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What diameter must a copper wire have if its resistance is to be the same as that of an equal length of aluminum wire with diameter 3.26{\rm mm} ?
A 15 kg brick rests on a roof that is at an angle of 40º to the horizontal. What is the component of the force into the surface of the roof
The maximum speed of a small girl on a swing is 3.96m/s. Calculate how high above the ground is she at her highest point
A train is travelling up a 4.8^circ incline at a speed of 3.25m/s while the last car breaks free and begins to coast without friction.
Identify three examples of 19th century Impressionist painting or sculpture and three Post-Impressionist works. Explain how the six pieces of art fall into these two styles.
At a pressure of 0.0760 atm a constant-volume ideal gas thermometer reads a temperature of 345 K. What is the thermometer's triple point pressure, Pt
a) Determine the magnitude and direction of the electrostatic force acting on particle A in the figure given below due to particles B and C . The values of the charge on these particles are indicated in the figure.
A rocket is launched at an angle of 57.0° above the horizontal with an initial speed of 99 m/s. The rocket moves for 3.00 s along its initial line of motion with an acceleration of 30.0 m/s2. At this time, its engines fail and the rocket proceeds ..
The cockroach finds a bread crumb on the rim and, of course, stops. Illustrate what is the angular speed of the lazy Susan after the cockroach stops?
How much work is completed by the system in this process. Determine the increase in entropy produced by the parachutist; assume the air temperature is 21 degrees C. How much work is completed by the system in this process.
A horizontal plank of mass m and length L is pivoted at one end. The plank's other end is supported by a spring of force constant k. The moment of inertia of the plank about the pivot is .
When UV light of wavelength 260nm falls on a metal surface, the maximum kinetic energy of emitted electrons is 1.20eV. What is the work function of the metal
During a crash test, a car moving at 60 km/ hr collides with a rigid barrier and comes to a complete stop in 200 ms.
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