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A 50.0-kg pole vaulter running at 10.0 m/s vaults over thebar. Her speed when she is above the bar is 1.0 m/s. Neglect air resistance, as well as any energy absorbed by the pole,and determine her altitude as she crosses the bar.
The energy of the first excited state of a hydrogen atom is -0.34 eV ± 0.0003 eV. What is the average lifetime of for this state
The masses of the Pluto and Charon are 1.31×10^22 kg and 1.52×10^21 kg, respectively, Where is the center mass of this system located
A small immersion heater can be used in a car to heat a cup of water for coffee or tea. What is its resistance
The allowed energies of a simple atom are 0.0 eV, 4.0 eV, and 6.0 eV. What wavelengths appear in the atom's absorption spectrum
An electron is accelerated through an electric potential of 255 V, Find the radius in cm of the subsequent circular path for this electron
in a double-slit interference experiment the wavelength is ? 652 nm the slit separation is d 0.150 mm and the screen
Consider a weathered rock or soil particle lying on a slope. How would the gravitational force pulling the particle downward along the land surface vary with the inclination of the slope.
A point charge at the origin of a coordinate system produces the electric field E = (36000 N/C)x on the x axis at the location x = -0.50 m.
You are standing at rest with respect to the earth holding a lance which you measure as 10 meters long and a knight traveling on horseback at .7c is holding a lance which he measures as 10 meters long. Which lance hits the other person first
A 42.5 mA current is carried by a uniformly wound air-core solenoid with 425 turns, a 19.5 mm diameter, and 13.0 cm length. Compute the inductance of the solenoid
An air puck of mass m1 = 0.32 kg is tied to a string and allowed to revolve in a circle of radius R = 1.1 m on a frictionless horizontal table. What is the horizontal force acting on the puck
to make ice a freezer that is a reverse carnot engine extracts 45 kj as heat at -14degc during each cycle with
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