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A 4.0 m diameter merry-go-round is initially turning with a 4.4 s period. What is the speed of a child on the rim?
A football coach sits on a sled while two of his players build their strength by dragging the sled across the field with ropes. The friction force on the sled is 900 N and the angle between the two
A 2.6 kg wood block is launched up a wooden ramp that is inclined at a 32° angle. The block's initial speed is 10 m/s. (Use µk = 0.20 for the coefficient of kinetic friction for wood on w
On this surface the cars race in circles that are parallel to the ground, and the surface is at an angle = 20°. For a speed of 25 m/s, at what value of the distance d should a driver locate his
A 25.0 g piece of Aluminum (which has a molar heat capacity of 24.03J/Cmol) is heated to 82.4C and dropped into a calorimeter containing water (specific heat capacity of water is 4.18 J/gC) initial
How many grams of helium must be added to a balloon containing 8.00grams Helium gas to double its volume? Assumeno change in temperature or pressure.
At an accident scene on a level road, investigators measure a 2000kg car's skid mark to be 88 m long. The coefficient of friction was estimated to be .42. Use these date to determine the speed when
The pKa values for H2SeO3 at25oC are 2.64 and 8.27. Write the base-hydrolysis equilibrium equations forSeO32-(aq) and HSeO3-(aq) ions, and calculate the equilibrium constant values
The charges have different masses, but the same speed v. In the magnetic field, they move in semicircles with radii R and 2R, respectively. (a) What is the ratio of their masses?
Household vinegar is composed ofHC2H3O2 and water. It has adensity of 1.05 g / mL. Calculate the percent by mass of aceticacid in the household vinegar.The calculated molarity of the household
Having trouble understanding this lab question. we did a lab on acceleration due to gravity and we did 3 parts one part was dropping balls and timing its fall, another one was picketfence and the ot
The active ingredient in a bleach is sodium hypochlorite (approc 5.35m/v%). What is the molarity of this sodium hypochlorite (NaCL) solution?
A 2100 cm3 container holds 0.11 mol of helium gas at 350 degrees C. How much work must be done to compress the gas to 1100 cm3 at constant pressure? And how much work must be done to compress the gas
If the acceptable buffer range ofthe buffer solution is ± 0.10 pHunits, calculate how many moles of H3O+ can be neutralized by 250 mL of the buffer.
Two skaters,a man and a woman, are standing on ice. Neglect any friction between the skate blades and the ice. The woman pushes on the man with a certain force that is parallel to the ground.
We prepare a buffer by addind 0.200 mol hydrazine (N2H4) and 0.600 mol hydrazinium idodide (N2H5I) to 1.00 L of solution. What is the pH of this solution?
Will the rod still fit inside the washer? If so, how much smaller is the rod than the opening in the washer? If not, how much larger is the rod than the opening in the washer?
A 1600 kg car is moving westward with a speed of 20 m/s, and a 2800 kg truck is traveling east with a speed of 18 m/s. Find the velocity of the center of mass of the system. (Take east to be the pos
Three point masses of 1.9 kg each are located on the x axis. One is at the origin, another at x = 0.18 m, and another at x = 0.49 m. Find the center of mass of the system.
An electrical outlet for an electric stove provides a potential difference of 240 V, rms. Find the amplitude of the potential difference.
A diffraction grating that has 1000 slits / cm is parallel to the y-axis. The center is located on the x-axis at x = -5 m. A source of light of wavelength 650 nm is on the x-axis @ x = -125 m. How m
A vase with a mass of 0.800 kilograms falls from a height of 0.750 meters to a position of 0.500 meters above the floor. Ignoring frictional effects, the total mechanical energy at the 0.500 positio
The pH at one half the equivalence point in an acid-base titration was found to be 6.57, what is the value of Ka for this unknown acid?
An electron moving with a speed of 6.1x10^5 m/s in the positive x direction experiences zero magnetic force. When it moves in the positive y direction, it experiences a force of 1.9 x 10^-13 N that
0.50 mol CCl4 gas is introduced into a 10.0-Lflask. What fraction of the total volume of the flask is occupied by CCl4 molecules? (Value of Van der Waalsconstant b for CCl4 = 0.138 L/mo