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An elevator weighing 2500 N ascends at a constant speed of 8.0 m/s. How much power must the motor supply to do this
A boy flies a kite with the string at a 30 degree angle to the horizontal. The tension in the string is 4.5N. How much work does the string do on the boy
write the net ionic equation, a solution of potassium dichromate is added to an acidified solution of iron II chloride
The carbon isotope 14-C is used for carbon dating of archeological artifacts. What is the recoil speed of the nucleus
a 71 kg baseball lplayer jumps straight up to catch a line drive. If the 140 g ball is moving horizontally at 28 m/s, what is his speed immediately after stopping the ball
a 1.2-m-long steel rod with a diameter of 0.50 cm hangs vertically from the ceiling. By how much does the rod stretch
a frictionless pulley which can be modeled as a 0.80 solid cylinder with a 0.30 m radius has a rope going over it. What is the angular acceleration of the pulley
Moment of inertia Wheel If you lift the front wheel of a poorly maintained bicycle off the ground and then start it spinning at 0.72rev/s, what is the magnitude of the frictional torque
If a solution has a pH of 2.36 and you do a 20-fold dilution of it with ultrapure reagent-grade water, what will its pH be after you dilute it
A bicycle rim has a diameter of 0.65 m and a moment of inertia, What is the mass of the rim
An automobile emits 20 lbs of CO2 per gallon of gasoline burned. how many billions of lbs of CO2 are emitted every year
A Big Mac has 3,100,000 Joules of chemical energy, what is the cost of the electric energy equivalent to the energy in a Big Mac
Spattering does occur and some of the sample is lost onto the laboratory bench. Will the reported mole ratio of tin to oxygen be too high, too low, or unaffected. Explain.
Determine if the set is linearly dependent or linearly independent
The work function (i.e binding energy) W, of cesium of metal is 3.43 x 10^-19 J. Calculate the kinetic energy of the ejected electron if light of frequency 1.00 x 10^15 s-1 is used for irradiating t
In an oversight in the experiment Jamie did not add the 4-5 additional drops of 6M HNO3. As a result, will the reported number of moles of oxygen be too high or too low in the final product. Explain
A plane is pointed in the positive x direction and is flying with an speed of (200, 0, 0) m/s relative to the air. Find the velocity of the plane with respect to the ground
The oxygen sample burned in sodium to form sodium oxide, Na2O - write a balanced equation for the reaction.
The electric field has a constant value of 3.30 103 V/m and is directed downward. Find the potential at the following points
A gaseous compound containing carbon and hydrogen was analyzed and found to consist of 83.65% carbon by mass. What is the empirical formula of this compound
One particle has a mass of 3.00 10-3 kg and a charge of +8.40 µC. A second particle has a mass of 6.00 10-3 kg and the same charge. Find the initial separation between the particles
The formation of organic compounds by the reaction of Iron(II) sulfide and carbonic acid is described by the following chemical equation: 2 FeS + H2CO3 --> 2 FeO + 1/n (CHOH)n + 2 S
a 1200 kg car going 25m/s is brought to stop using its brakes. what is the change in temperature of the brakes and wheels
Calculate the wavelength (in picometers) associated with hydrogen atom moving at a speed of 3.13 x 10^3 cm/s
The melting point of the aspirin was found to be 110-115 celsius. Explain why the melting point was low and why the melting range was so wide