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A dead tree is initially stationary and there is a 30.0-degree angle between the tree and the vertical, How fast is the top of the tree moving (in m/s) just before it hits the ground
what fraction of the day's energy does walking one hour represent? How many kilograms of water would have to be evaporated if this were the only means of heat loss. (The heat of vaporization of wate
To what volume should you dilute 45mL of a 12M stock HNO3 solution to obtain a 0.121M HNO3 solution
Imagine that a hypothetical life form is discovered on our moon and transported to Earth. calculate the heat lost by each body from the vaporization of sweat
Determine the annual interest rate for your loan using information from a local bank or an internet ad. Reduce this rate by 2%.This is r, but expressed as a decimal.
A 1000-kilogram race car is traveling at 60 m/s around a curved section of track that has a radius of 300 m. What is the centripetal force that acts on the car
Acid halides and Acid anhydrides can also be used to make esters - show how ethyl ethanoate can be made from a) and acid halide and b) an acid anhydride
A 30-meter steel tape is correct at a temperature of 20.0(C). The distance between two points, What is the true distance between the points
A space probe is launched from Earth, headed for deep space. At a distance of 15,000 miles from the Earth's center, What is the size of the force when it is at 30,000 miles from the Earth's center
At noon on a clear day, sunlight reaches the earth\'s surface at Madison, Wisconsin, with an average power of approximately 2.00 kJ·s-1·m-2. If the sunlight consists of photons with an
How many grams of IBr were initially put into the vessel and determine the equilibrium constant - How many grams of IBr were initially put into the vessel?
The classroom temperature is 20 C. The relative humidity is 60%. What is the total humidity (kg of H2O vapor) in the room
A 1 kg ball is attached to a 2 m long piece of very light string and suspended in such a way that it can freely swing and it passes just above the ground. completely describe the motion of the two m
How many moles of sodium chloride are present in the original solution. How many moles of ammonia are present originally
A trolley that moves along a horizontal beam is acted upon by two forces as shown. What is the corresponding magnitude of the resultant
What is the mass (in grams) of the precipitate when 7.1 g of iron(III) chloride reacts in solution with excess sodium phosphate
On planet X, the absolute pressure at a depth of 2.30 m below the surface of a liquid nitrogen lake is 5.50×10^5 N/m^2. What is the atmospheric pressure on planet
A sample containing NaCl, Na2SO4, and NaNO3 gives the following elemental analysis: Na: 35.315%, O: 36.55%; Cl: 15.17%. Calculate the mass percent of each compound in the sample.
Jack and Jill exercise in a 25.0-m-long swimming pool. Find the average velocity and average speed of each swimmer
The required ionic concentrations are Na+=2.45M; K+=.0086M; Mg2+ =.0517M; Ca2+=.0109M, HCO3-=.0025M, CL-=2.48M; SO4 2-=.0486M
The general molecular formula for alkanes is CnH2n+2. What is the general molecular formula for cycloalkanes with two rings
For the gas phase decomposition of C2H5Cl, a graph of ln t versus 1 / T produced a straight line with a slope of 2.98 × 104 K. What is the activation energy for this reaction
A 70.0 cm thick layer of oil floats on a 120 cm thick layer of water. What is the pressure at the bottom of the water
What is the hydronium ion concentration of a 0.500 M acetic acid solution with Ka = 1.8 x 10-5. The equation for the dissociation of acetic acid is: CH3CO2H(aq) + H2O(l) <---> H3O+(aq) + CH3CO
A 75 g piece of ice at an initially unknown temperature is placed into a glass of 350 g of water sitting at room temperature, What is the specific heat capacity of the unknown metal