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Three forces act on a moving object. One force has a magnitudeof 72.3 N and is directed due north. Another has a magnitude of52.7 N and is directed due west. What must be (a) the magnitude and (b) the direction of the third force, such that the object continues to move with a constantvelocity? Express your answer as a positive angle south of east.
A "110-watt" lightbulb uses an average power of 110 W whenconnected to an rms voltage of 120 V. What is the resistance of the lightbulb?
In the final part of its life cycle a particular rotating spherical star expands to four times its normal diameter. How is the period of rotation affected
The blood speed in a normal segment of a horizontal artery is 0.162 m/s. What is the difference in blood pressure between the normal and constricted segments of the artery
Let us use the uncertainty principle to (very roughly) estimate the size of a hydro- gen atom. Picture the hydrogen atom as an electron orbiting a proton at close to the speed of light.
Astronomers discover an exoplanet (a planet of a star other than the Sun) that has an orbital period of 3.31 Earth years in its circular orbit around its sun
A 108m long train starts from rest (at t=0) and accelerates uniformly. At the same time (at t=0), a car moving with constant speed in the same direction reaches the back end of the train. find the cars speed and the trains acceleration
A copper rod of cross-sectional area 14.5 cm2 has one end immersed in boiling water and the other in an ice-water mixture, How many grams of ice melt each second
A 2.38 mol sample of an ideal gas expands reversibly and isothermally at 278 K until its volume is doubled. What is the increase in entropy of the gas
A primitive diving bell consists of a cylindrical tank with one end open and one end closed. The tank is lowered into a freshwater lake, open end downward. Water rises into the tank, compressing the trapped air, whose temperature remains constant ..
A hollow, thin-shelled ball of mass m rolls along a horizontal surface with a translational speed of v. What percent of its total kinetic energy is translational
An undiscovered planet, many lightyears from Earth, has one moon in a periodic orbit. This moon takes 1710 * 10^3 seconds, calculate the moon\'s radial acceleration.
An object placed 10.0 cm from a concave spherical mirror produces a real image 8.00 cm from the mirror. what is the position of the image
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