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The gas phase reaction 2A → P in which the product, P is formed when two A molecules collide. What does it mean when it said "increase by a factor of 9"? Where is 9 comes from?
Our Sun rotates about the center of the Galaxy (MG 4. 1041 kg) at a distance of about 3. 104 light-years (1 ly = 3. 108 multiplied by 3.15 107 s/y multiplied by 1 y). What is the period of our orbi
How much force must you exert to keep the pole motionless in a horizontal position?
A penny of mass 3.1 g rests on a small 20 g block supported by a spinning disk. The coefficients of friction between the block and the disk are 0.75 (static) and 0.64 (kinetic) while those for the
When 125 g of copper reacts with 34 g of oxygen gas to form copper (II) oxide, no copper or oxygen is left over. How much copper (II) oxide is produced?
When synthesizing epoxy resin, amines are used as the curing agent. Amines react rather quickly with epoxy groups. How might you slow the reaction down? How might you speed it up?
An 854-kg (1887 lb) dragster, starting from rest, attains a speed of 27.1 m/s (60.7 mph) in 0.59 s. Find the average acceleration of the dragster during this time interval.
The loaded cab of an elevator has a mass of 3.0 103 kg and moves 218 m up the shaft in 23 s at constant speed. At what average rate does the force from the cable do work on the cab?
Phenylacetic acid (C6H5CH2COOH, simplified here to HPAc) builds up in the blood of persons with phenylketonuria, an inherited disorder that, if untreated causes mental retardation and death. A study
You have some metal shot (small spheres about 5 mm in diameter), and you want to identify the metal. What metal is in the spheres? (Assume that the spheres are all the same and consist of pure metal.)
A pitcher throws a baseball at 41.0 m/s. If the ball thrown horizontally at this speed, how much will it drop by the time it reaches the catcher who is 17.0 m away from the point of release?
What is the net upward force on an airplane wing of area 20m^2 if the speed of flow is 320 m/s across the top of the wing and 305 m/s across the bottom of the wing?
1.00 L each of separate solutions of 0.3 M KCl, 0.1 M AgClO4 and 0.1 M Pb(NO3)2 are mixed into one container. Give the formulas of the precipitate formed and give the formulas of the spectator ions.
A boy and a girl are riding on a merry go round which is turning at constant rate. The boy is near the outer edge, and the girl is closer to the center. Who has the greater tangential acceleration?
To explain why he seems to hang in the air, calculate the ratio of the time he is above ymax/2 moving up to the time it takes him to go from the floor to that height. You may ignore air resistance.
An air pump draws 150 liters of air (25 oC, 1 atm) every minute and compresses it to 8 atm. How much heat will need to be dissipated per minute to avoid buildup of the heat from compression?
It hits the ground after an interval of 4.10 s. What is the potential difference between the starting point and the top point of the trajectory?
A rescue plane drops a package of emergency rations to a stranded party of explorers. The plane is traveling horizontally at 150.0 m/s at a height of 70.0 m above the ground. What horizontal distanc
How much volume will CO2 occupy when the can is opened and how much work will be done by the content of the can?
Two stationary positive point charges, charge 1 of magnitude 3.45 and charge 2 of magnitude 1.90 , are separated by a distance of 51.0 . An electron is released from rest at the point midway between
A laser beam in air is incident upon ethanol at an angle of incidence of 37 degrees. What is the angle of refraction?
A Ferris wheel rotates at an angular velocity of 4.5×10-2 . At your friend Seth is at the very top of the ride. What is Seth's angular position at = 3.2 measured counterclockwise from the top?
The error in the experiment of L is the error inherent in the use of any scale (half the distance between adjacent markings, doubled because of two ends to the distance measured). What type of erro
If 79.2 grams of magnesium nitride are mixed with excess water, then how many moles of NH3 are produced?
Each mole of hemoglobin binds 4 mol of oxygen. What is the enthalpy of reaction per mole of oxygen bound? The heat capacity of the solution the solution may be assumed to be 4.18 J/K/cm3.