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A surveyor wants to find the distance across a river. A stake is placed on each bank of the river as shown in the figure. She measures a distance of 30.0 m from one stake to another on the same side of the river, thus finding the third vertex on a right triangle. She then measures the angle q and finds it equal to 75.9o. What is the distance across the river?
A 2 kg box is raised from rest a distance of 3 m by a vertical force of 110 N. Find the final kinetic energy of the box
A parallel-plate air-filled capacitor having area 41.0 cm2 and plate spacing 2.70 mm is charged to a potential difference of 360. V. calculate the energy density between the plates
a star of radius 7.8 times 105 km rotates about its axis with a period of 66 days. the star undergoes a supernova
A popular amusement park ride looks like a huge cylinder of radius 2.3 m, where people stand up along the vertical walls on top of a floor which can drop away. find the minimum rotations per second the cylinder must make
Standing at a crosswalk, you hear a frequency of 590 Hz from the siren of an approaching ambulance. Determine the ambulance's speed from these observations
an alpha particle charge 2.0 e is sent at high speed toward a gold nucleus charge 79e. what is the electrical force
Two ( and only two ) full spectral orders can be seen on either side of the central maximum when white light is sent during a diffraction grating. What is the maximum number of lines per cm for the grating?
a pair of power transmission lines each have a 1.90 resistance and carry 700 a over 9.8 km. assume that the rms input
A cart with mass 220 g moving on a frictionless linear air track at an initial speed of 1.0 m/s undergoes an elastic collision with an initially stationary cart of unknown mass. What is the mass of the second cart
q1. what effect will increase in temperature from 25 degree celsius to 32 degree celsius of the metal metre stick have
A gamma-ray telescope intercepts a pulse of gamma radiation from a magnetar, a kind of star with a spectacularly large magnetic field. The pulse lasts 0.16 s and delivers 9.5 x10 -6 J of energy vertically to the 59-m 2 surface area of the telescope..
An east-west electric power line carries a 500-A{\rm A} current toward the east. Determine the direction of this magnetic field at Earth's surface directly under the wire
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