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The best pH for a swimming pool is between 7.2 and 7.6. If your swimming pool has a pH of 8.0, then do you need to add an acidic or a basic substance to bring the pH into the proper range?
Explain why a bag of charcoal briquettes contains the following warning: Do not use for indoor heating or cooking unless ventilation is provided for exhausting fumes to the outside.
An Alka-Seltzer tablet contains solid citric acid and sodium hydrogen carbonate. What happens, and why, when the tablet is dropped into water?
You overhear someone comment that a lot of "cat cracking" takes place in oil refineries. Should you call the Society for the Prevention of Cruelty to Animals?
How does hydrogen bonding affect large molecules like proteins? What shapes do proteins take because of this effect?
The mass of a space shuttle is approximately 2.0x10^6 kg. Throughout lift-off, the net force on the shuttle is 1.0x10^7 newtons directed upward. What is the speed of the shuttle 10 seconds after liftoff.
A flight attendant pulls her 72.0 N flight bag a distance of 282 m along a level airport floor at a constant speed. The force she exerts is 33.0 N at an angle of 52.0° above the horizontal.
A grinding wheel of radius 0.35 m rotating on a frictionless axle is brought to rest by applying a constant friction force tangential to its rim. The constant torque produced by this force is 75N · m. Find the magnitude of the friction force.
A baseball player hits a ball at 49.2m/s at an angle of 29.0 degrees above the horizontal. The outfield bleachers are 145 m away from the home plate.
what speed does the rock have as it strikes the ground?
What tension in Newtons should a 50cm length of string support in order to whirl an attached 2000g stone in a circular path at 5 m/s.
Two charges charges of -2.1 micro-coulombs and a charge of +2.1 micro-coulombs are placed on the corners of an equilateral triangle where the length of a side is 44 cm as shown in the sketch below. What is the magnitude of the total electric field..
A torque of 60 Nm producing a counterclockwise rotation is applied to the wheel about its axle. A frictional torque of 10 nm acts at the axle.If the wheel is observed to accelerate at the rate of 2rad/s2 under the influence of these torques, what i..
The wheel of the car has a radius of 0.340 m. The engine of the car applies a torque of 282 N•m to this wheel, that does not slip against the road surface. Since the wheel does not slip, the road must be applying the force of static friction to the w..
How far below the top of the well is the surface of the water. If you ignored the travel time for the sound, what would have been the calculated depth.
An electric field of 220000 N/C points due west at a certain spot. What is the magnitude of the force that acts on a charge of -10C at the spot.
A thin soap film (n = 1.302) suspended in air has a uniform thickness. When white light strikes the film at normal incidence, violet light (&lambdav = 412 nm) is constructively reflected. At what angle of incidence will green light (&lambdag = 562..
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