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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.
A 1.20 102 kg crate is being pushed across a horizontal floor by a force P that makes an angle of 30.0° below the horizontal. The coefficient of kinetic friction is 0.350. What should be the mag
what is the linear attenuation coefficient for this material? b) What is the half thickness? c) what is the mean-free-path length for 1.25-MeV photons in this material?
A 240-kg crate is pushed horizontally with a force of 685 N. If the coefficient of friction is 0.20, calculate the acceleration of the crate.
A pitcher throws a baseball horizontally from the mound to home plate. The ball falls 1.105 m (3.62 ft) by the time it reaches home plate 18.3 m (60 ft) away. How fast was the pitcher's pitch?
where observed when C60 molecules were passed through single and multiple slits, respectively. What is the wavelength of a C60 molecule (mass: 1.20×10-24 kg) moving with a velocity
An infinitely long line of charge has a linear charge density of 5.00×10-12 C/m. A proton is at distance 19.0 cm from the line and is moving directly toward the line with speed 2000 m/s. How
A 99.8mL sample of a solution that is 12.0% KI by mass(d=1.093g/mL) is added to 96.7mL of another solution that 14.0%Pb(NO3)2 by mass (d=1.134g/mL). How many grams of PbI2 should form?