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An electronic flash attachment for a camera produces a flash by using the energy stored in a 770 µF capacitor. Between flashes, the capacitor recharges through a resistor whose resistance is c
In a heart pacemaker, a pulse is delivered to the heart 76 times per minute. The capacitor that controls this pulsing rate discharges through a resistance of 1.8 x 106. One pulse is delivered every
A simple Atwood's machine uses two masses, m1 and m2. Starting from rest, the speed of the two masses is 9.0 m/s at the end of 9.0 s. At that instant, the kinetic energy of the system is 80 J and ea
A battery has an internal resistance of 0.9. a number of identical light bulbs, each with a resistance of 41.4, are connected in parallel across the battery terminals. the terminal voltage of the ba
Two identical blocks made of extremely hard metal collide with equal and opposite velocities. Is such a collision closer to being completely inelastic? Where does any lost kinetic energy go? Assumin
A 1.80 kg block slides on a rough, horizontal surface. The block hits a spring with a speed of 1.85 m/s and compresses it a distance of 13.0 cm before coming to rest. If the coefficient of kinetic f
What is the combines mass of 225.08g. When a liguid is added to the beaker the combined mass is 238,544 g. what is the mass in grams of the liquid?
A 24 kg block slides with an initial speed of 14 m/s up a ramp inclined at an angle of 25o with the horizontal. The coefficient of kinetic friction between the block and the ramp is 0.6. Use energy
A current of 2.50 A was passed through an electrolytic cell containing molten CaCl2 for 4.50 hours. How many moles of calcium metal shoild be deposited?
Catching a wave, a 71 kg surfer starts with a speed of 1.3 m/s, drops through a height of 1.95 m, and ends with a speed of 8.2 m/s. How much nonconservative work was done on the surfer?
What is the physical basis for angle-bending strain? What might one do to verify that the global strain-energy minimum has been identified for a compound?
An electron with velocity v= 1.0 x 106 m/s is sent between the plates of a capacitor where the electric field is E = X V/m. If the distance the electron travels through the field is 1.0 cm, and it d
A series RC circuit has a time constant of 1.0 s. The battery has a voltage of 50 V and the maximum current just after closing the switch is 500 mA. The capacitor is initially uncharged. Calculate t
What is the relationship between the equilibrium constant (Kc)of a reaction and the rate constants for the forward (Kf) and reverse (Kr) reactions?
Two cylindrical resistors are made of the same material. The resistors, with resistance R1 and R2, have different radii, r1 and r2, and different lengths, L1 and L2. What is the relative values (r1/
How do you know how many atoms are there in an element? How do you name an element with the sitting out of amount of protons, electron and neutrons?
The half life for the first order conversion of cyclobutane toethylene,C4H8(g) --->2C2H4(g) is 22.7 s at a particular temperature. How many seconds are needed for the partial pressure of cyclobut
What is the acceleration (a) of the logs rolling down the hill? What is the magnitude of the frictional force of the rolling logs?
Find the emf induced in the toroid when the current decreases to 0.9 A from 2.6 A in a time of 0.13 s.
The activity of a radioisotope is 3000 counts per minute atone time and 2736 counts per minute 48 hours later. What is the half-life of the radioisotope?
Two long wire are connected parallel to each other at closest they ae 20.0 cm apart.what is the magnitude of the magnetic field at a point midway between them if the top one carries a current of 20.
How many excess electrons must be present on each sphere if the magnitude of the force of repulsion between them is 4.57 x 10^-21 newtons and the distance between two small spheres of equal charge i
Why was it necessaryto wash the crude methylcyclohexenes with aqueous sodium bicarbonate solution? List the manipulations where mechanical loss of productcould have occured.
A space explorer is moving through space far from any planet or star. He notices a large rock, taken as a specimen from an alien planet, floating around the cabin of the ship. Should he push it gent
A person stands on a scale in an elevator. As the elevator starts, the scale has a constant reading of 586 N. As the elevator later stops, the scale reading is 400 N. Assume the magnitude of the ac