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While walking around your apartment in socks you shuffle your feet across the floor and realize that you've accumulated a positive charge of +9 nC (9 x 10^-9 C). How many electrons have been removed
A lamp which is 9.0 cm tall is in front of a concave mirror which has a focal length of 53.0 cm. (a) How tall is the lamp's image if the lamp is a distance of 26.5 cm from the mirror (include sign if
Question: An golf ball sits on the optical axis of a spherical mirror at a distance of 17 cm. A virtual image is formed a distance of 6 cm away from the mirror. What is the mirror's focal length (i
Give some examples of the applications of lasers in the medical field, industry, and in commerce?
The frequncy doubled output of a laser has a wavelength of 532nm. If each pulse of light has a total energy of 0.550J and the repetition rate of the laser is 30Hz, how many photons does the laser e
The height of a helicopter above the ground is given by h = 2.95t^3, where h is in meters and t is in seconds. At t = 2.50 s, the helicopter releases a small mailbag. How long after its release doe
A truck covers 42.0 m in 8.10 s while smoothly slowing down to final speed of 2.70 m/s. (a) Find its original speed. (b) Find its acceleration. (Indicate the direction of the acceleration with the
A hare and a tortoise compete in a race over a straight course 1.25 km long. The tortoise crawls at a speed of 0.300 m/s toward the finish line.
Assume that none of the alpha particles bounced back from the sheet, meaning that the alpha particles either were captured by the shielding or penetrated completely through the shielding. What perce
At three corners of a rectangle (length 11.8 cm, height 5.9 cm), the following charges are located: q1 (upper left corner), q2 (lower right corner), and q (lower left corner). The net electric fiel
A particle moves along a straight line with an acceleration of a = 2pi / (2s^(2/3) + 3s^(5/8)) m/s^2, where s is in meters. Determine the particles velocity when s = 2 m, if it starts from rest whe
A velocity "filter" with crossed electric and magnetic fields is designed to permit the passage of singly ionized 22-Ne atoms (atomic mass=22 unified atomic mass units) of energy 2.0*10^4 eV. The el
How would you calculate many electrons are transferred with each rotation by the Van de Graff generator? As is known, the Van De Graff generator is spherical and the one I used in particular had a c
Two spherical objects with a mass of 8.05 kg each are placed at a distance of 2.31 m apart. How many electrons need to leave each object so that the net force between them becomes zero?
Birds resting on a high-voltage power lines are a common sight. A certain copper power line carries a current of 52.7 A, and its resistance per unit length is 1.15 10-5 /m. If a bird is standing on
Question: A balloon is rubbed with a wool glove. The two items attract one another with a force of strength 0.6 N when they are 1 cm apart. If they have equal but opposite charges, a) what is the m
The charges on the circle are -3.90 µC at the position due north and +5.00 µC at the position due east. What is the magnitude and direction of the net electrostatic force acting on the c
The temperatures indoors and outdoors are 303 and 313 K, respectively. A Carnot air conditioner deposits 6.64 105 J of heat outdoors. How much heat is removed from the house?
Two equally charged insulating balls each weigh 0.32 g and hang from a common point by identical threads 50 cm long. The balls repel each other so that the separation between their centers is 6.0 c
Argue for or against the idea that Vd is equal to the instantaneous velocity of the glider when it is halfway through the photo gate in space.
An astronaut on a small planet wishes to measure the local value of the free-fall acceleration by timing pulses traveling down a wire that has an object of large mass suspended from it. Assume a wir
Is the buoyant force on an object that is attached to a light sting and submerged completely in water the same as the buoyant force on the same object when it is submerged completely in alcohol?
What is the magnitude of the acceleration of an electron at a point where the electric field has magnitude 6667 N/C and is directed due north?
What is Julie's average speed on the way to Grandmother's house? What is her average speed on the return trip?