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After 35 minutes of running, at the 9km points in a 10km race, you find yourself 100 m behind the leader and moving at the same speed. what should your acceleration be if you are to catch up by the finish line? assume that the leader maintains a constant speed throughout the entire race
When a high-power laser is used in the Earth's atmosphere, the electric field associated with the laser beam can ionize the air, At this maximum intensity, what power can be delivered in a cylindrical beam of diameter 3.98 mm
A rock of mass 0.210 kg falls from rest from a height of 20.8 m into a pail containing 0.429 kg of water. determine the rise in temperature of the rock
The work done in accelerating a flywheel from rest to an angular speed of 14.8 revolutions per second is 12.4 kJ. What is the moment of inertia of the flywheel
An instructor wants to use a lens to project the real image of a light bulb onto a screen 1.23 m from the bulb. In order to get the image to be two times as large as bulb, what focal length lens will be required.
a man stands on the roof of a building of height 16.1m and throws a rock with a velocity of magnitude 26.8 m/s, Calculate the maximum height above the roof reached by the rock
A 0.873-kg block is held up against a ceiling by a pole that makes an angle of 21 degree with respect to the vertical; What minimum force in the pole is necessary to get the block moving
A ball is thrown straight up from the edge of the roof of the building. A second ball is dropped from the roof a time of 1.01 s later. You may ignore air resistance.
The average power used by a stereo speaker is 56 W. Assuming that the speaker can be treated as a 7.7- resistance, find the peak value of the ac voltage applied to the speaker
Two loudspeaker, 4.0 m apart and facing each other, play identical sounds of the same frequency. You stand halfway between them, where there is a max. of sound intensity. moving from this point toward one of the speakers, you encounter a min. of s..
A negative charge -0.550 µC exerts an upward 0.600 N force on an unknown charge 0.260 m directly below it. What is the unknown charge (magnitude and sign)
Steam enters an isentropic turbine at an initial condition of 3.5 MPa and 400°C and leaves at a pressure of 175 kPa. Determine the work produced by this turbine
In a diagnostic procedure a patient in a hospital ingest 80 mCi of gold-198 ( half life time is 2.7 days) what is the activity of the gold source in the end of a month ( after 30 days)
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