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After struggling to remove a refrigerator (mass = 100 kg.), you finally apply enough force to get it moving. What is the minimum force needed to keep it moving with a constant velocity. The coeffici
Polonium-218 is an alpha emitter with a half-life of 3.0 minutes. If a sample contains 55 mg of Po-218 (atomic mass = 218.008965 amu), how many alpha emissions would occur in 25.0 minutes?
A car is moving with velocity of 20 m/s when the brakes are applied and the wheels lock (stop spinning). The car then slides to a stop in 40 m. Find the coefficient of kinetic friction between the t
Find ΔH for the freezing of water at -8.00 degrees celcius. The specific heat capacity of ice is 2.04 J/g. C and its heat of fusion is -332 J/g. What is the ΔE, q and w for t
Furthermore, he claims that he can do this by launching the ball at the relatively low angle of 25° above the horizontal. To evaluate his claim, determine the speed with which this quarterback m
Show that the function in part (a) can be written as f(x + vt) + g(x - vt), and determine the functional forms for f and g, assuming that f(x) = g(x) = 0 for x = 0.
Calculate the work done in joules if the gas expands (a) against a vacuum, (b) against a constant pressure of0.80 atm, and (c) against a constant pressure of 3.7 atm.
A car is traveling at 25 m/s when the driver spots a large pothole in the road a distance of 30 m. ahead. She immediately applies her brakes. If her acceleration is negative at -27 m/s^2, does she m
Gold can be plated out of solution according to the equationAu3+(aq) + 3e- ---> Au(s) What mass of gold in grams will be plated by the flow of 5.5Aof current for 25 minutes?
First Question: Sketch the direction of the net electric field due to the two charges at point A (with tail at A)
A person travels by car from one city to another with different constant speeds between pairs of cities. She drives for 45.0 min at 55.0 km/h, 13.0 min at 95.0 km/h and 55.0 min at 55.0 km/h, and sp
Determine the molecular formula for ibuprofen, a common headache remedy. Analysis ofibuprofen yields a molae mass of 206 g/mol and a percentcomposition of 75.7% C, 8.80% H and 15.5% O
Two small plastic spheres are given positive electrical charges. When they are a distance of 14.2 cm apart, the repulsive force between them has a magnitude of 0.210 N. What is the charge on each sp
When these forces begin to act, the velocity of the duck is 0.11 m/s in a direction due east. Find the magnitude and direction (relative to due east) of the displacement that the duck undergoes in 2
On the left side of the tube, the depth of the oil is 2.40 . The density of the water is 1.00 * 10^3kg/m3, and the density of the vegetable oil is 920kg/m3. Find difference in height between the two s
Determine the carburizing time necessary to achieve a carbonconcentration of 0.45 wt% at a position 2 mm into an iron-carbonalloy that initially contains 0.20 wt% C. The surface concentrationis to
A ball is thrown vertically upward with a speed of +13.0 m/s. How long does it take to reach its highest point?
A sheet of steel 1.5 mm thick has nitrogen atmospheres on bothsides at 1200oC and is permitted to achieve asteady-state diffusion condition. the diffusion coefficient fornitrogen in steel at this te
Calculate the fraction of atom sites that are vacant for lead atits melting temperature of 327oC (600K). Assume anenergy for vacancy formation of 0.55 eV/atom.
The plate separation of a charged capacitor is 0.1031 m. A proton and an electron are released from rest at the midpoint between the plates. Ignore the attraction between the two particles, and dete
A boat is traveling with a velocity of 5 km/hr upstream. The river is flowing at a velocity of 2km/hr downstream. What is the velocity of the boat compared to the riverbank?
How would you change the experimental procedure of the synthesis & purification of acetylferrocene to synthesize & purifydiacetylferrocene?
A rocket is launched at an angle of 55.0° above the horizontal with an initial speed of 101 m/s. The rocket moves for 3.00 s along its initial line of motion with an acceleration of 30.0 m/s2.
If potassium carbonate is used to selectively precipitateone of the cations while leaving the other cation in solution,which cation will precipitate first?
A tunnel under a river is 2km long. At what frequencies can the air in the tunnel resonate? Explain whether it would be a good to make a rule against blowing your car horn when you are in the tunnel