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The analysis of a compound showed that it contained 0.903 mol of C, 0.0430 mol of H, 0.602 mol of O, and 0.301 mol of N. How many Nitrogen atoms are there in the empirical formula for this compound?
A loudspeaker of mass 22.0 {rm kg} is suspended a distance of h = 2.20 {rm m} below the ceiling by two cables that make equal angles with the ceiling. Each cable has a length of l = 3.10 {rm m}.
A baby grand piano with a mass of 285 kg hangs from two cables. The angle between the horizontal and the left cable is 27 degrees. The angle between the horizontal and the right cable is 45 degrees
A diving board of length 3.00 {rm m} is supported at a point 1.00 {rm m} from the end, and a diver weighing 550 {rm N} stands at the free end . The diving board is of uniform cross section and weig
World-class sprinters can accelerate out of the starting blocks with an acceleration that is nearly horizontal and has magnitude 15m/s^2. How much horizontal force F must a sprinter of mass 62.0 kg
Consider a homogeneous gallium arsenide semiconductor at T = 300 K with Nd = 1016 cm-3 and Na = 0. Calculate the thermal-equilibrium values of electron and hole concentrations.
An 88g arrow is fired from a bow whose stringht exerts an average force of 110N on the arrow over a distance of 78cm. What is the speed of the arrow as it leaves the bow?
A tennis player hits a ball 2.0 m above the ground. The ball leaves his racket with a speed of 16.0 m/s at an angle 5.5 degrees above the horizontal. The horizontal distance to the net is 7.0 m and
A humanitarian aid package is dropped from a plane flying horizontally 500 m above the ground with a speed 100 m/s. What is the speed of the package at the time of impact? (Calculate the total speed
Jane's mass is 20 kg. She starts from rest at the top of a 5 m tall slide and reaches a velocity of 5 m/s at the bottom of the slide. What is the change in thermal energy of the Lily/earth/slide sy
A peg is located a distance h directly below the point of attachment of the cord. If h = 0.70 L, what will be the speed of the ball when it reaches the top of its circular path about the peg? (Use t
Megan's mass is 26 kg. She starts from rest at the top of a 4.8 m tall slide and reaches a velocity of 5.1 m/s at the bottom of the slide. What is the change in thermal energy of the Megan/earth/sl
Two small spheres spaced 40.0 cm apart have an equal charge. How many excess electrongs must be present on each sphere if the magnitude of the force of repulsion between them is 5.37x 10^-21 newton
A force stretches a wire by 0.60mm. A third wire of the same material has the same length and twice the diameter as the first. How far will it be stretched by the same force?
A converging lens (f = 13.0 cm) is held 7.30 cm in front of a newspaper, the print size of which has a height of 1.90 mm. Find (a) the image distance (in cm) and (b) the height (in mm) of the magni
Two ants race across a table 76 cm long. One travels at 4.6 cm/s and the other at 3 cm/s. When the first one crosses the finish line, how far behind is the second one?
The total electric flux from a cubical box 28cm on a side is 1.45*10^3 Nm^2/C. What charge is enclosed by the box?
One student dilutes 10 mL stock solution to a final volume of 20 mL. S/he dilutes 10 mL stock solution to a final volume of 40 mL. S/he dilutes 10 mL stock solution to a final volume of 60 mL. Does
A car is traveling at 24 m/s when the driver spots a large pothole in the road a distance 35 m ahead. She immediately applies her brakes. If her acceleration is -4.3 m/s2, does she manage to stop b
If the orientation of the spacecraft is to be changed by 30.0°, for what time interval should the gyroscope be operated?
Naturally occurring element X exists in three isotopic forms: X-28 (27.977 amu, 92.23% abundance), X-29 (28.976 amu, 4.67% abundance), and X-30 (29.974 amu, 3.10% abundance). Calculate the atomic we
An airplane flying horizontally 3600 ft above the ground at 120mi/hh, drops relief aid on the ground. Determine the angle between the vertical and the line joining the plane and the target at the i
When the tablet dissolves in water, it "fizzes" as the bicarbonate reacts with the citric acid and the vitamin C. What mass of the NaHCO3 reacts with the vitamin C?
A flat circular mirror of radius 0.190 m is lying on the floor. Centered above the mirror, at a height of 0.770 m, is a light source. Calculate the diameter of the bright circular spot formed on th
You find a compound composed only of element "X" and hydrogen, and know that it is 79.89% element X by mass. Each molecule has 3.00 times as many H atoms as X atoms. What is element X?