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A light spring has an unstretched length of 35.0 cm. If one end is attached to the top of a door frame and a 7.50 kg weight is hung from the other end, the length of the spring is 41.5 cm. What is its spring constant?
Using a fast-pulsed laser and electronic timing circuitry, you find that light travels a distance of 2.55m within a plastic rod in a time interval of 10.9ns. What is the refractive index of the plastic
An 800-N man stands halfway up a 5 m long ladder of negligible weight. The base of the ladder is 3 m from the wall as shown. suppose that the wall-ladder contact is frictionless, wall pushes against the ladder with a force of what magnitude.
Suppose Fuzzy, a quantum-mechanical duck, lives in a world in which h = 2?J · s. Fuzzy has a mass of 1.80 kg and is initially known to be within a pond 1.00 m wide. What is the minimum uncertainty in the duck's speed
A racetrack has the shape of an inverted cone, as the drawing shows. On this surface the cars race in circles that are parallel to the ground, and the surface is at an angle = 40°. For a speed of 35 m/s, at what value of the distance d should a drive..
a point charge of -6 microc is located at x 1 m y -2 m. a second point charge of 12 microc is located at x 1 m y 3
Suppose you pour 19 g of water into 1.0 litres jar and seal it tightly. What will be the pressure of the vaporized water
A hot air balloon has just lifted off and is rising at the constant rate of 1.70 m/s. How high is the passenger when the camera reaches her
The resistance of a very fine aluminum wire with a 17?m x 17?m square cross section is 1200 ? . A 1200 ? resistor is made by wrapping this wire in a spiral around a 3.9-mm-diameter glass core
Two packing crates of masses 10.0 kg and 5.00 kg are connected by a light string that passes over a frictionless pulley. The 10.0 kg crate lies on an incline of angle 40.0° with a coefficient of kinetic friction 0.250.
An AC circuit has a voltage source amplitude of 200 V, a resistance of 500 ohms, an inductor of 0.4 mH, and a capacitor of 100 pF. What is the current amplitude in resonance
a 0.15 kg ball hits a wall with a velocity of 4.00 ms 5.50 ms 6.00 ms . it rebounds from the wall with a velocity of
Astronauts put their spaceship into orbit about a planet. Theyfind that the acceleration of gravity at their orbital altitude isone fourth that at the planet's surface. How far above the planet'ssurface are they orbiting? Answer in terms of the pl..
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