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A lighthouse sweeps its beam of light around in a circle once every 7.5 s. To an observer in a spaceship moving away from Earth, the beam of light completes one full circle every 15 s. What is the speed of the spacecraft relative to Earth?
An electric motor has a 840-turn coil on its armature. The coil is circular with diameter 17cmand carries 10.0A, ind the maximum torque on the coil when it rotates in a 1.20T magnetic fiel
select the quantity that has changed(velocity or speed) for a car that travels north at 88 km/h and then turns east while continuing to move at 88 km/h. define your answer.
An engine does 17200 J of work and rejects 6470 J of heat into a cold reservoir whose temperature is 272 K
a styrofoam ball of mass 0.120 g is placed in an electric field of 6000 nc pointing downward. what charge must be
A car takes 9 s to go from v = 0 to v = 75 m/s at approximately constant acceleration. If you wish to find the distance travelled using the equation d = 1/2 at2, what value should you use for a.
Light from a laser falling on two slits produces the third-order fringe at an angle of 8.8 degrees. what is the distance between the two slits
A uniform rod of mass 3.05×10^-2?2kg and length 0.370m rotates in a horizontal plane about a fixed axis through its center, compute the angular speed of the rod after the rings leave it
q1. suppose a uniformly charged with a linear charge density wire starts at point 0 and rises vertically along the
In the figure below, a nonconducting rod of length L = 8.50 cm has charge -q = -4.32 fC uniformly distributed along its length. What is the linear charge density of the rod?
on turning a corner ,a motorist rushing at 44m/s find a child on road 100m away. he applies the brakes so as to stop the motorcar within 1m of child. calculate the time required to stop.
A 50 kg child jumps into a small pool of water through a distance of 3 m and aquires 1000 J of kinetic energy. Assuming all of this energy goes into heating 10 kg of water in the pool, what is the change in temp of the water?
displacement 1 is in the yz plane 58.0deg from the positive direction of the y axis has a positive z component and has
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