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What is the pressure the basketball exerts on the ground, if the contact area between the ball and the ground is a circle with radius 8 cm? Give answer in Pascals. Show work.
Explain what was surprising about the observations and important conslusions derived from blackbody radiation, the photoelectric effect, and the hydrogen spectrum.
The work function of a certain metal is 1.3*10^-18 J. Upon irradation with light of a given wavelength, electrons are ejected from the metal with a velocity of 3*10^6 m/s. what is the wavelength of
Cesium atoms are the largest naturally occurring atoms. The radius of a Cs atom is 2.62 angstroms. How many Cs atoms would have to be laid side by side to give a row of Cs atoms 1 inch long? (assume
A cell with .25 M internal concentration is placed into pure water. What is the pressure difference across the cell membrane?
Consider the reaction: H2(g) + CO2(g) -> H2O(g) + CO(g)0.80 mole of H2 and 0.80 mole of CO2 are placed in a 5dm3container at 1650 oC. At equilibrium, 0.25mole of CO was found in the
What is the Molar Mass of air if the the density is 1.00g L ^-1 at STP? Please show the work to solve this question.
At a certain point during the reaction, the [H2] = 0.15, [N2] = 0.10 and [NH3] = 0.020. Has the reaction reached equilibrium at this point, and if not, which direction does the reaction need to shif
A person swings a 0.521-kg tether ball tied to a 4.60-m rope in an approximately horizontal circle. If the maximum tension the rope can withstand before breaking is 10.2 N, what is the maximum angul
A 3.4 kg object moving at 5.4 m/s in the positive direction of an x axis has a one-dimensional elastic collision with an object of mass M, initially at rest. After the collision the object of mass M
A slightly bruised apple will rot four times faster at 20 degrees Celsius than in a refrigerated at 0 degrees Celsius. Compute the activation energy for the rotting process, please show work.
What is the definition of the joule in terms of the basic SI units?
A point mass rotates in a circle with l = 1. Calculate the magnitude of its angular momentum and the possible projections of the angular momentum on an arbitrary axis.
A 69.5g sample of the compound X3O4 contains 19.2g of oxygen atoms. What is the molar mass of element x
The osmotic pressure of 8.05x10 to the negative third M solutions of Cacl2 and urea at 25 degrees celcius are o.487 and 0.197 atm respectively. Calculate the van hoff factor of Cacl2a
If a car increases its speed from 14.2 mph to 42.6 mph, by what factor does the kinetic energy of the car increase? Enter your answer to three significant figures, Show work.
A compound that has a molecular ion peak in its mass spectrum at mass 94 and shows prominent peaks in its IR spectrum at 3600-3200 and 1600 cm-1. Can we say the compound has a molecular mass of 94?
Magnesium metal reacts with hydrochloric acid to form aqueous magnesium chloride and hydrogen gas. An excess of magnesium is reacted with 20.0 mL of 3.00M and all of the hydrogen is collected in a b
The alpha-particle bombardment of fluorine-19 generates sodium-22 and neutrons. Write the nuclear equation, including the intermediate compounds.
Two long, parallel wires separated by 3.50 cm carry currents in opposite directions. The current in one wire is 1.60 A, and the current in the other is 3.45 A. Is the force attractive or repulsive?
An ice skater with mass of 50 kg pushes off from the wall of an ice rink. She begins at rest, and after letting go of the wall she is moving away from the wall with a speed of 3 m/s. Assume that th
An airplane starting from rest takes 25s and 500m of runway at constant acceleration to leave the ground. What is its velocity when it becomes airborne?
White light containing wavelengths from 400 nm to 750 nm falls on a grating with 6000 lines/cm. How wide is the first-order spectrum on a screen 2.70 m away?
If the cable lifts upward on it with a force of 10900 N, what is the resultant force acting on the elevator?
A circular loop of conducting wire measuring 12cm in diameter is placed into a .60-T magnetic field. What is the magnetic flux through the loop: