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A worker drops a hammer from a ledge that is 41.1 meters above the ground. How long does he have to warn the people on the ground?
a laser beam is traveling through an unknown substance. when it encounters a boundary with air the angle of reflection
A cannonball is shot (from ground level) with an initial horizontal velocity of 33 m/s and an initial vertical velocity of 25 m/s. What is the initial speed of the cannonball
A pendulum of period 2s is released from rest at an inclination of 5 degrees to the (downward) vertical. Find it's subsequent angular position as a function of time
A uniform magnetic field is 30 degree to the plane of a circular loop 10 cm in diameter made of copper wire (diameter 2.5 mm). At what rate must the magnetic field change with the time
The helium-neon lasers most commonly used in student physics laboratories have average power outputs of 0.250 mW. compute the peak magnetic field strength
A stone is thrown horizontally at 65.0 from the top of a very tall cliff. Calculate its horizontal position and vertical position at 2.00 intervals for the first 10.0. Calculate the horizontal and vertical positions at time = 2 .
A steel guitar string has a length of 74 cm and thickness of 0.37 mm. It is under 35N tension. Calculate the wave speed in the string. The density of steel rho=7.84 x 10^3 kg/m^3.
Through 0.23 s, a wheel rotates through an angle of 2.98 rad as a point on the periphery of the wheel moves with a constant speed of 2.27 m/s. What is the radius of the wheel?
Some nucleus of 75X190 (atomic mass = 189.96182 u) undergoes - decay to become 76X1190 (atomic mass = 189.95844 u). What is the energy (in MeV) released in this process?
find the coefficient of linear expansion for the material of which the rod is made.
A person jumps up and down on a trampoline, while staying in contact with it. The motion is simple harmonic motion and it takes 1.90s to complete one cycle.
Suppose that a satellite is at a height of 1.21E+6 meter and use 6.38E+6 meter as the radius of the earth. Find by what fraction would the radius of the satellite orbit have
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