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Three resistors all have resistance 30 W . What are the largest and smallest equivalent resistances that can be created with these three resistors?
The girl pushes the boy hard, sending him backward with a velocity 2.10 m/s toward the west. Ignore friction. How much potential energy in the girl's body is converted into mechanical energy of the
Suppose you have separated molecules from a mixture by column chromatography, and there is a color overlap.What do you think might be the cause and how could the procedure be modified to get a bette
A 0.405-µF capacitor is connected across the terminals of a variable frequency oscillator. (a) What is the frequency when the reactance is 5.88 kO?
(a) Find the common speed the two gliders have when the spring is at maximum compression. (b) Find the maximum spring compression distance.
Calculate the amount of ammonium chloride that must be dissolved in 0.75L of water to produce a solution of pH 5.25 Please show all your work and explain.
Air is 78.0% Nitrogen molecules and 21% Oxygen molecules. What is Nitrogen partial pressure at atmospheric pressure of 1 atm?Assume ideal behavior.
The object is pulled down an additional 15.5 cm and released from rest to oscillate without friction. What is its position x at a moment 84.4 s later? Find the distance traveled by the vibrating obj
A variable capacitor with negligible resistance is connected to an ac voltage source. By what factor does the current in the circuit increase if the capacitance is increased by a factor of 6.0 and t
What is the pH of a buffer solution containing 35.0 g of NH4Cl dissolved in 1.00 L of 1.00 NH3?Kb of NH3 = 1.8 x 10-5 How many moles of HCl are required to change the pH of this solution by
The astronaut is strapped into a seat 4.00 m from the axis. What is the astronaut's tangential acceleration during the first 40.0 s?
Determine the concentration of the species present at equilibrium if 0.10 mol of ethylenediamine is dissolved in 2.00 L of asolution that contains 6.5 x 10-3 M Ni2+.Kf of [Ni(en)3]2+
The 4.0 V battery is then disconnected and replaced with a 5.0 V battery, with the positive and negative terminals connected in the same manner as before. How much additional charge flows to the pos
A charged belt, 35 cm wide, travels at 40 m/s between a source of charge and a sphere. The belt carries charge into the sphere at a rate corresponding to 100 µA. Compute the surface charge den
Two oppositely charged parallel plates with an electric field of 80 V/m have potential difference of 40 V. A tiny sphere of mass 50 mg with 2120 excess electrons is placed in the field and sits on t
A block of iron absorbs 5,400 joules of heat. If the temperature increases from 22 C to 32 C, what is the mass of the block? The specific heat of iron is 450 J/kg degrees celsius.
What mass (ingrams) of water would he need to perspire in order to maintain his original temperature? (It takes 44.0 kJ to vaporize 1 mole ofwater.)
A real battery has emf ε= 50.0 V. When it is connected to a 20.0-Ω resistor, the current is 2.45 A. What are the internal resistance of the battery and the potential differnce between
A wire of length L and resistance R is cut in half, and the two halves are connected in parallel. What is the resistance of the parallel combination?
A 12-V car battery is rated at 120 Ah. Assuming that the terminal voltage remains 12 V, for how long can this battery supply power at 29 W? How much charge flows through this battery in this time? H
If the field is always perpendicular to the proton's velocity, what is the field's magnitude if exiting protons have a kinetic energy of 12 ?
Take the mass of the sun to be = 1.99×1030 , the gravitational constant to be = 6.67×10-11 , and the acceleration due to gravity at the earth's surface to be = 9.810
If a sample of solid NaNO3 is weighed and submitted to acation exchange, an aqueous solution of what substance (compound)will emerge from the bottom of the Amberlite resin column?
Explain what happens to volume on the molecular level when the number of moles of gas is increased at a constant pressure and temperature.
A man in a maze makes three consecutive displacements. His first displacement is 5.50 m westward, and the second is 21.0 m northward. At the end of his third displacement he is back to where he star