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A storm window having the same thickness of glass is installed parallel to the first window, with an air gap of 6.7 cm between the two windows. What now is the rate of energy loss if conduction is t
What would be the orbital period if the earth were replaced by a star of mass equal to the solar mass, in a circular orbit, with the distance between the sun and star equal to the present earth-sun
Find the net force acting on a +2.50 C charge placed at the origin from 3 equal charges of -1.25C placed at the positions (0.250m,0.250m);(0m,0.250m);(-0.250m, 0.250m).
The patterns on the faces of the coin and the grooves on its edge have a negligible effect on its area. Assume the price of gold is $19.7 per gram. (a) Find the cost of the gold added to the coin.
Question: A spherical object has an outside diameter of 50.0 . Its outer shell is composed of aluminum and is 1.80 thick. The remainder is uniform plastic with a density of 810. Determine the object
Question: An object is placed 14.6 cm in front of a concave mirror with a focal length equal to 3.00 cm. (a) Find the location q (cm) of the image. (b) Find the magnification M. Give the answers to
Three point charges lie along a straight line as shown in the figure below, where q1 = 6.36 µC, q2 = 1.46 µC, and q3 = -1.98 µC. The separation distances are d1 = 3.00 cm and d2 =
What is the tension on the right rope? Book answer is 25N calculated as follows: Tension on left rope is 10N because Fnet=Ftension(20kg) (why?)
A nearest-neighbor pair of Mg2+ ions are separated by a distance of square root 2 a0. Calculate the coulombic force of repulsion between the ions. Please show your work.
Question: It takes 7.769 days for Jovian moon to circle jupiter. Find the moons orbital speed if its obital distance is 421,700 km.
Question: A small boat takes 3hr to o downstream from point A to point B and 6hr to come back. How long will it take the boat to go downstream with its engine cut off?
How long does it take electrons to get from the car battery to the starting motor? Assume the current is 140 A and the electrons travel through copper wire with cross sectional area 28.9 mm2 and le
Question: A light stick with two masses attached to it is spinning about its center at 5 revolutions per minute. The length of the stick is 2.5 meters and the masses are 1.5 kg each. What are the a
what will be the frequency heard by the observer. If the frequency emitted by the horn is 2000 Hz . The speed of sound is 343 m/s
Question: Two ocean liners with a mass of 50,000 metric tons are 50 m apart. What is the magnitude of the acceleration of one of the liners toward the other due to their mutual gravitational attrac
A simple harmonic oscillator takes 3.0 seconds to undergo 30 complete vibrations. Find the frequency in Hz, time period, and angular frequency in rad/s
Find the net electrostatic fornce exerted on the the +1nc charge. Assume medium is a vacuum. Book answer is Fnet= 3 x 10^-7 N. Please show step by step solution.
Question: A charge of -1.0 µC is located at the origin, a second charge of 3.4 µC is located at x = 0, y = 0.1 m, and a third charge of 5 µC is located at x = 0.2 m, y = 0. Find th
Question: An ambulance has a siren of frequency 700 Hz. If the ambulance is moving at a speed of 60 miles per hour, what will be the frequency heard by a man standing on the sidewalk as the ambulan
Only 30% of the people in a large city feel that its mass transit system is adequate. If 25 persons are selected at random,
A piano string having a mass per unit length equal to 4.00 × 10-3 kg/m is under a tension of 1100 N. Find the speed with which a wave travels on this string.
We wish to determine the index of refraction (n) of a medium by measuring how much light bends when it travels from one medium to another. The law relating angles and indexes of refraction is Snell
The planet Venus requires 225 days to orbit the sun, which has a mass M = 1.99 x 1030 kg, in an almost circular trajectory. Calculate the radius of the orbit of Venus and the orbital speed of Venus
Question: A horizontal merry-go-round has a mass of 1000 kg, and is a solid disk of radius 2.00 m. It is started from rest by a constant horizontal force of 50.0 N applied tangentially to the edge o