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What is the apparent weight of a 75 kg astronaut 4200km from the center of the earths moon in a space vehicle (a) moving at constant velocity and (b) accelerating toward the moon at 2.9m/ssw
How many lead atoms are in a cube of lead that has a volume of 1.82cm3 if the density of lead is 11.3 g/cm3?
A 140g air-track glider is attached to a spring. The glider is pushed in 12.0cm and released. A student with a stopwatch finds that 9.00 oscillations take 10.0s. What is the spring constant?
A volume of 50.0 of aqueous potassium hydroxide (KOH) was titrated against a standard solution of sulfuric acid (H2SO4). What was the molarity of the solution if 13.2 of 1.50 M H2SO4 was needed.
A 2200-kg pile driver is used to drive a steel beam into the ground. The pile driver falls 7.00 m before coming into contact with the top of the beam, and it drives the beam 14.0 cm farther into the
What is the angular speed of rotation of the Earth? (2) An old 33 1/3 rpm record player starts from rest and reaches operating speed in 2.00 seconds. Through what angle did it turn in those 2.00 se
Derive an equation for the radius r of the circular path that the electrons follow in terms of the magnetic field B, the electrons' velocity v, charge e, and mass m. You may assume that the electro
The value of the molar absorbtivity is 7.36x103M-1cm-1 for K2CrO4 at the wavelength. What is the concentration of this chromate solution?
A weight lifter lifts a set of weights a vertical distance of 1.56m. If A constant net force of 379N Is exerted on the weights, what's the net work done on the weights?
Light with a frequency of 7.34 × 1014 Hz lies in the violet region of the visible spectrum. What is the wavelength of this frequency of light? Answer in units of nm
An aluminum rod is 18.5 cm long at 20 degrees celcius and has a mass of 350g. If 10,000J of energy is added to the rod by heat, what is the change in length of the rod?
If the blocks move determine the magnitude of the tension in the string. If the blocks do not move determine the sum of the magnitude of the forces of friction acting on the blocks. Show all work.
By adding Hg to the tube he increase the pressure on the trapped air to 2.64atm. assuming constant temperature, what is the new volume of air?
If we place the origin in the nest and extend the +x-axis to the release point, what was the bird's average velocity for the return flight? (m/s). What was the bird's average velocity in {rm m/s} fo
Three uniform thin rods, each of length L = 35 cm, form an inverted U. The vertical rods each have a mass of 18 g; the horizontal rod has a mass of 35 g. What are (a) the x coordinate and (b) the y
The temperature of the solution went up to 29degrees C. If calorimeter constant is 11 cal/deg C, find delta H for the solution of one mole of NaOH in H2O.
The CaC2O4-H2O precipitate is not completely air-dried when its mass is determined. Will the reported mass of the limiting reactant in the original salt mixture be reported too high or too low? Explai
A chair of weight 105 lies atop a horizontal floor; the floor is not frictionless. You push on the chair with a force of = 35.0 directed at an angle of 43.0 below the horizontal and the chair slides
Iron has a density of 7.87 g/cm3, and the mass of an iron atom is 9.27 × 10-26 kg. If the atoms are spherical and tightly packed, (a) what is the volume of an iron atom and (b) what is the di
Kc = 3.59 at 900 °C. For each of the following measured concentrations determine whether the reaction is at equilibrium. If not at equilibrium, in which direction will the reaction proceed to ge
An empty freight car of mass M starts from rest under an applied force P. At the same time, sand begins to run into the car at steady rate b from a hopper at rest along the track. Find the speed whe
A spring with 55 hangs vertically next to a ruler. The end of the spring is next to the 20- mark on the ruler.If a 3.0- mass is now attached to the end of the spring, where will the end of the sprin
How many carbon atoms are in the empirical formula? How many hydrogen atoms are in the empirical formula? How many oxygen atoms are in the empirical formula?
If 2.0 g of salicylic acid are reacted with 5.0 mL of acetic anhydride in the presence of an acid catalyst, what is the theoretical yield of aspirin in grams? (just enter a number, no units)
A stone with a mass of 0.900kg is attached to one end of a string 0.900 m long. The string will break if its tension exceeds 60.0 N . The stone is whirled in a horizontal circle on a frictionless ta