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An observer on Earth sees an alien vessel approach at a speed of 0.60c. The fictional starship Enterprise comes to the rescue, overtaking the aliens while moving directly toward Earth at a speed of 0.90c relative to Earth. Find the relative speed of one vessel as seen by the other?
A string fixed at both ends is 8.81 m long and has a mass of 0.120 kg. It is subjected to a tension of 92.0 N and set oscillating. Give the frequency of that wave. What is the speed of the waves on the string?
A hospital patient receives a quick 500-cc blood transfusion during a needle with a length of 5.0 cm and an inner diameter of 1.0 mm. If the blood bag is suspended 0.85 m above the height where the blood where the blood first starts to flow into the..
An elevator cable can withstand a maximum tension of 19,500N before breaking. The elevator has a mass of 480 kg and a maximum acceleration of 2.24 m/s2. Engineering safety standards require that the cable tension never exceed two-thirds of the breaki..
a particle moving along the x axis in simple harmonic motion starts from its equilibrium position the origin at t 0
the drawing shows a skateboarder moving at 5.4 ms along a horizontal section of a track that is slanted upward by 48deg
A thermos contains 142 cm3 of coffee at 86.3°C. To cool the coffee, you drop two 10.1-g ice cubes into thethermos. The ice cubes are initially at 0 °C and meltcompletely. What is the final temperature of the coffee in degreesCelsius? Treat the coffee..
A 1,030-kg car is pulling a 285-kg trailer. Together, the car and trailer have an acceleration of 2.00 m/s2 in the positive x-direction. determine the force exerted by the trailer on the car
in the cathode ray tube in an old television set, electrons are accelerated from rest with a constant acceleration of magnitude 7.31*10^13 m/s2 during the first 2.77cm of tube's length; find the speed of the electron when they hit the screen
A battery is connected in series with a R = 0.31 ? resistor and an inductor, as shown in the figure below. The switch is closed at t = 0. The time constant of the circuit is ? = 0.20 s, and the maximum current in the circuit is I = 7.9 A.
A uniform 200 Newton board length L has two weights hanging from it. 300 N at l/3 from one end, and 400 N 3L/4 from the same end. Find what single additional force acting on the board
In compressing the spring in a toy dart gun, 4 Joule of work is done. Calculate the dart kinetic energy as it leaves the gun
A 156 kg coil of sheet steel is 0.80 mm thick and 50 cm wide. How long is the steel in the coil
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