0
What is the formula for calculating kinetic energy without the given velocity?
Wiki User
∙ 13y ago
example 51 = 1/2 5 v2
so 51 / (1/2 5) = your squared
51 / (2.5) = 20.4
square root of 20.4 is your velocity
hope this helps, can say if it's 100% correct but i tried to work this out myself and haven't got it wrong yet after a few trials
try it on this one, simply remove the allready know 18 (v)...
your answer should equal what the v2 equals, then square root that number for velocityEk = (1/2 80) (182) = 12960
Wiki User
∙ 13y ago
Add your answer:
Earn +20 pts
Can potential energy ever be less than kinetic energy?
The answer to both of your questions lies in the different nature of both quantities, momentum and kinetic energy. Momentum is a vector, kinetic energy is a scalar. This means that momentum has a magnitude and a direction, while kinetic energy just has a magnitude. Consider the following system: 2 balls with equal mass are rolling with the same speed to each other. Magnitude of their velocities is the same, but the directions of their velocities are opposed. What can we say about the total momentum of this system of two balls? The total momentum is the sum of the momentum of each ball. Since masses are equal, magnitudes of velocities are equal, but direction of motion is opposed, the total momentum of the system of two balls equals zero. Conclusion: the system has zero momentum. What can we say about the total kinetic energy of this system? Since the kinetic energy does not take into account the direction of the motion, and since both balls are moving, the kinetic energy of the system will be different from zero and equals to the scalar sum of the kinetic energies of both balls. Conclusion: we have a system with zero momentum, but non-zero kinetic energy. Assume now that we lower the magnitude of the velocity of one of the balls, but keep the direction of motion. The result is that we lower the total kinetic energy of the system, since one of the balls has less kinetic energy than before. When we look to the total momentum of the new system, we observe that the system has gained netto momentum. The momentum of the first ball does not longer neutralize the momentum of the second ball, since the magnitudes of both velocities are not longer equal. Conclusion: the second system has less kinetic energy than the first, but has more momentum. If we go back from system 2 to system 1 we have an example of having more kinetic energy, but less momentum. I hope this answers your question Kjell
What portion of the total kinetic energy of a rolling object is translational energy?
If an object is rolling without slipping, then its kinetic energy can be expressed as the sum of the translational kinetic energy of its center of mass plus the rotational kinetic energy about the center of mass. The angular velocity is of course related to the linear velocity of the center of mass, so the energy can be expressed in terms of either of them as the problem dictates, such as in the rolling of an object down an incline. Note that the moment of inertia used must be the moment of inertia about the center of mass. If it is known about some other axis, then theparallel axis theorem may be used to obtain the needed moment of inertia.
Is velocity of electrons increase by increasing voltage?
Depends on what is between the potential difference (ie, the voltage). If it's an evaculated tube, and the electrons are travelling between the anode and the cathode without much interference, then then a higher voltage will mean that the electrons arrive with more kinetic energy -- ie, increased velocity. However, if there's a wire between the two voltages, then the drift velocity of the electrons (which is pretty slow to begin with) does not increase, but only the number of electrons that are drifting.
What is Motion without acceleration?
Such and object is said to be in equilibrium. No acceleration and no force.
Why is velocity a vector quantity?
Velocity refers to both speed and direction. A vector refers to both magnitude (the speed in this case) and a direction. Speed without reference to a direction is a scalar, a magnitude without direction.
Why do you need momentum with kinetic energy?
Momentum is the product of mass and velocity. Kinetic Energy is the product of mass and velocity squared. As you can see, since Kinetic Energy is derived from mass and velocity, and Momentum is derived from mass and velocity, you cannot have one without the other.
A disc weighing 2 kg rolls without slipping over a horizontal plane with a velocity 4 ms1 Find the kinetic energy of the disc?
A disc weighing 2 kg rolls without slipping over a horizontal plane with a velocity 4 ms1 Find the kinetic energy of the disc?
Can somthing have momentum without having energy?
momentum = mass * velocity kinetic energy = 1/2 mass * velocity^2 If an object has non-zero momentum, it has non-zero velocity. It thus has kinetic energy, at least. It most likely has other forms of energy as well (potential, thermal, etc.)
What are the two values of kinetic energy?
That can't be answered without the question but kinetic energy (KE) can be calculated like this: KE = 0.5mv2, where m is mass (kg) and v is velocity (m/s)
What is the formula for calculating Velocity?
Mathematically, terminal velocity-without considering buoyancy effects-is given bywhereVt = terminal velocity,m = mass of the falling object,g = acceleration due to gravity,Cd = drag coefficient,ρ = density of the fluid through which the object is falling, andA = projected area of the object.Anand Kumar GuptaResearch ScholarCSIR Laboratory
How can a trucks kinetic energy can be increased without increasing its speed?
Drive alongside it in another vehicle and then move stuff onto the truck. This will increase the mass of the [whole] truck and so increase its KE. This is dangerous so do not try it!
Can a body have kinetic energy without having momentum?
Momentum = (mass) x (speed) Kinetic Energy = 1/2 (mass) x (speed)2 It looks like the only way a body can have zero momentum is to have either zero mass or else zero speed, and if either of those is zero, then that makes the KE also zero as well, too. So the answer to the question is apparently: no.
Can anybody have momentum without energy?
No, if you are dealing with kinetic energy. momentum is the relationship between mass and velocity... equation is p=mv p = momentum m = mass v = velocity energy is the relationship of one half of the mass and velocity squared... equation is ke = .5mv2 ke = kinetic energy m = mass v = velocity If the equations don't make sense then thing about it logically. Momentum is the concept of an object moving with a certain speed that has a certain mass. Kinetic energy also consists of things moving that have a certain mass and velocity. Kinetic energy is just a different thing so it is calculated different. Potential energy is the other type of energy. This is the energy of an object that is NOT moving. So if dealing with potential energy the energy is not in motion and therefore does not have momentum.
Which is greater static or kinetic energy?
You can not make a decisive answer without knowing the MASS of the Object and its relative POSITION and Velocity in its Reference Frame. They could be Equal, or either one greater than the other.
Can potential energy ever be less than kinetic energy?
The answer to both of your questions lies in the different nature of both quantities, momentum and kinetic energy. Momentum is a vector, kinetic energy is a scalar. This means that momentum has a magnitude and a direction, while kinetic energy just has a magnitude. Consider the following system: 2 balls with equal mass are rolling with the same speed to each other. Magnitude of their velocities is the same, but the directions of their velocities are opposed. What can we say about the total momentum of this system of two balls? The total momentum is the sum of the momentum of each ball. Since masses are equal, magnitudes of velocities are equal, but direction of motion is opposed, the total momentum of the system of two balls equals zero. Conclusion: the system has zero momentum. What can we say about the total kinetic energy of this system? Since the kinetic energy does not take into account the direction of the motion, and since both balls are moving, the kinetic energy of the system will be different from zero and equals to the scalar sum of the kinetic energies of both balls. Conclusion: we have a system with zero momentum, but non-zero kinetic energy. Assume now that we lower the magnitude of the velocity of one of the balls, but keep the direction of motion. The result is that we lower the total kinetic energy of the system, since one of the balls has less kinetic energy than before. When we look to the total momentum of the new system, we observe that the system has gained netto momentum. The momentum of the first ball does not longer neutralize the momentum of the second ball, since the magnitudes of both velocities are not longer equal. Conclusion: the second system has less kinetic energy than the first, but has more momentum. If we go back from system 2 to system 1 we have an example of having more kinetic energy, but less momentum. I hope this answers your question Kjell
Is there a formula for time without needing final velocity?
Yes. d = ut + 1/2at2 Where d is the distance travelled u is the initial velocity and a is the accelearation Solve the quadratic, 1/2at2 + ut - d = 0 for time t.
How do you find a final velocity without distance but given time?
Without distance, you have to know time, initial velocity, and acceleration, in order to find final velocity.
