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A student calculates the unknown liquid to have a density of 0.87 g/cm^3. If the class average for the density of the liquid was 0.81 g/cm^3, what should the student calculate as the percent error? (Report your answer to one decimal place.)
A high-voltage copper transmission line with a diameter of 2.60 cm and a length of 130 km carries a steady current of 1.03 103 A. what time interval does one electron travel the full length of the line
Question: For all generators: Eg = 1\"\"0°, χ1 = j0.25 For all transformers: χ1 = j0.75 [A] Write the Y and Z matrices. B] Write the model equation. [C] For each bus, find V, ρ and Q.
q1. the springs of a 1600 kg car compress 5.0 mm when its 65 kg driver gets into the drivers seat. if the car goes over
The box is cubical, measuring 0.390 m on a side, and the thickness of the walls is 3.00 10-2 m. In one day, 2.90 106 J of heat is conducted through the six walls. Find out the thermal conductivity of the box.
A round object has a rotational inertia of I = ?MR2, where ? is a constant, M is its mass and R is its radius. What fraction of the total kinetic energy is rotational
A 1.0kg grindstone in the shape of a uniform cylinder of radius 0.25m acquires a rotational rate of 18 rev/s from rest over a 6.4s interval at constant angular acceleration. Calculate the torque delivered by the motor
A guitar string is vibrating in its fundamental mode, with nodes at each end. The length of the segment of the string that is free to vibrate is 0.385 m. What is the amplitude of this standing wave
An electron starts from rest 75.5 cm from a fixed point charge with Q = -0.150 µC. How fast will the electron be moving when it is too far away.
A boy tosses a football upward. If the football rises a vertical distance of 4.1 m and the boy catches it at the same point he released it
Five kilograms of liquid carbon tetrachloride undergo a mechanically reversible, isobaric change of state at 1 bar during which the temperature change from 0 C to 20 C.
A steel tank is completely filled with 3.00 m^3 of ethanol when both the tank and the ethanol are at a temperature of 35.0C. what additional volume of ethanol can be put into the tank
Hoover Dam was built in the 1930s to provide electricity for the southwest U.S. and to prevent the wild Colorado River from flooding. how does pressure vary with depth along the wall of the dam
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