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while unloading furniture, a worker slides a heavy box down the ramp on the rope. The ramp is inclined 60 degree to the horizontal and the worker applies upward forces of 450 N parallel tot the ramp to move the box without accerelation. If the coefficient of kinetic friction between the ramp and the box is 0.25, find the mass of the box.
A ball with a mass of 0.65 kg is dropped on a table. The initial height of the ball is 0.85 meters. Calculate the change in the momentum of the ball during its collision with the table
The Village of Harris issued $5,000,000 in 6 percent general obligation, taxsupported bonds on July 1, 2011, at 101. A fiscal agent is not used. Resources for principal and interest payments are to come from the General Fund. Interest payment date..
A 83.0 kg fullback is running at 3.86 m/s to the east and is stopped in 0.760 s by a head-on tackle by a tackler running due west. Calculate the impulse exerted on the fullback.
A CFL bulb that puts out as much light as a 60-W incandescent bulb might costs $10, compared to about $1 for the incandescent bulb. But CFL bulbs are expected to last (on average) 15,00 hours, compared to about 1000 hours for an incandescent bulb.
What is Terry's basis in her remaining common and preferred shares after the sale and when does her holding period for the preferred shares begin?
If 1 mol of oxygen is heated at a constant pressure of 1 atm from 10 C to 25 C. What is the change of volume of the gas in this process
Hubble time (1/H?) represents the age of a universe that has been expanding at a constant rate since the Big Bang. Assuming an H? value of 22 km/s/Mly and a constant rate of expansion, calculate the age of the universe in years. (Note: 1 year = 3.16 ..
A 0.420 kg ice puck, moving east with a speed of 3.12 m/s, has a head-on collision with a 0.890 kg puck initially at rest. Assuming a perfectly elastic collision, What is the speed of the heavier puck
The pulp density of flotation feed in a mill is averaging 37 % solids by weight. The ore has a moisture content of 6 % water. The concentrate grade is 25 % Cu, the tailings grade is 0.06 % Cu and the feed grade is 1.37 % Cu. The tailings leave the fl..
A golf ball of mass 0.047 kg is hit off the tee at a speed of 40.2 m/s. The golf club was in contact with the ball for 3.29E-3 s. Find the impulse imparted to the golf ball
A 87g arrow is fired from a bow whose string exerts an average force of 130N on the arrow over a distance of 80cm. Illustrate what is the speed of the arrow as it leaves the bow?
A converging lens has a focal lenght of 20cm. determine Where is the image located
Two boats start together and race across a 56-km-wide lake and back. Boat A goes across at 52 km/h and returns at 56 km/h. Boat B goes across at 36 km/h, and its crew, realizing how far behind it is getting, returns at 79 km/h. Turnaround times are n..
A hydrogen atom in its ground state absorbs a photon with an energy of 26 eV, What is the kinetic energy of the ejected electron
What is the stopping distance of the car, as measured from the point where the driver first notices the red light?
What is the minimum pressing force that must be used.
A cannonball is shot (from ground level) with an initial horizontal velocity of 40 m/s and an initial vertical velocity of 29 m/s, What is the initial speed of the cannonball
A golf ball of mass 50 g released from a height 1.5m above a concrete floor bounces back to a height of 1.0 m. What is the amount of energy lost during the impact
You are shining ultraviolet light on a gas of an unknown element. You know that an electron starts in a ground state with an energy of -17.30 eV. What is the energy of the first photon emitted
Calculate the cost of running the light bulb you used in lab at 12 volts for one year. Calculate the cost of a MacBook pro labtop to be left on for one year
A bungee jumper with mass 60.0kg jumps from a high bridge. after reaching his lowest point, estimate the unstretched length of the bungee cord assuming SHM
A wheel is rotating freely at angular speed 270 rev/min on a shaft whose rotational inertia is negligible. What fraction of the original rotational kinetic energy is lost
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