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A 10 mL pipet is calibrated by dispensing exactly 10 mL of distilled water into a flask and then weighing the water to determine how much was actually delivered. The pipet can be read to 2 decimal p
For two shells fired at the same speed which statement about the horizontal distance traveled is correct?
You are helping your friend prepare for her next skate board exhibition. For her program, she plans to take a running start and then jump onto her heavy-duty 15-lb stationary skateboard.
A solution contains a mixture of pentane and hexane at room temperature. the solution has a vapor pressure of 258 torr. pure pentane has a vapor pressure of 425 torr and pure hexane 151 torr at room
The terminal voltage of the battery is observed to be one-half the emf of the battery. How many bulbs are connected?
The absorptivity often used in rapid determinations of protein concentration is the E^1%, based on aromatic amino acid absorbance at 280nm in a 1 cm pathlength. The E^1% employed for a mixture of pr
Two identical blocks made of extremely hard metal collide with equal and opposite velocities. Is such a collision closer to being completely inelastic?
A 0.0188 g sample of a non-electrolyte isolated from throat lozenges was dissolved in enough water to make 10.0 mL of solution at 25 degrees celsius. The osmotic pressure of the resulting solution w
A 24 kg block slides with an initial speed of 14 m/s up a ramp inclined at an angle of 25o with the horizontal. The coefficient of kinetic friction between the block and the ramp is 0.6. Use energy
Catching a wave, a 71 kg surfer starts with a speed of 1.3 m/s, drops through a height of 1.95 m, and ends with a speed of 8.2 m/s. How much nonconservative work was done on the surfer?
Two identifcal blocks with equal but opposite velocities collide and stick together. We know that they must be at rest after the collision. Why? What happened to their intial kinetic energy?
Two point charges are separated by 10.0 cm and have charges of +2.00 μC and -2.00 μC, respectively. Calculate the electric field at a point midway between the two charges. And calculate the el
The driving force for fluid flow is the pressure difference, and a pump operates by raising the pressure of a fluid (by converting the mechanical shaft work to flow energy). A gasoline pump is measu
The asteroid collides perfectly inelastically with the planet at its equator while traveling tangentially to the surface of the planet in the same direction as the velocity of the contact point on t
A series RC circuit has a time constant of 1.0 s. The battery has a voltage of 50 V and the maximum current just after closing the switch is 500 mA. The capacitor is initially uncharged. Calculate t
A student weighs 0.12311 g of Na2CO3 and dissolves it in 50.0 mL of water in an Erlenmeyer flask. How many moles of HCl will be needed to reach the end point of titration?
Two cylindrical resistors are made of the same material. The resistors, with resistance R1 and R2, have different radii, r1 and r2, and different lengths, L1 and L2. What is the relative values (r1/
If the size of the positive charge value is tripled for both of two point charges, to maintain the same mutual force between them what would be the ratio of old to new distance between the two point
The iron in a 1.0000g rock sample is dissolved, reduced to Fe+2 and titrated with dichromate. If the titration requires 12.40ml of 0.5000 Normal dichromate, what is the percentage of Fe2O3 in the s
A scientist wants to make a solution of tribasic sodium phosphate, Na3PO4, for a laboratory experiment. How many grams of Na3PO4 will be needed to produce 500 mL of a solution that has a concentrat
A semiconductor laser in a CD player has an output wavelength of 780 nm and a power level of 0.10 mW. How many photons strike the CD surface during the playing of a CD 69 minutes in length?
The analysis of 4.017g of a strontium iodide hydrate revealed it contained 3.041g of anhydrous strontium iodide and thus 0.976g of water . Determine the formula of the hydrate.
Two forces FA and FB are applied to an object whose mass is 5.00 kg. The larger force is FA. When both forces point due east, the object's acceleration has a magnitude of 1.30 m/s2.
Calculate the total pressure in the container at the conclusion of the reaction if the final temperature is 90oC. The equilibrium vapor pressure of water at 90°C is 526 mmHg.
An electron is released from rest at the point midway between the two charges, and it moves along the line connecting the two charges. What is the speed (v final) of the electron when it is 10.0 cm