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The drawing shows an equilateral triangle, each side of which has a length of 2.87 cm. Point charges are fixed to each corner, as shown. The 4.00 C charge experiences a net force due to the charges
Calculate collapse energy (i.e. PE change ) of World Trade Towers: 410 m tall; total mass 1.25 Mega tons; Calculate Change in PE in MJ during collapse. Assume that the whole mass is centered at an
What is the wavelength of the standing wave you create in the string? What is the frequency?
Energy content of gasoline is about 46 MJ/kg or about 37 MJ/Liter. How much energy consumed in kJ per hr? HP? in kW? BTU/h?
The other string is plucked in a different location, primarily exciting the 5th harmonic. The resulting sounds give rise to a beat frequency of 351 Hz. What is the wave propagation speed on the guit
You have a 2.09-m-long stretched string with a mass of 19.1 g. When you oscillate the string at 440 Hz, which is the frequency of the standard A pitch that orchestras tune to, you observe transvers
Today almost all beverage cans (>77 billion of them per year in the U.S.) are made of thin walled aluminum and can be mangled by infants. Since aluminum is more expensive than steel, why the chan
An electric dipole consists of charges +2e and -2e separated by 1.0 nm. It is in an electric field of strength 4.0 x 106 N/C. Calculate the magnitude of the torque on the dipole when the dipole momen
A uniform electric field exists in a region between two oppositely charged plates. An electron is released from rest at the surface of the negatively charged plate and strikes the surface of the op
Two particles are fixed to an x axis: particle 1 of charge -7.34 x 10-7 C is at the origin and particle 2 of charge +7.34 x 10-7 C is at x = 11.8 cm. Midway between the particles, what is the magnitud
Five kilograms of liquid water at 0° C is put into the freezer compartment of a Carnot refrigerator. The temperature of the compartment is -14.8° C, and the temperature of the kitchen is 26.
If the electric charge on the object is doubled while its mass remains the same, find the direction and magnitude of its acceleration.
A squirrel is resting in a tall tree when it slips from a branch that is 48 m above the ground. It is a very agile squirrel and manages to land safely on another branch after only 0.60 s. What is th
If the cloud is holding this maximum charge, what is the magnitude of the difference in electric potential between the cloud and the ground?
A parallel-plate capacitor has 1.82 cm2 plates that are separated by 4.40 mm with air between them. If a 12.0 V battery is connected to this capacitor, how much energy does it store?
Calculate the amount of the electric charge stored on each plate.
An airplane must reach a speed of 184 mi/h to take off. If the runway is 498 m long, what is the minimum value of the acceleration that will allow the airplane to take off successfully?
A hockey puck has an initial velocity of 44 m/s and a final velocity of 31 m/s. (a) If it travels 25 m during this time, what is the acceleration? (b) If the mass of the puck is 0.13 kg, what is the
The steam enters at 25 bar with a velocity of 61 m/s and exits as saturated vapor at 0.06 bar with a velocity of 130 m/s. Neglecting potential energy effects, determine the inlet temperature, in C?
Two charged balls, one with a charge of +5.0 micro coulombs and the other with a charge of +2.4 micro coulombs, are placed a distance d = 10.0 cm apart from each other and rigidly held in place.
What is the enthalpy change if the final temperature is 600oF; how much work is done if the final temperature is 600oF.
The object is in static equilibrium when the string is horizontal. Find the magnitude of the electric field. Find the tension in the string.
A pot of hot water is boiling on your stove. The pot is in the shape of a round cylinder made of aluminum which is 10 cm in radius. The aluminum is 3 mm thick. You notice that after 10 minutes, 0.1
In extremely cold weather conditions where the inside thermostat is set to 27 C and the outside temperature is -20 C, your 1200 square ft house might lose heat through the walls at a rate of 4270 W