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An 1800 kg car stopped at a traffic light is struck from the real by a 900kg car. The two cars become entangled, moving along the same paths that of the originally moving car. If the smallest car were moving at 20m/s before the collision. What is the velocity of the entangled cars after the collision
A two-stage rocket moves in space at a constant velocity of +4300 m/s. The two stages are then separated by a small explosive charge placed between them. Immediately after the explosion the velocity of the 1130-kg upper stage is +5810 m/s. What is..
two solenoids of radii 2.0 cm and 5.0 cm are coaxial. they are each 25 cm long and have 500 and 2000 turns
a 310-n child is in a swing that is attached to a pair of ropes 1.80 m long. find the gravitational potential energy of
A sample containing beryllium (atomic mass 9 u), aluminum (27 u), and an unknown element is placed in a mass spectrometer. Identify the element, using its chemical symbol
Resistance and potential difference in an electrical circuit.
Estimate how many electrons there are in your body
Consider a solid sphere and a thin shell with the same radius and the same mass. Explain why the thin shell has a greater amount of intertia
to measure the speed of light fizeau used a rotating disk with equally spaced holes through which light could pass.
A railroad car weighs four times as much as a freight car. If the railroad car coasts at 5 km/h into the freight car that is initially at rest, how fast do the two coast together after they are coupled?
A walkway suspended across a hotel lobby is supported at numerous points along its edges by a vertical cable above each point and a vertical column underneath. how much does the point move down in meters
A certain ohmic resistor has a resistance of 45 ohms. A second resistor is made of the same material but is two times as long, What is the effective resistance of the two resistors in series
The base station antenna height is 50 m, the lowest mobile antenna height is 1.5 m, the frequency is 880 MHz, the standard deviation of the shadowing is 12 dB, and the maximum acceptable path loss is 140 dB. Calculate the maximum cell radius
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