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A styrofoam ball of mass 0.120 g is placed in an electric field of 6000 N/C pointing downward. What charge must be placed on the ball for it to be suspended?
A gry is an old English measure for length, defined as 1/10 of a line, where line is another old English measure for length, defined as 1/12 inch. A common measure for length in publishing business is a point, defined as 1/72 inch. What is an area..
Every year, there is a foot race to the top of the Empire State Building. The vertical distance traveled (using the stairs!) is about 440 m. what was his average power output during the race
A visual binary has a parallax of 0.4" (arcsec), a maximum separation (in arcsec) of a=6.0", and an orbital period P=80 y. What is the total mass of the binary system
q1. a 1590 kg car starts from rest on a horizontal road and gains a speed of 61 kmh in 30 s a what is its kinetic
Ten cars at an intersection are blowing their horns simultaneously, What is the average sound level for each car
A student holds a tuning fork oscillating at 260 Hz. He walks towards a wall at a constant speed of 1.16 m/s. How fast must he walk away from the wall to observe a beat frequency of 4.50 Hz
A tank of gasoline (n = 1.40) is open to the air (n = 1.00). A thin film of liquid floats on the gasoline and has a refractive index that is between 1.00 and 1.40. What is the refractive index of the film
A car is driven east for a distance of 47 km, then north for 25 km, and then in a direction 29° east of north for 29 km. find (a) magnitude (in km) of car's total displacement from its starting point and (b) the angle (from east) of the car's total..
The sun can be considered an ideal blackbody radiator at a temperature of 5900K, What is the peak wavelength of the distribution
Superman leaps in front of Lois Lane to save her from a volley of bullets. In a 1-minute interval, an automatic weapon fires 152 bullets, Find the average force exerted on Superman's chest
A block hangs in equilibrium from a vertical spring. When two other identical blocks are added, the original block sags by 5.0 cm. What is the oscillation frequency of the three-block system
A uniform electric field of magnitude 380 N/C pointing in the positive x-direction acts on an electron, What is the work done by the field on the electron
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