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A circus performer stretches a tightrope between two towers. He strikes one end of the rope and sends a wave along it toward the other tower. He notes that it takes the wave 0.730 s to reach the opposite tower, 20.0 m away. If a 1 meter length of the rope has a mass of 0.445 kg, find the tension in the tightrope.N
A proton and an alpha particle (charge = 2e, mass = 6.64 10-27 kg) are initially at rest, separated by 2.30 10-15 m. What are both of their speeds at infinity
At room temperature (20C) the area of a hole in a sheet of material is 5.505 cm2. What is the thermal coefficient of linear expansion for the material
A 890 kgcar is at the top of a 30m-long, 2.5degreeincline. Its parking brake fails and it starts rolling down the hill. find the speed of the joined cars at the bottom of the incline
When a beam of white light is incident (vertically) on a thin oil slick (n = 1.25) floating on water, What is the thickness of the oil slick
An object is placed to the left of a convex lens and on the optical axis. find the magnification of the image formed by the lense
The left ventricle of the heart accelerates blood from rest to a velocity of + 20.8 cm/s. How much time does blood take to reach its final velocity
When the skateboarder reaches the highest point, how far is this point horizontally from the end of the ramp.
In a local bar, a customer slides an empty beer mug down the counter for a refill. The height of the counter is 1.46 m. What was the direction of the mug's velocity just before it hit the floor
An air conditioner draws 15 A at 220-V ac. The connecting cord is copper wire with a diameter of 1.446 mm. how much power is dissipated in the wiring
The motor of an electric drill draws a 8.11 A current at the power line voltage of 120 V rms. What is the motor's power (in W) if the current lags the voltage by 27.1°
A concave mirror is of hemisphjerical shape with radius 40cm. A thin layer of unknown transparent liquid is poured into mirror. The mirror liquid forms a real image and another real image is formed by the mirror alone.
A 2.00×104kg railroad car is rolling at 1.00m/swhen a 5000kg load of gravel is suddenly dropped in.What is the car's speed just after the gravel is loaded
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