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A soccer player kicks a rock horizontally off a 41.3 m high cliff into a pool of water. If the player hears the sound of the splash 3.10 s later, what was the initial speed given to the rock? Assume the speed of sound in air to be 343 m/s.
Electrons are accelerated through a potential difference of 39.0 V. The beam of electrons then passes through a single slit. estimate the width of the slit
A 15 kg box is being pushed across the floor at 1.7 m/s to the right. When the pushing force is removed, find the frictional force exerted on the box by the floor
Nichrome wire of cross-sectional radius 0.754 mm is to be used in winding a heating coil. calculate the length of wire you must use to wind the coil
A thin soap film (n = 1.35) is suspended in air. The spectrum of light reflected from the film is missing two visible wavelengths of 490.8 nm and 589.0 nm, What is the thickness of the soap film
A soccer ball lying on the ground is kicked with an initial velocity of 10.0 m/s at an angle of 37 degrees above the horizontal. How far over does it land on the ground?
A uniform, spherical cloud of interstellar gas has mass 2.0x10^30 kg, and radius 1.0x10^13 m and is initially rotating with a period of 1.4x10^6 yrs. what will be the star's rotational period
Find the energy, in joules, of one quantum of energy for an atomic oscillator in a block of aluminium.
You lower a weight of metal in a beaker filled with water standing on a scale. When metal weight hangs above the water weighs 179.6 grams, What is the metal weights density
an electromagnetic wave travelling the z direction has a maximum magnetic field of 10-7 t in the negative y direction
A person walks first at a constant speed of 4.80 m/s along a straight line from point a to point b and then back along the line from b to a at a constant speed of 3.30 m/s. What is her average speed over the entire trip?
question a 0.410-kg ball is dropped from rest at a point 4.30 m above the floor. the ball rebounds straight upward to a
A vertical solid steel post of diameter d = 24cm and length L = 2.10m is required to support a load of mass m = 8200kg. What is the strain in the post
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