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A 2.75-gram air inflated balloon is given an excess negative charge, q1 = -3.00 × 10-8 C, by rubbing it with a blanket. It is found that a charged rod can be held above the balloon at a distance of d = 5.20 cm to make the balloon float. In order for this to occur, what polarity of charge must the rod possess? How much charge, q2, does the rod have? Assume the balloon and rod to be point charges. The Coulomb force constant is 1/(4? ?0) = 8.99 × 109 N·m2/C2 and the acceleration due to gravity g = 9.81 m/s2.
What is the greatest angle of elevation
A 5g lead bullet travelling at 370-m/s is stopped by a large tree. If half the kinetic energy of the bullet is transformed into internal energy and remains with the bullet whilst the other half is transmitted to the tree, what is the increase in t..
A tank with a volume of 0.150 m contains 27.0 degrees celcius helium gas at a pressure of 100 atm. How various balloons can be blown up if each filled balloon so a sphere 30.0 cm in diameter at 27.0 and absolute pressure of 1.20atm .
What is the magnitude of the normal force that each brake pad applies to the rim . find the length of the meterstick as measured in frame S1 according to classical physics. Reply in units of m.
Extimate the thickness of a glass at a bright fringe and the Brewster's angle for light traveling from air to glass.
Arlene is to walk across a high wire strung horizontally between two buildings 11.0 m apart. The sag in the rope when she is at the midpoint is 10.0°. If her mass is 56.0 kg, what is the tension in the rope at this point.
A person swimming underwater sees a lifeguard who is standing in the shallow part of the pool; the water comes up to the lifeguard's waist. In what way does the swimmer see lifeguard's upper body distorted.
A student yells across a street at a concrete wall. The student hears an echo 0.500 seconds later. If the speed of sound in air is 343 m/s, what is distance from the student to the wall only.
A car moving at 10 m/s crashes into a barrier and stops in 0.050 s. There is a 20 kg child in the car. Assume that the child's velocity is changed by the similar amount as the car's in the similar time period.
An Oscilloscope grid is calibrated so that one square represents 1-V vertically and 1 msec horizontally. If the height of a square wave pulse display is 6 squares, the width of the pulse is 7 squares, and the cycle of the wave is 16 squares, the a..
A 62.00kg student is standing atop a spring in an elevator that is accelerating upward at 3.8 m/s2. The spring constant is 2600-N/m. By how much is the spring compressed.
A worker stands still on a roof sloped at an angle of 21° above the horizontal. He is prevented from slipping by a static frictional force of 400 N. Find out the mass of the worker.
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