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Pulling a string on a bow back with a force of 22.8 lb, an archer prepares to shoot an arrow. If the archer pulls in the center of the string, and the angle between the two halves is 121o, find what is the tension in the string?
cellphones use radio waves some at a frequency of 840.1 mhz. an efficient antenna is a quarter of a wavelength long.
Find the focal length of contact lenses that would allow a nearsighted person with a 145 cm far point to focus on the stars at night
A softball pitcher throws an underhanded pitch with the arm fully extended (straight at the elbow). Find the rotational kinetic energy of the pitcher's arm given its moment of inertia is 0.72 kg·m2
A force of 29.73 N is applied tangentially to a wheel of radius 0.34 m. This force causes an angular acceleration of 1.20 rad/s2. What is the rotational inertia of the wheel
Consider the Earth and a cloud layer 800 m above the planet to be the plates of a parallel-plate capacitor. what is the maximum charge the cloud can hold
An electron has an initial velocity of (15.0 j + 22.0 k) km/s and the constant acceleration of (3.00*10^12 m/s^22)i in a region in which uniform electric and magnetic fields are present. If B = (400 µT)i, find the electric field E.
You shine red laser light with wavelength 670 nm through two narrow slits where the spacing between the slits is 0.005 mm. You use a screen placed far from the slits to detect the interference pattern. What is the smallest angle where the path diff..
A car rounds a flat circular track with radius 210 m. The coefficient of static friction between the tires and track is 0.65. What's the maximum speed for the car
A grasshopper makes four jumps. The displacement vectors are (1) 25 cm, due west; (2) 23.5 cm, 50° south of west; (3) 24.5 cm, 56° south of east; and (4) 36 cm, 43° north of east. Find the magnitude and direction of the resultant displacement. Expres..
A person is riding a bicycle, and its wheels have an angular velocity of 16.1 rad/s. Then, the brakes are applied and the bike is brought to a uniform stop. During braking, the angular displacement of each wheel is 18.4 revolutions.
A board of mass 20 kg and length 4 m is supported by two scales, one a t the left end of the board, and the other at 3 m from that end. What is the reading on the scale at the left end
A uniform steel beam has a mass of 2070 kg. On it is resting half of an identical beam, What are the vertical support forces
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