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From a point 1000 feet closer to the mountain along the plain, they find that the angle of elevation is 29 ^\circ. How high (in feet) is the mountain?
A 2.50 kg mass is attached to a light cord that is wrapped around a pulley of radius 3.45 cm, which turns with negligible friction. The mass falls at a constant acceleration of 3.85 m/s2. Find the m
A 2.50 gram sample of an unknown base is dissolved in water and titrated with 0.220 M HCl to the equivalence point. It takes 36.44 mL of acid to complete this titration.
A heat lamp emits infrared radiation whose rms electric field is Erms = 3500 N/C. (a) What is the average intensity of the radiation?
If the amine is valuable then slightly more than 1equivalent of a 3 degree (tertiary) amine, such as triethylamine orpyridine is added.
Ignore any friction between the skateboard and the sidewalk. What is the skateboard's velocity relative to the sidewalk at this instant? Be sure to include the correct algebraic sign with your answe
At a certain instant before the carts collide, the first cart's velocity is +3.9 m/s, and the second cart's velocity is -1.1 m/s. (a) What is the total momentum of the system of the two carts at thi
When an acid chloride or acid anhydride is used to preparean amide two equivalents of amide are required. Write reactions that can explain this.
The slower planet's orbital period is 7.25 years. (a) What is the mass of the star? (b) What is the orbital period of the faster planet, in years?
A basketball player tries to make a half-court jump shot, releasing the ball at the height of the basket. Assuming that the ball is launched at 51(degrees), 14.0 m from the basket, what speed must t
What is the correct equillibrium constant expression for the following reaction? Fe2O3 (s) + 3H2(g) in equillibrium 2Fe (s)+3H2O(g)
A camera in the control tower is taping the plane's flight. The speed that the camera must turn to keep up is ____ radians per second.
A satellite is in a circular orbit about the earth (M = 5.98 x 1024 kg). The period of the satellite is 7.40 x 104 s. What is the speed at which the satellite travels?
In a Diels Alder reaction - - Synthesis of1,2,3,4-tetraphenylnaphthalene; using anthranilic acid and isoamylnitrite as reactants, how could you increase the percent yield?
Two strings of length 0.78 m hang from the same point on the ceiling. At the end of each string there is a small ball of mass 0.024 kg, electrically charged. The charges repel each other so that the
When you mix bleach + NaI, what color will you see and in what layer? Silver Nitrate + NaI gives you a milky precipitate that later disappears, what color is formed from these two elements added toge
What are the minimum dimensions for the rear-view mirror if the driver is to be able to see the entire width and height of the rear window in the mirror without moving her head?
What is domain of function T? Find adjusted gross income g as function of federal income tax T.what are the domain and the range of this function?
You want to load 15 μg of protein in 10 μL into one ofthe 12% polyacrylamide gel well. The protein needs to be in 1Xbuffer and in a total volume of 0.100 ml. You are given a 4.5 mg/mlprotein s
The tungsten filament of one of your round bulbs has a radius of about 0.015 mm. Calculate the electric field required to drive 0.15 ampheres of current through the glowing bulb and show that it is
How much ice (in grams) would have to melt to lower the temperature of 352 mL of water from 26 C to 6 C?(Assume the density of water is 1.0 g/mL.)
Write a system of linear equations to represent the situation. Then use Cramer's rule to find the number of $10 bills.
The mass of a star is 1.49 x 1031 kg and it performs one rotation in 26.1 days. Find its new period (in /days) if the diameter suddenly shrinks to 0.59 times its present size. Assume a uniform mass
The four suquential sides of a quadrilateral have lengths 4.5 cm, 7.9 cm, 9.4cm, and 12.9. The angle between the two sides is 117 degrees. What is the area of this quadrilateral?
Two planes leave the same airport at the same time. One flies at at 20 degrees east of north at 500 miles per hour. How far apart are the planes after 2 hours?