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An electric field E with an average magnitude of about 150 N/C points downward in the atmosphere near Earth's surface. We wish to "float" a sulfur sphere weighing 5.9 N in this field by charging the sphere. What charge (both sign and magnitude) must be used?
Calculate escape velocity for an object started at the surface of the earth, going straight up. Neglect any complications due to the earth turning.
The third floor of a house is 10.00 m above street level. How much work is required to move a 170kg refrigerator to the third floor.
On a workday the average decibel level of a busy street is 84 dB, with 100 cars passing a given point every minute. what is the decibel level of the street
A commuting student leaves home and drives to school at an average speed of 41.0 km/h. What is the average velocity for the entire trip
A 5.0 µC point charge is placed in an external uniform electric field of 1.60 104 N/C. At what distance from the charge is the net electric field zero
A severe thunderstorm dumped 2.4 in of rain in 30 min on the town of area 21 km2. What mass of water (in kg) fell on the town? One cubic meter of water has a mass of 103 kg.
A parallel-plate capacitor has 1.65 cm2 plates that are separated by 4.17 mm with air between them, how much energy does it store
A wheel of radius 1.6m rotates at a uniform speed. If a point on the rim of the wheel has a centripetal acceleration of 2.3m/s2 , what is the point's tangential speed
An aircraft?weighing 971?N? is accelerated?at 9.1 m/s2 for 5 seconds, at which time the aircraft launches. What is the force required to launch the aircraft
A horse is pulling a buggy. the total force by the horse is 475N applied horizontally. What is the force of friction on the driver and buggy
The equation of a transverse wave on a string is y = (6.1 mm) sin[(30 m-1)x + (300 s-1)t] The tension in the string is 42 N. Find the linear density of this string
At the bottom, it hits another stationary car with equal mass. The two cars have Velcro and stick together. At what speed do the two cars move after the collision
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