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What is the potencial energy of an elevator with a mass of 8.00x 10^2 kg at the top of manila hotel, 3.80 m. above the street level?
When 5.00 g of X is titrated with NaOH, it is found that X has two acidic hydrogens that react with NaOH and that 54.9 mL of 1.00 MNaOH is required to completely neutralize the sample. What is the m
A 34.0 g sample of nitrogen gas reacts with an excess of hydrogen gas to give an actual yield of 4.75 g NH3. What is the percent yield for this reaction? Reaction: N2(g) + 3 H2(g) ? 2 NH3(g).
An object is found to move with an acceleration of magnitude 8 m/s2 when it is subjected to a force of magnitude 222 N. Find the mass of the object.
How much SO3 can be produced from 96.0 g of O2 and excess sulfur if the yield is 84.5%?
An athlete at the gym holds a 1.2 kg steel ball in his hand. His arm is 64 cm long and has a mass of 4.0 kg. What is the magnitude of the torque about his shoulder if he holds his arm straight, but
Using Heisenberg's uncertainty principle, calculate the uncertainty in the position of: a 1.50-mg mosquito moving at a speed of 1.40 m/s if the speed is known to within a + or - 0.01 m/s.
The vertical component of this force is 128 newtons, while the horizontal component is 145 newtons. Calculate the magnitude of F.
When the galvanometer in a wheatstone bridge circuit shows no deflection, why are the voltages across opposite branches on each side of the galvanometer necessarily equal?
A thin stick of mass M = 4.3 kg and length L = 1.4 m is hinged at the top. A piece of clay, mass m = 0.5 kg and velocity V = 0.8 m/s hits the stick a distance x = 0.75 m from the hinge and sticks t
2,3,6-tri-O-methyl-D-glucose, 2,4-di-O-methyl-D-glucose and 2,3,4,6-tetra-O-methyl-D-glucose. The ratio of these sugars was 20:1:1. What is the structure of the polysaccharide?
How much heat is released when 40.0 g of steam at 250.0oC cools and condenses to water at 30.0oC?
A grocery cart with a mass of 13 kg is being pushed at a constant speed up a flat 16 degree ramp by a force Fp which acts at an angle of 17 degrees below the horizontal. Find the work done by the: (
In a beaker100 mL of 0.10 M HCl is added to 50 mL of 0.40 M KOH. Calculate the final concentration of OH- in solution after the reaction goes to completion.
A swimmer slides freely from rest from the top of a water slide and reaches the bottom with a horizontal speed. He hits the water 4.6 meters from the slide 0.8 second later. Find the length of the s
A chilled steel rod at 2.00 is placed in the water. If the final temperature of the system is 21.4 , what is the mass of the steel bar?
A reaction at 2.35 atm produces 18.4 L of a gas and evolves 84.1 kJ of heat (exothermic). Calculate the change in internal energy of the system (in kJ)
A 250 gram sample of a metal is warmed from 60 °C to 85 °C when 1000 cal are added. What is the specific heat constant for the metal?
Iron reacts with oxygen in the air to produce rust, Fe2O3, according to the reaction shown below. 4 Fe + 3 O2 → 2 Fe2O3 How many moles of rust can be formed if 1.8 moles of iron are present?
Calculate the difference in pressure between methane and an ideal gas under these conditions. The van der Waals constants for methane are a =2.300 L^2 x atm/mol ^2 and b=0.0430 L/mol.
Having landed on a newly discovered planet, an astronaut sets up a simple pendulum of length 1.17 m and finds that it makes 577 complete oscillations in 1590 s. The amplitude of the oscillations is
The driver of an 2000 kg car traveling at 20.0 m/s slams on the brakes, locking the wheels on the dry pavement. The coefficient of kinetic friction between rubber and dry concrete is typically 0.65
A 2.1 by 10 to the power of 3 kg car starts from rest at the top of a driveway that is sloped at an angle of 20.0 with the horizontal. An average friction force of 4.0 by 10 to the power of 3 N impe
Consider the following covalent bond radii. What is the approximate length of the CN bond in OC(NH2)2 (urea) using the table values?
Find the magnitude and direction of the resultant force, given the vertical component of a force vector is 580 N and the horizontal component is 200 N.