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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
How is specific gravity measured?
Specific gravity is the ratio of the density of a substance to the density of a reference substance, typically water for liquids and solids, and air for gases. Specific gravity can be measured using a hydrometer, which is a device that consists of a weighted glass or plastic tube that floats in the liquid. The hydrometer has a graduated scale that is used to read the specific gravity of the liquid. Another method is to use a digital density meter, which uses electronic sensors to measure the density of the substance. In this method, the substance is placed in a container and the electronic sensors measure the weight and volume of the substance to calculate its density and specific gravity.
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An object with a mass of 21kilograms is lifted through a distance of 7 meters How much work is done?
use the formula W = mgs
W stands for work done in joules
m stands for mass of the object
g stands for gravity
s stands for the distance the object is lifted
W = mgs
W = 78kilograms•9.8m/s2•6meters
W = 4586.4 J (joules) answer would be 4,586.4 J
torque = twisting force. The torque of a propeller aircraft engine (single engine) tends to rotate the aircraft in the opposite direction as the propeller rotation, causing the aircraft to turn in that direction.
What is the velocity of a wave with a wavelength of 0.03m and a frequency of 120hz?
The velocity of the wave is equal to 3.6 meters per second.
Strain is the change in dimensions per unit original dimensions. For example, if your stretch a 100 cm long wire by 5 cm, Strain = 5/100 = 0.05
How is work force and distance related?
Work done = resistance force * distancetravelled
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Say acceleration due to gravity = 9.8 (m/s)/s
Say you lift 100 kg vertically up 0.5 metres:
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calculate resistance force
f = m * a = 100 * 9.8 = 980 newtons
then: work done =
980 * 0.5 = 490 n-m (joules)
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if you want power , divide answer by time taken, say it took 0.5 seconds, then:
490 / 0.5 = 980 watts.
Is a fork an example of a wedge?
No, a fence is not an example of a wedge. A fence post could be a wedge if it is pointed and designed to be pounded into the ground.
What are the advantages to a bladed Golf Club?
Unless you are a brilliant ball striker, the only real advantage is that they look great in the bag. A high handicapper will struggle to get a good strike with one because the sweet spot is so small. The advantage for someone like Tiger Woods is that when he hits a shot he will get superior feel and a lot more control over the ball.
Can the axle of a bike be put in backwards?
lever at crank, connected by chain to lever at rear wheel
32meters
Would the earth's curvature be seen from top of Burj Dubai?
It is impossible to see the curvature of the earth from the first three layers of the atmosphere...
Also, it is impossible to see the curvature of the earth from an aeroplane (which flies up to 28,000 feet) whereas the Burj Khalifa's spire reaches only 2,723 feet.
Hence proved, we cannot see the curvature of the earth from the Burj Kahlifa...
Ofcourse, you can go there and try it yourself...
How are a lever and a wheel and axle similar?
To find the Mechanical Advantage you would have to divide.
The equation for Lever is: MA = Length of effort arm
--------------------------------
Length of resistance arm
The equation for Wheel and axle is: MA = Diameter of wheel
-------------------------
Diameter of axle
OR
MA = Diameter of axle
-----------------------
Diameter of wheel
* Depending on where the force is applied.
A wheel is just like a bunch of levers arranged in a circle with the fulcrum at the center of the wheel. The axle is like the short end of the lever.One degree of rotation of the axle results in one degree of rotation of the wheel; this is just like rotating the short end of the lever to movethe long end.
An example of sliding friction?
when michael phelps dives into a pool of water a force called fluid friction pulls him back slightly.
Which causes primarily by the gravitational force between earth and moon?
There is insufficient information in the question to answer it. You did not provide the list of "these". However, it seems obvious that the answer is the tides of the oceans are caused by the gravitational force between the Earth and the Moon, with the Sun also a significant part. Also, it is known that the Moon tends to keep the alignment of the Earth's axis with respect to the plane of the ecliptic relatively constant, stabilizing our seasons.
If the Earth shrunk to half its size what happens to Earth's original mass?
Assuming the earth is a sphere, it corresponds to the rule that M is proportional to radius^3 - shrinking the radius by half, we see: (1/2)^3 = 1/8, the earth has shrunk to a mere eighth of it's mass.
The portion between the fulcrum and the effort applied in a lever is called effort arm.
The Four Fundamental Forces are: * Gravity * Electromagnetism * Strong Nuclear Force (holds nucleus together) * Weak Nuclear Force (neutrino interactions induce beta decay) Most common forces like friction and drag and just objects pushing other objects are electromagnetic forces.
What does motion to continue mean?
A motion for a continuance means the same thing in a divorce case as any other civil case. The Movant is requesting the judge push off a hearing or the trial itself. If there is no objection by the other side, a continuance hearing isn't necessary however if the other side objects, the judge in the case will hear from both sides and decide if a continuance is warranted.
How does net force affect acceleration?
The net force acting on an object is directly proportional to its acceleration, according to Newton's second law of motion. When the net force increases, the acceleration of the object increases as well. Conversely, when the net force decreases, the acceleration of the object decreases.
What increases when the average Kinetic energy of the particles in a material increases?
The average kinetic energy of colliding particles can be increased by increasing temperature.
What is a disadvantage and advantage of use an equation instead of a graph or table?
Advantage: Graphs provide a more visual representation.
Disadvantage: Equations are usually more accurate.
