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The sudden opening of the epiglottis and vocal cords releases this air explosively. Just prior to this release, what is the approximate pressure of the gas inside the lungs?
A 12.0 g bullet is fired horizontally into a 102 g wooden block that is initially at rest on a frictionless horizontal surface and connected to a spring having spring constant 154 N/m. The bullet b
When the molten liquid solidified, the melting point was re-determined and found to be 131oC. Give a possible explanation for this discrepancy.
A force is applied to a 3 kg mass and produces 5.4 m/s2 acceleration. What acceleration would be produced by the same force applied to a 6.9 kg mass?
How many milliliters of a stock solution of 6.20 M HNO3 would you have to use to prepare 0.200L of 0.530 M HNO3?
What is the acceleration experienced by the tip of the 1.5 cm long sweep second hand on your wrist watch? In M/s^2
The equilibrium constant of this reaction is K = 1.0, and that the initial pressure of A was 1 atm, what change in the gas pressure in the reaction chamber do you expect?
A camel sets out to cross the desert, which is 21.3 km wide in the north-south direction. The camel walks at the uniform speed 4.7 km/hr along a straight line in the direction 47.7? north of East (o
What is the acceleration of a falling crate (mass including parachute 132 kg) when the upward force or air resistance is one-fourth its weight
A 78 L sample of dry air is cooled from 138°C to -33°C while the pressure is maintained at 2.85 atm. What is the final volume?
Suzie (of mass 60 kg) is roller-blading down the sidewalk going 18 miles per hour. She notices a group of workers down the walkway who have unexpectedly blocked her path, and she makes a quick stop
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?