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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
Imagine that you are observing a spacecraft moving in a circular orbit of radius 500000 around a distant planet. You happen to be located in the plane of the spacecraft's orbit. You find that the sp
12.0 N force with a fixed orientation does work on a particle as the particle moves through displacement d= (2.00i - 4.00j + 3.00k) m. What is the angle between the force and the displacement if the
What is the molar concentration of the cleaning solution formed when 25.0 L ammonia gas,measured at 31°C and 735 torr, dissolves in enough water to give a final volume of 0.675L?
During the first putt, the ball rolls 5.8 m due east. For the second putt, the ball travels 1.7 m at an angle 20° north of east. The third putt is 0.50 m due north. What displacement (magnitude
The distance between two telephone poles is d = 53.5 m. When a 0.550-kg bird lands on the telephone wire midway between the poles, the wire sags h = 0.195 m. (a) How much tension does the bird produ
How long would it take an identical panel that is also oriented perpendicular to the incoming radiation to absorb the same amount of energy, if it were on an interplanetary exploration vehicle 1.75
A cook uses a microwave to heat a meal. The frequency of radiation is 2.45 x 10^9 s^-1. What is the energy of one mole of photons of this microwave radiation?
When 42.0 mL of HCl of unknown concentration react to completely dissolve a sample of magnesium metal according to the reaction below, 0.193 L of hydrogen gas were collected at 20.5 °C and apres
The reflected wave, when combined with the outgoing wave, produces beats at a rate of 1432 s-1. How fast is the speeder going?
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 7.0 and t
If Ka is 1.85 x 10^-5 for acetic acid, calculate the pH at one half the equivalence point and at the equivalence point for a titration of 50 mL of 0.100 M acetic acid with 0.100 M NaOH.
A student makes a simple generator by using a single square loop 10 cm on each side. The loop is then rotated at a frequency of 60 Hz in a magnetic field of 0.015 T. (a) What is the maximum emf outp