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Calculate momentum of a particle having mass 28kg and velocity 7.8ms?
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∙ 15y ago
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∙ 15y ago
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Why do you need momentum?
Momentum is defined as the "Mass in Motion". It is a Vector quantity. It depends on two variables (Object Mass and Velocity) . Its direction is same as objects velocity direction. In physics momentum is required to specify the motion of the object . If two bodies of same masses having different velocities have different momentum , in a similar way bodies of different masses having same velocity have different momentum. So , in order to describe the motion of object clearly one of the tool in classical mechanics is momentum
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.
When did Louis de broglie discover electron waves?
Wavelength is inversely proportional to momentum (of a particle such as an electron - or any having mass) was proposed by LDB for his doctoral thesis in 1924
When a body has constnat velocity what is the acceleration?
The acceleration is zero for a body having constant velocity.
Is A steep slope on a displacement vs. time graph indicates a large velocity.?
Not necessarily. The slope could be steep but negative, and since negative numbers are less than positive numbers, no. But in both cases, the magnitude of the velocity (speed) is great. Also, at each point in the displacement vs. time graph, you can only get instantaneous velocity. A curve on the graph will indicate an acceleration. The next antiderivative of acceleration is jerk. According to the Heisenberg uncertainty principle, the more certain you are of a particle's position OR velocity, the less certain you can be of the other property. On the displacement vs. time graph, either the particle is at a certain displacement and the velocity unknown, or the velocity between two points is known, but the displacement is unknown. That is, the velocity can be known between two points, but the particle resides somewhere between the two points at that time. The exact position is uncertain. Schroedinger had a cat. He put it in a box, and having no way to tell if the cat was alive or dead, it must be assumed to be both, simultaneously. But also because it is either alive or dead, and not both at once, yet also not partially one or the other, it must be assumed to also be neither at once. So Schroedinger's cat was both alive and dead, though it was neither. By corollary, the particle whose trajectory is described by the displacement vs. time graph has no velocity and has velocity at the same time.
Calculate momentum of a particle having mass 5 kg and velocity 5 ms?
25 kg m/s
Why do you need momentum?
Momentum is defined as the "Mass in Motion". It is a Vector quantity. It depends on two variables (Object Mass and Velocity) . Its direction is same as objects velocity direction. In physics momentum is required to specify the motion of the object . If two bodies of same masses having different velocities have different momentum , in a similar way bodies of different masses having same velocity have different momentum. So , in order to describe the motion of object clearly one of the tool in classical mechanics is momentum
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.)
When does a car have momentum?
Momentum = Mass x Velocity. (p=m*v)The mass of an object made of matter can not be zero.If the object (car) is moving, then the velocity will be non-zero, and the object will have non-zero momentum.So, if you are driving or rolling the car, it has momentum.If it is parked, then it will have 0 velocity (with respect to the earth), and thus will have 0 momentum.So, when the car is moving, it has net momentum. When it is parked it has zero momentum. I then just becomes a mater of semantics whether having zero momentum is equivalent to not having momentum, or if it is actually a valid value for momentum or state of momentum.
Tennis ball have momentum?
Momentum is calculated by taking the product of mass times velocity. Thus, a moving tennis ball would have a nonzero momentum. However, since a tennis ball has a relatively small mass, it would need to have a high velocity in order to have a large value for its momentum. Since velocity is a vector (having both a magnitude and a direction), momentum is also a vector. When a tennis player hits a tennis ball with his racket, he imparts a force onto the tennis ball, which changes the direction of its momentum to return it over the net. (The value for this change in momentum is called impulse, which is equal to the product of the force applied and the time for which it is applied.)
Can abody have energy without having momentum?
yes. a body can have energy without momentum also. consider a body at a height 'h' m above the ground level , potential energy contained is = mgh but , as the velocity is 0 we can consider that the momentum of the body is 0
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.
Does a particle moving in a straight line have acceleration?
A particle moving in a straight line may or may not have acceleration. Acceleration is adifferent phenomenon altogether. the rate of change of velocity is acceleration, a particle can move in a straight line with a constant velocity thus having no acceleration & it can also move with increasing or decreasing velocities thereby accelerating or deaccelerating.
When did Louis de broglie discover electron waves?
Wavelength is inversely proportional to momentum (of a particle such as an electron - or any having mass) was proposed by LDB for his doctoral thesis in 1924
Why does a cruise ship docking slowly and a speed boat going at maximum speed both have a large momentum?
the momentum of a body is reached using the equation MOMENTUM=MASS*VELOCITY , in this case, the cruise has a very large mass but a very low speed while the speedboat has a very high speed while having a comparitively low mass.
How is it possible that negatively charged beta particles are emitted from a positively charged nucleus during nuclear decay?
An electron (negative particle) and an electron neutrino (neutral particle) are released when a neutron (neutral particle) changes into a proton(positive particle) therefore in order for neutral charge to create a positive particle it also has to create a negative particle to balance it out.As a significant amount of binding energy is released, the electron is ejected at high velocity as beta radiation while the much more massive nucleus containing the newly created proton recoils with very low velocity. The neutrino having almost no mass is ejected at almost the speed of light, but is nearly impossible to detect except by implication from the "missing momentum".Basically beta particles are ejected from the nucleus by conservation of momentum before and after the decay event.
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
