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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
Relationship between location of the center of the gravity and stability?
If you drop a line straight down from the center of gravity of the bridge and it falls inside the base of the bridge, the bridge is in stable equilibrium; it will balance. If it falls outside the base, it is unstable.
How do you drop an egg using a parachute - without cracking the egg?
How about use a plastic cup drill holes on both sides use a string put through the holes tie the ends to a plastic bag and, voila, a parachute for the egg.
More Information:
The parachute must be big enough and of appropriate material to slow the fall of the egg and the parachute. Also, a nice soft field might be a better landing zone than a paved parking lot. Some trial and error experimentation will probably be necessary to get the right chute area to weight ratio. Don't start with the egg.
Can your sneeze go up to 100 miles per hour?
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Mike's average velocity was 4 miles per hour when he ran ten laps around the school's one-fourth mile track in 15 minutes. This is calculated by first finding the total distance he covered (10 laps * 0.25 miles per lap = 2.5 miles) and then dividing it by the total time taken (15 minutes = 0.25 hours).
Difference between homogenous and heterogenous mixtures?
In a homogeneous mixture the components are spread evenly throughout one another and any two random sample of the mixture will be identical.
In a heterogeneous mixture the components remain separated into "phases" and the composition of the mixture varies throughout.
For example, in muddy water the soil particles remain distinct from the water.
A current carrying solenoid tends ot contract why?
A current-carrying solenoid contracts due to the magnetic fields created by the current. The interaction between the magnetic field produced by the current and the magnetic field within the solenoid causes a net force on the solenoid itself, resulting in contraction. This phenomenon is described by the Lorentz force law.
What do we call the tendency of a object to stay at rest or to stay in motion?
We use the term inertia to describe the resistance of an object to any change in its motion. If an object is not moving, it doesn't want to move. If it is moving, it doesn't want to change is speed or the direction it is moving. This is covered by Newton in his laws of motion.
What is 7ft pounds of torque measured in inch lbs?
To convert 7 ft-lbs to inch-lbs, you multiply by 12 (since there are 12 inches in a foot). Therefore, 7 ft-lbs is equal to 84 inch-lbs of torque.
How long does it take to boil 2 gallons of 70 degree fresh water with 12500 BTU at sea level?
A BTU is a unit of energy, and (assuming you mean degrees Fahrenheit) 12500 BTU is not enough energy to boil two gallons of water. Doesn't matter if you put it in within the space of a second, or spend an hour doing it. That's not enough energy.
What is 4 hp in mph what is 4 hp in mph?
Horsepower (hp) is a unit of power, whereas miles per hour (mph) is a unit of speed. There is no direct conversion between horsepower and miles per hour because they measure different things. Horsepower tells you how much power an engine produces, while miles per hour tells you how fast something is traveling. The speed of a vehicle in mph depends on various factors such as engine power, weight, aerodynamics, and gearing.
Why is it necessary to mention the axis of rectangular bar while calculating the moment of inertia?
An object rotating about its long axis will have a different moment of inertia than when it is rotating about its short axis.
A solid disk will have a different moment than a washer, and there are formulas derived for calculating the moments of many common shapes.
What is a thrust for the jet engines?
Thrust is the force produced by a jet engine or any propulsion system that propels an aircraft forward. It is generated by expelling high-velocity exhaust gases in the opposite direction to the desired motion, following Newton's third law of motion. The amount of thrust generated by an engine directly affects the speed and performance of the aircraft.
How does the phenomenon of interference play a role in the production of bow or shock waves?
Interference occurs when two or more waves overlap and either reinforce or cancel each other out. In the case of bow or shock waves, interference can amplify the pressure fluctuations and energy of the waves, resulting in the characteristic patterns and intensities found in these types of waves. This interference phenomenon is crucial in understanding the complex dynamics of wave propagation in fluid dynamics.
I can't be sure, but I think you're asking about 'G's ... that press you back into
your seat when you mash the gas pedal, and press the astronauts into their
couches during lift-off.
'G's are not a speed at all. They refer to an acceleration. That means how fast
speed is changing.
(That's what presses you back into your seat. Speed doesn't do that. When you're
cruising on a passenger airliner, you can easily be speeding along at 500 miles per
hour, but you can read a book, watch a movie, daydream, and drift off if you feel like
it. We don't feel speed. We feel changes in speed.)
One 'G' means that your speed is growing (or shrinking) by about 22 miles per hour
every second.
Fighter pilots train to experience high G-forces, and they wear special flight suits
to neutralize the forces on the body during high-G. If you or I go through 10 G's
without training or a special pressure suit, then the speed is growing by almost
220 miles per hour every second, and in that kind of situation, the blood drains
out of the brain and we pass out.
How does sound affect animals?
For communication. Higher or more advanced lifeforms need to be able to communicate with each other and other species for a wide range of activities - mating, feeding, territory, dominance. Sound is just one way of communicating. Creatures that don't use sound, like plants, haven't discovered any evolutionary benefit to using sound.
Can centrifugal force be balanced by coulomb force in an atom?
It can, but other forces (like the Strong Nuclear Force) also balance out the electromagnetic force. This gets into quantum mechanics, and the centrifugal force doesn't really apply a whole lot.
Before the shot, total momentum of the rifle/bullet system is zero. Momentum is conserved, so must total zero after the shot. Magnitude of momentum = m V (mass, speed); we'll take care of direction independently. Momentum of the rifle: m V = (3.8) x (2.4) = 9.12 kg-m/sec backwards. We need momentum of the bullet = 9.12 kg-m/sec forward m V = 9.12 ===> V = ( 9.12 / m ) = ( 9.12 / 0.013 ) = 701.54 m/s forward
The top speed is about mach 1.8 [1382.4 mph.]
The distance from New York to L.A. is about 3000 miles, which makes the best time about 2 1/2 hours.
They are not permitted to fly over about 650 mph. at air shows, but if they are over 10,000 feet, and not flying an airshow, they can go at top speed legally.
How fast is the thrust ssc in mph?
The ThrustSSC holds the current land speed record of 763.035 mph (1,227.986 km/h). It set this record on October 15, 1997, in Nevada's Black Rock Desert.
Why are sound waves known as pressure waves?
Because it is pressure that actually propagates through the medium. When air is the medium, air molecules are displaced outward and then back, in unison with the sound generating object. This 'wave' of pressure, much like a ripple on water, moves through the air outward from the source.
What is the biggest amount of energy ever released at once?
The largest amount of energy ever released at once was during the Tsar Bomba nuclear test conducted by the Soviet Union in 1961. It had an estimated yield of 50 megatons of TNT, making it the most powerful nuclear weapon ever detonated.
How fast are girraffes in mph?
Giraffes can run at speeds of up to 35-40 miles per hour for short bursts. However, they typically maintain a more leisurely pace of around 10 miles per hour when roaming or grazing.
How does increasing the surface area of a solid reactant affect the energy of molecular collisions?
Reactions depend on molecular collisions. If a solid reactant is a solid, grinding it into smaller particles will increase the surface area. The more surface area, the faster the molecular collisions, which in turn increases the rate of reaction.
How many feet will you travel going 50 miles per hour?
50 miles per hour is 50 * 5280 (feet per mile) per hour = 264000 feet per hour and then, depending on how long a time period you're interested in...you could just divide the 264000 feet per hour by 60 to find the distance in feet per minute...then divide that again by 60 to find the distance in feet per second.
A car will travel 264000 feet per hour at 50 mph.
264000 feet per hour / 60 minutes per hour = 4400 feet per minute
264000 feet per hour / 3600 seconds per hour = 73.33 feet per second
