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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
Equal and opposite forces acting on the same object are called?
Two equal forces (equal in magnitude and direction) result in simply double each individual force. However, if the forces are acting opposite to each other they will cancel each other out and they cause a resultant force of zero. This means the object is in linear equilibrium and is either moving at a constant speed or is stationary.
The higher the value of the coefficient of friction the resistance to sliding is what?
The larger the value of μ (aka Mu, the coefficient of friction, the greater the frictional force on an object. For instance, steel on nonlubricated steel has a μ of 0.58 while steel on lubricated steel has a μ of 0.06.
The coefficient of static friction is always larger because it takes more initial force to move an object that is at rest.
How is Net Force realated to interference?
The notion of net force is a force that acts upon an object that effects its motion but has no direct impact on the object, for instance gravity on a ball throw through the air.
This is mentioned in Newtons 2nd law of motion. In this example the net force of gravity interfers with the ball thrown by pulling it back towards the earth. Otherwise without gravity and othe net forces such as wind resistance, the ball would continue on it path forever until a direct force acted upon it, i.e. hit a wall.
What describes the amount of force divided by its cross section?
The force on an object divided by its cross section is called stress or pressure or pounds per square inch.
What always happens when an energy transformation occurs?
The total amount of energy remains the same.
What is impulse momentum equation?
It is F*t = m*dV or F*t = m*v - m*u
where:
F is the force, acting for time t,
m is the mass of the object, dV it the change in its velocity
u and v are the velocities of the object before and after the impulse.
Which wave will have the highest wave height?
For water waves, the tsunamis reach the greatest heights
What is the frequency of sound?
The frequency of a sound wave is the number of oscillations passing a given point in 1 second. One oscillation per second = one Hz (Hertz). The frequency of a sound wave determines the pitch of the sound. The higher the frequency (more osculations: the higher the pitch. The normal human can detect sounds within the frequency range of 20 -- 20,000 Hz.
Related Information:
Sound is the result of a series of oscillating, longitudinal, mechanical waves of pressure (vibrations) traveling through a transmission medium. Sound waves can not travel in or through a vacuum. They require a transmission medium (some material that is at least slightly compressible) in order to travel. Without a transmission medium, there is no sound. That's the reason space is so quiet.
Sound waves can be transmitted through a: gas (like air), liquid (such as water), or solid (like a steel rod or a a drumstick).
Jntu btech ccc first year mechanical all subjects question papers?
btech(ccc) mech previous question papers
It would take too long to explain all the math, so here are some answers:
If you use acceleration due to gravity = -10m/s^2:
height = 25.3125m
If you use acceleration due to gravity = -9.81m/s^2:
height = 25.1640625m
What is the net force when acceleration is zero?
This is a good question. We can relate force and acceleration using the equation F=ma, where m is mass. If the net force, F is zero, that means that either the mass or the acceleration has to be zero so that the equation is true. All objects have mass, so m can't be zero. That means that a has to equal zero in all cases. It is also important to note that acceleration is how fast an object is speeding up or slowing down. An object may be moving and have zero acceleration, if it's velocity is constant. Hope this helps.
What can be said about a situation in which work done is negative?
the formula F.S cos angle is used (the dot product)
so if angle is 0,cos angle=1 hence work done is positive and maximum
if angle is 90 so cos 90 is 0 hence work done is minimum
if work done is negative the angle is 180
The work done by friction is always negative (opposite the force)
Since work is force x displacement, a negative value for work could mean that the displacent was negative
What is true in a static equilibrium if the value of total force is equal to zero?
In equilibrium, the TOTAL or not the NET force will always be zero. Because according to newton's law, if there is a net force, the object will experience acceleration.
How do you pick the right fusible link?
Fuses are based upon the size of the wire of the circuit that it is to protect. The wire is sized by the amperage of the connected amperage load of the circuit.
What is a liquid changing into a gas such as water changing into water vapor?
Evaporation or vaporization.
What is the physical significance of the thermal diffusivity and How is it defined and what?
Thermal diffusivity signifies the rate of heat transfer into the solid. If it is higher then less time is required for the heat to penetrate into the solid. it is th property of a solid. If we know the mass density,specific heat and thermal conductivity coefficient then we can determine its thermal diffusivity.
Velocity (relative and absolute), medium of transmission, ...
