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A concave mirror in an amusement park has a radius of curvature of 5 m. A child stands in front of the mirror so that she appears 2 times taller than her actual height. If the image is upright, how far is she standing from the mirror? Please round your answer to one decimal place.
A planet has a radius of 2.69 x 10^7 m and a mass of 3.06 x 10^25 kg. It orbits its sun at 1.15 x 10^11 m (assume a circular orbit) and the period of its orbit is 6.34 x 10^7 s. The mass of its sun is 9.22 x 10^31 kg. The radius of the sun is 1.50..
A .22 rifle bullet, traveling at 350 m/s, strikes a block of soft wood, which it penetrates to a depth of 0.130m. How much time is required for the bullet to stop
An electron moving at right angles to a 0.42 T magnetic field experiences an acceleration of 7.5 x 1015 m/s2. Find by how much does its speed change in 1 ns
A skyrocket explodes just as it reaches the top of its trajectory at a height 1.31 km above the ground. With what speed was the shrapnel ejected by the explosion
one mole of the carbon-12 isotope contains 6.022 times 1023 atoms. what volume in m3 would be needed to store one mole
an 55.0-n crate of apples sits at rest on a ramp that runs from the ground to the bed of a truck. the ramp is inclined
A conical pendulum has length 1 m and bob of mass 0.1 kg the angular speed of the bob is 14/√10 rad/sec, find the tension in the string.
Use these facts to explain why the count of unemployed people is not a valid measure of the extent of unemployment.
The magnetic field of an electromagnetic wave in a vacuum is Bz = ( 3.5 muT) sin ( 1.6×10^7 x - 2pi f t) , What is the wave's electric field amplitude
an old fashioned (vinyl) record rotates at a constant rate of 33 rpm. if it plays music for 16 mins, how far does a point on the edfe travel in meters
A student is reading a lecture written on a blackboard. The lenses in her eyes have a refractive power of 56.03 diopters, and the lens-to-retina distance is 1.827 cm. How far is the blackboard from her eyes
A muon is produced by a collision between a cosmic ray and an oxygen nucleus in the upper atmosphere at an altitude of 50 km, What is the velocity of a muon at the surface
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