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Q. A nylon string on a tennis racket is under a tension of 270 N. If its diameter is 0.96 mm, by how much is it lengthened from its untensioned length of 29.0 cm?
Q. A 220 g block on a 50.0 cm-long string swings in a circle on a horizontal, frictionless table at 95.0 rpm. what is the tension on the string.
A stone is thrown upward with an initial speed of 20 m/s. What is its acceleration at the highest point of its trajectory?
When people sleep, their metabolic rate is about 2.6 10-4 C/(s • kg). How many Calories does an 83 kg person metabolize though getting a good night's sleep of 9.0 hours.
Find out direction and magnitude of force
A 48.21 {rm kg} ice skater spins about the vertical axis through her body with her arms horizontally outstretched, making 2.20 turns each second. The distance from one hand to the other is 1.5 {rm m}. Biometric measurements indicate that each hand na..
A Cassegrain astronomical telescope uses two mirrors to form the image. Compute the radius of curvature of a secondary mirror
The sodium D line is a doublet consisting of two wavelengths, 588.995 and 589.592 nm. Calculate the angular separation between these two lines in the first-order spectrum for a grating with 4000 lines per centimeter. Repeat for the second order.
A person weighs 670N steps onto a spring scale in the bathroom, and the spring compresses by 0.79 cm. What is the spring constant? And what is the weight of another person who compresses the spring by 0.34 cm.
The coefficients of friction for plastic on wood are μs = 0.50 and μk = 0.40. How much horizontal force would you want to apply to a 4.0-lb plastic calculator to start it moving from rest.
The immediate environment of a reactor contains a large flux of 10 MeV gamma rays. Resolve the thickness of lead required to reduce the intensity by a factor of 1012. Assume the mass absorption coefficient of Pb for 10 MeV photons is m/r = 0.06 cm..
A stone is dropped at t = 0. A second stone, with 2 times the mass of the first, is dropped from same point at t = 190 ms. (a) How far below the release point is the center of mass of two stones at t = 390 ms? (Neither stone has yet reached the gr..
A meter stick, sitting on a frictionless table top, is struck by a wad of clay with a force, F = 4.0 N at an angle. The meter stick will rotate in the plane of the table. Conclude the magnitude of the torque about the axis of rotation located at t..
What mass (in grams) of steam at 100°C must be mixed with 377 g of ice at its melting point, in a thermally insulated container, to produce liquid water at 58.0°C? The specific heat of water is 4186 J/kg·K. The latent heat of fusion is 333 kJ/kg, ..
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