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A ball is thrown straight up by a speed of 30m/s.
a) How long does it take to reach the maximum height?
b) What is the Max height reached by the ball?
c) What is the speed after 4.2s?
In western movies, the hero sometimes detects an approaching trainby "listening" to the railroad tracks. If the tracks are made ofsteel, how many times faster does sound travel in the tracks thanin air?
Suppose you wish to fabricate a uniform wire from 1.60 g of copper. The wire is to have a resistance of R = 0.580 ? and all the copper is to be used, What must be the length of this wire
A silver wire has resistivety p = 1.62x10^-8 ?m ana cross sectional area of 5.00 mm^2. what is the displacement current in the wire
What is an angular acceleration
the shinkansen, the japanese train, runs at high speed. riding on the shinkansen, you notice that the frequency of a crossing signal changes markedly as you pass the crossing. what is the speed of the train
Helium (He), a monatomic gas, fills a 0.012 m3 container. The pressure of the gas is 6.90x 10^5 Pa. How long would a 0.25 hp engine have to run (1 hp = 746 W) to produce an amount of energy equal to internal energy of this gas.
The drawing shows an adiabatically isolated cylinder that is divided initially into two identicalparts by an adiabatic partition. Both sides contain one mole of amonatomic ideal gas (γ=5/3) with the initial temperature being 525 K on the left and ..
The distance between slitsin a double-slit experiment is decreased by a factor of 2. If the distance between fringes is small compared to the distance from theslits to the screen, the distance between adjacent fringes near the center of the interf..
The radioactive element radium ({\rm Ra}) decays by a process known as alpha decay, in which the nucleus emits a helium nucleus. (These high-speed helium nuclei were named alpha particles when radioactivity was first discovered, long before the ident..
A disk with mass m = 6.0 kg and radius R = 0.41 m hangs from a rope attached to the ceiling. The disk spins on its axis at a distance r = 1.26 m from the rope and at a frequency f = 18.0 rev/s (with a direction shown by the arrow). 1) What is the mag..
If a person exerts 44 N of force on the back of a seat while stopping in 0.4 seconds, what is the impulse on the seat back?
A guitar string with mass density ? = 0.00021 kg/m is L = 0.95 m long on the guitar. The string is tuned by adjusting the tension to T = 82.6 N. find With what speed do waves on the string travel
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