Rotational Inertia Problem
A uniform solid sphere of mass 5 kg and radius of 30 cm is rotating about an axis through its center at a rate of 180 rev/min. Find the kinetic energy of the sphere. The rotational inertia of the sphere is 2/d MR^2.
Energy
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Rotational Motion: Rod released on smooth horizontal plane
A thin rod of length h and mass M is held vertically with its lower end resting on a frictionless horizontal surface. The rod is then released to fall freely. Determine the speed of its center of mass just before it hits the horizontal surface. Use h, M, and g for length, mass, and gravitational acceleration respectively. (b)
3 Physics Problems
(See attached files for full problem description with units and diagrams) --- A package of mass is released from rest at a warehouse loading dock and slides down a 3.0-m-high frictionless chute to a waiting truck. Unfortunately, the truck driver went on a break without having removed the previous package, of mass 2 , from
Motion in a vertical circle: conservation of energy
A pendulum consists of a string of length L and a bob of mass M. The string is brought to a horizontal position and given the minimum initial speed enabling a pendulum to make a full turn in the vertical plane. a) what is the maximum kinetic energy K of the bob? b) what is the tension in the string when the kinetic energy is
Find compression of spring at bottom of incline
A block of mass m starts from rest at a height h and slides down a frictionless plane inclined at theta with the horizontal. The block strikes a spring of force constant k. Find the compression of the spring when the block is momentarily at rest.
Calculating the Power of a Pump
Question: A pump is required to lift 800 kg of water (about 210 gallons) per minute from a well 14.0m deep and eject it with a speed of 18.0 m/s. a) How much work is done per minute in lifting the water? b) How much in giving the water the kinetic energy it has when ejected? c) What must be the power outpu
How to calculate spring constant force
If an object with a mass of xkg on the end of a spring with a mass of ykg, is pulled 0.2 m away from equilibrium on a horizontal table and released where it achieves a max velocity of Zm/s at X=0, how do you calculate the spring constant?
On a frictionless horizontal air table: Speed of the puck, change in kinetic energy
See attached file for full problem description with units. On a frictionless horizontal air table, puck A (with mass 0.369 ) is moving toward puck B (with mass 0.249 ), which is initially at rest. After the collision, puck A has velocity 0.116 to the left, and puck B has velocity 0.645 to the right. a.) What was the
Collision in One Dimension
(See attached file for full problem description with diagrams and units) On a frictionless horizontal air table, puck A (with mass 0.369 ) is moving toward puck B (with mass 0.249 ), which is initially at rest. After the collision, puck A has velocity 0.116 to the left, and puck B has velocity 0.645 to the right. a)
Total Kinetic Energy difference to rotational kinetic energy
A thin stick of length L = 1.6 m is denser at one end than at the other: Its mass density is = (0.40 kg/m) - (0.03 kg/m^2)x, where x measures the distance from the heavier end of the stick. The stick rotates with period T = 1 s about an axis perpendicular to the stick through the heavy end. Determine the rotational kinetic ener
Determine the Rotational Kinetic Energy
A thin stick of length L = 1.6 m is denser at one end than at the other: Its mass density is = (0.40 kg/m) - (0.03 kg/m2)x, where x measures the distance from the heavier end of the stick. The stick rotates with period T = 1 s about an axis perpendicular to the stick through the heavy end. Determine the rotational kinetic energ
CN in molecular clouds
Cold, interstellar, molecular clouds have been seen to contain the cynogen molecule, CN, whose first rotational excited states have an energy of 4.7*10^-4 eV above the ground state. There are actually 3 such excited states, all with the same energy. In 1941, studies of these molecular clouds, using the absorption of starlight pa
A pair of bumper cars in an amusement park ride collide...
A pair of bumper cars in an amusement park ride collide elastically as one approaches the other directly from the rear. (see attachment for diagram) One has a mass of m1 = 464 kg and the other m2 = 560 kg, owing to differences in passenger mass. If the lighter one approaches at v1 = 4.32 m/s and the other is moving at v2 =
Conservation of momentum and energy: A 0.420 kg ice puck, moving east with a speed of 3.04 m/s...
A 0.420 kg ice puck, moving east with a speed of 3.04 m/s, has a head-on collision with a 0.930 kg puck initially at rest. Assuming a perfectly elastic collision, what is the speed of the lighter puck? Use east as the positive axis.
Mass Sliding Without Friction
A 0.50-kg mass is hooked to two springs as shown in the diagram below. The mass slides without friction, and the spring constant of ONE spring is 15.0 N/m. The mass is given a push, so that its velocity at the equilibrium point (in the middle) is 0.16 m/s. (A) With what frequency does the mass oscillate back and forth? (B)
Kinetic energy and potential energy - a dropped stone
An object initially at rest is droped from a height of 20m. What is the speed of the object when it hits the ground? assume g=9.8m/s^2
Drop height to achieve known deflection in a beam
A .5m long beam with 29N-m stiffness is attached to a 45kg weight. The beam is inclined 30 degrees from vertical. Assume the beam has no mass, assume the 45kg weight is "sliding" down a vertical pole of infinite stiffness and zero friction. The mass is dropped and the end of the beam deflects .095m when it contacts the ground.
Physics problem
A potter's wheel -- a thick stone disk of radius 0.500 m and mass 100 kg -- is freely rotating at 50.0 rev/min. The potter can stop the wheel in 6.00 s by pressing a wet rag against the rim and exerting a radially inward force of 65.0 N. Find the effective coefficient of kinetic friction between the wheel and the rag.
Working with Kinetic friction
I have calculated an answer (D), but am not totally sure about its accuracy. Please could you work out the correct answer so I can compare. (See attached file for full problem description)
An electron with a speed 5.00x10^8 cm/s enters an electric field of magnitude 1.00x10^3 N/C, traveling along a field line in the direction that retards its motion. (a) how far will the electron travel in the field before stopping momentarily, and (b) how much time will have elapsed? (c) If the region containing the electric field is .08m long, what fraction of the electron's initial kinetic energy will be lost in that region?
An electron with a speed 5.00x10^8 cm/s enters an electric field of magnitude 1.00x10^3 N/C, traveling along a field line in the direction that retards its motion. (a) how far will the electron travel in the field before stopping momentarily, and (b) how much time will have elapsed? (c) If the region containing the electric fiel
Estimate the Change in the Potential Energy
Estimate, based on the force at the initial and final points, the change in the Potential Energy of a system as the second charge moves to the point (.02475 m,0,0), assuming a stationary charge of -65.07 microC located at the origin, if the second charge of -100.2 microC is initially located at the point (.045 m,0,0).
Energy Levels of Electron
Determine the lowest four energy levels and wave functions of an electron trapped in an infinitely deep potential well of width 2.0nm. What is the longest wavelength of light emitted by this system?
Planck's constant - Energy
If Planck's constant were much, much larger how would this affect our everyday lives?
What is the flux density of magnetic path?
Assume that the energy stored in the air gap is 1.5 J. What is the flux density of magnetic path? ( Hint: Convert to proper units) 1) 0.007 Wb/m^2 2) 0.350 Wb/m^2 3) 1.70 Wb/m^2 4) 4.24 Wb/m^2 (Please see the attachment for the diagram)
Calculate How Much Energy There is in a String
How much energy is there in a string of length 55 meters whose mass density is 7.3g/m, when the string is carrying a traveling wave with amplitude .95 meters and frequecny 77Hz, if the wave velocity is 50 m/s?
Potential and Kinetic energy of an oscillator
A block of mass m = 0.65 kg is fastened to a spring with k = 65 N/m. The block is pulled a distance x = 11 cm from its equilibrium position at x = 0 on a frictionless surface and released from rest at t = 0. v= 1.1 m/s^2 Calculate the potential and kinetic energy of the oscillator when the block is at x = 0.
Change in Potential Energy
A particle with a charge of 5.5 x 10^-8 C is fixed at the origin. A particle with a charge of -2.3 x 10^-8 is moved from x = 3.5 cm on the x axis to y = 4.3 cm on the y axis. The change in potential energy of the two-particle system is equal to what?
Parallel plates and charge mass
Please show all work and show all equations used and diagrams, etc. etc. so I understand completely please. 1) In separate experiments 4 different particles each start from far away with the same speed and impinge directly on a gold nucleus. the masses and charges of the particles are: 2) Rank the particles according to t
Potential Difference: Particle Change, Lightning Discharge Etc.
Please show all work and show all equations used and diagrams. 1) If 500J of work are required to carry a 40C charge from one point to another the potential difference between these two points is: 3) The potential difference between two points is 100V. If a particle with a charge of 2C is transported from one of these poi
Understanding the Human Ear
The radius of a typical human eardrum is about 4.0 mm. Find the energy per second received by an eardrum when it listens to sound that is (a) at the threshold of hearing and (b) at the threshold of pain.