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A car travels up a hill at a constant speed of 38.1 km/hr and returns down the hill at a constant speed of 56.6 km/hr. Calculate the average speed of the trip.
How much work is used to raise A to height h? What happens to the kinetic energy of B if its speed is doubled?
Two loudspeakers are placed next to each other and driven by the same source at a frequency of 570 Hz. A listener is in front of the speakers and on on the line separating them, thus creating a con
A compound of molecular weight 280 g/mol a concentration of 15.0 micrograms per ml absorbs 65 percent of radiation at a certain wavelength in a 2 cm cell. Calculate it molar absorptivity at a wavel
Compute the mass of the confined air on the first and the second inner cylinder using the formula m=pv where p is the density of the air
If he uses the combustion of natural gas (which is exothermic) to heat the water, how much natural gas will he need to burn? Natural gas produces 49.3 kJ of heat per gram.
Physics two skaters with masses of 65 kg and 45 kg, respectively stand 8.0 m apart each holding one end of a rope.
The density of toluene at the temperature of the experiment is 0.8035 g/ml. Calculate the density of the solid in g/cm^3.
A 58.0 kg person jumps from rest off a 12.0 m high tower straight down into the water. Neglect air resistance during the descent. She comes to rest 3.00 m under the surface of the water. Determine t
A person wearing a safety belt can withstand an acceleration of -3.0 x 10^2 m/s^2. How thick should barriers be to safely stop a car that hits a barrier at 117 km/h?
Suggest a second method suitable for determine the free calcium ions on a similar sample of bood.in each cases suggest if the sample needs pretreatment or if it could be measured directly.
A projectile is fired from the surface of the Earth with a speed of 200 meters per second at an angle of 30 degress above the horizantal. If the ground is level, what is the maximum height reached b
The equation for the reaction is S + O2= SO2 how much sulfur(in tons) present in the original materials would result in that quantity of SO2?
The force of the wind on the sails of a sailboat is 410 N north. The water exerts a force of 240 N east. If the boat (including crew) has a mass of 330 kg, what are the magnitude and direction of it
Find the maximum height that the rocket reaches (neglecting air resistance). Express the maximum height in terms of a, t1, and/or g. Note that in this problem, g is a positive number equal to the ma
A car travels at 58.0 miles per hour and gets 10.0 kilometers per liter of gasoline. How many gallons of gasoline are needed for a 1.00 hour trip?
The other end is attaced to a 3 kg disk moving in uniform circular motion on the table, which stretches the spring by 1 cm. Note: Friction is negligibe. What is the work done on the disk by the spri
What volume of sodium thiosulfate and water are needed to make 250 mL an approximate 0.10 M solution starting with 1.0 M sodium thiosulfate solution.
While in Europe, if you drive 105km per day, how much money would you spend on gas in one week if gas costs 1.10 euros per liter and your car's gas mileage is 22.0mi/gal ? Assume that 1euro=1.26doll
How many grams of sodium succinate (MW=140 g/mol) and disodium succinate (MW=162 g/mol) must be added to 1L of water to produce a solution with pH=6.0 and a total solute concentration of 50 mM. The
Calculate the partition coefficient for the compound between hexane and water (Kphexane/water). Your answer should reflect the proper number of significant figures.
What was the difference in kilometers between the two altitudes?& ; How low did the probe go?
A copper refinery produces a copper ingot weighing 121 lb. If the copper is drawn into wire whose diameter is 8.00 mm, how many feet of copper can be obtained from the ingot?
What is the normal boiling point (in C) of a solution prepared by dissolving 1.50 g of aspirin (acetylsalicylic acid, C9H8O4) in 75.00 g of chloroform (CHCl3)? The normal boiling point of chloroform
A piece of metal with a mass of 168 g is placed in a 50 mL graduated cylinder. The water level rises from 20. mL to 38 mL. What is the density of the metal?