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A hydrogen atom emits a photon of energy 3.0 eV. If the atom is at rest before emitting the photon, what is the speed of the atom after emission?
The water in a pipe at a gauge pressure of 4.2 X105 N/m2 enters a building at ground level at a speed of 0.5 m/s during a round pipe 6 cm in diameter. The pipe tapers down to 3.1 cm in diameter by the top floor, 38 m above the ground level.
Two stars, with masses m1 and m2 that are initially very far apart and at rest (and even farther from any other stars) are pulled together by their gravitational attraction. Determine their relative speed when they are a distance d apart from one ano..
The passengers in a roller coaster car feel 50% heavier thantheir true weight as the car goes through a dip with a 40.0 m radius of curvature. What is the car's speed at the bottom of the dip
An equilateral triangle 10.0 meters on a side has 16.0 kg spheres whose center as are at each corner of the triangle. The spherical masses each have a radius of 0.5m. If the balls are released from rest, what speed will they have when they collide at..
Two identical capacitors are connected in parallel to an ac generator that has a frequency of 574 Hz and produces a voltage of 24 V. What is the capacitance of each capacitor
A 160 W street lamp is operated for 12 hours a day. How much energy does it take to operate the lamp
A baseball of mass 0.15kg approaches a batter at 30.0 m/s. Consider the ball as traveling horizontally toward the batter in the negative x-direction so that V= -30.0 i m/s. What is the work done by the bat on the ball
A projectile launched vertically from the plane of the Moon rises to an altitude of 370 kilometer. Determine what was the projectile's initial speed
a 15.0g plastic ball is dropped from a height of 2.60 m and is moving at 2.80ms just before it hits the floor how much
A train engine weighs 5 times as much as aflatbed car. If the engine coasts at 3 km/hr into the boxcarthat is initially at rest and becomes coupled to the boxcar, how fast do the two move after the inelastic collision?
Suppose a star the size of our Sun, but of mass 8.0times as great, were rotating at a speed of 1.0 revolution every11 days. what would its rotation speed be
A magnetic B field with strength 1 T passes through a metal square loop measuring 0.8 m on its side. If the B field is parallel to the loop's normal
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