Torque equals mN?
The second version (mN) would likely be confused with milli-newton.
If the speed is constant, then the forces on the crate are balanced, i.e. they add up to zero.
Since the kinetic friction force is 10N, then the puller must be pulling the crate with an equal force of 10N.
If he continues pulling with the force of 10N through a distance of 10 m, then the work he does is
(10 x 10) = 100 newton-meters or 100 joules.
The mass of the crate is utterly irrelevant to the discussion.
Yes, it is. The only thing is that it is the force that resists sliding or rolling of one solid object over another.
The loudness of a sound is the wave?
The loudness of a sound wave is proportional to the amplitude of the wave, which is to say, the size of the vibration.
Why do you say a blob of putty is inelastic?
All materials except for liquids and gases have elastic and inelastic responses when subjected to forces.
An elastic response means that an object will return to its original (pre-force) shape when the force is removed, while an inelastic response means that the object will not return to its original shape.
While putty can behave elastically, it can only do so under very small forces, much smaller than what it usually experiences. Since almost any "real world" force will permanently distort putty, it is usually described as inelastic.
The general formula for distance traveled under uniform acceleration is:
S = v0t + at2 / 2
In our case, the initial velocity is in opposite direction that acceleration.
Let's choose a direction of our axis of displacement: let it face downwards. In this coordinate system, v0 will be
v0 = -9.75 m/s (converted from 32 ft/s)
a = g = 9.81 m/s2
Our formula will then take form:
S = -9.75 * 11 + 9.81 * 112 / 2 = 486.26 m
or in feet: S = 1595.32 ft
What effect does pressure have on a bottle rocket?
it pushes the rocket into the air to make it go higher.
Can amplitude and loudness increase - when two sound waves become out of phase?
If they were originally phased to maximize amplitude, no; otherwise, yes
If the two waves are of different frequencies, the sound will be loudest when the wave peaks are synchronized, and quietest when the wave peaks and troughs are synchronized. This effect is called beat*, and can be more noticeable as the difference in frequencies becomes smaller since, up to a doubling of amplitude (loudness) is possible, in the resulting composite wave.
If they're the exact same frequency (pitch), the loudness can double to maximum, when the wave peaks are exactly synchronized, or, at minimum loudness, be canceled out entirely, when the peaks and troughs are exactly synchronized. All other values fall between these two conditions. The maximum and minimum effects depend on how the two waves are phased.
*This effect can be more noticeable as the difference in frequencies becomes smaller, since nearly a doubling of amplitude (loudness) is possible in the resulting composite wave.
Describe an experiment for the verification of newton's second law of motion?
Newtons second Law: Force applied on a body is directly proportional to the rate of change of momentum of the body or mass times acceleration (when proper units are chosen, (F = ma). If you change the mass of an object on a (frictionless) surface and apply a constant force the body will acellerate differently. The Mass: a bunch of identiacl items that you can count (metal nuts) in a container with a flat (plastic bottom) Frictionless surface: Flat (wet) glass Force: a spring or rubberband you pull out to a given length befor letting the mass go. Acelleration (stroboscopic photograph, "ticker tape" with constant period marking dots on a paper ribbon... the experiment: Measure the acelleration with mass#1. Repart with twice, three times, four times the mass. Result: Plot the results on log graph paper.
coefficiant
What are the forces involved in a trebuchet?
Thurst, Gravitiy, Potential Energy, Kinetic Energy, and a few other.
What is the working principle of a engine and explain?
The working principle in an engine is to compress gasoline in a mixture with air in the piston chamber and ignite it with a spark that comes from the spark plug. When the fuel is ignited the preassure makes the piston go back down.
This up and down movements of the pistons make the engine move the transmition to move the wheels for movement.
Since v1 = vo + uloge(Mo/M)
For first stage ,Mo = 800+90+100+10 = 1000 kg; M = 90+10+100 = 200 kg
And vo = 0 and u = 1.5 kmsec-1
So, v1 = 0 + 1.5 loge(1000/200) = 1.5 loge 5 = 1.5 x 2.3 log10 5 = 2.415 kmsec-1
This will be the initial velocity for the second stage.
For second stage,Mo = 100kg; M = 10 kg, vo = v1 = 2.415 kmsec-1.
Thus, v2 = v1 +uloge(Mo/M)
= 2.415 + 1.5 loge 100/10 = 2.415 + 1.5 x 2.3 log10 (10) = 5.865 kmsec-1
So the final velocity achieved by the rocket = 5.865 kmsec-1
A decibel meter...
the question is... do you really need to because i doubt you have a decibel meter
Is 150 pound-feet of torque much different from 100 pound-feet?
for a given lever length the force is (150 / 100) times greater
torque = force (pounds) * lever length (feet)
Would it be possible to bend time if one were able to manipulate gravity?
It would not be possible to bend time even if you could manipulate gravity because gravity relies on the earths magnetic core, as gravity dose on any planet. If it were possible to manipulate gravity you could in theory change the mass of an object, but gravity has no effect on time. Time is something humans you to measure events and the duration between them. Time itself is not a thing, nor is it an event, in itself not measurable thus making time travel or the bending of time not possible.
