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A platinum resistance thermometer has resistances of 220.0 when placed in a 0°C ice bath and 262.8 when immersed in a crucible containing a melting substance. What is the melting point of this substance? (Hint: First determine the resistance of the platinum resistance thermometer at room temperature, 20°C.)
A 20 gram bullet is fired horizontally into a 400 gram block of wood suspended like a ballistic pendulum. Find the velocity of the bullet just before the impact
Four protons and four electrons are located inside a pyramid and are separate from each other, What is the net value of electric flux through the surface of the pyramid
a 20-ft long non-uniform rod rest with its two ends on scales. when a 120-lb person stands at the geometric center of
a 3250 kg open railroad car coasts along with a constant speed of 10.6ms on a level track. snow begins to fall
A 0.50 kg object on a 40 cm long string swings in a circle, on horizontal table, fritionless table. what is Tangential velocity of the block
A violin string 12.5 cm long and fixed at both ends oscillates in its n = 5 mode. The speed of waves on the string is 268 m/s, and the speed of sound in air is 348 m/s. What are (a) the frequency and (b) the wavelength of the emitted sound wave?
a uniform electric field has magnitude e 200 nc and is directed to the right. a particle with charge 3.7 nc moves
A boy exploring a cave drops a rock into a dark crevasse. He hears the rock strike the bottom 10.1 s after dropping it. Find the depth of the crevasse
A person is riding a bicycle, and its wheels have an angular velocity of 10.6 rad/s. How much time does it take for the bike to come to rest
The 150-lb man lies against lies against the cushion for which the coefficient of static friction is 0.5. Determine the resultant normal and frictional forces the cushion exerts on him if, due to rotation about the z axis, he has a constant speed v =..
Comet Halley has an orbital perios of 75 years and when it enters the inner Solar System, it passes within a few AU of the Sun. Determine the average distance of Comet Halley
You are arguing over a cell phone while trailing an unmarked police car by 26.0 m; both your car and the police car aretraveling at 110 km/h. Your argument diverts your attention fromthe police car for 2.0 s (long enough for you to look at the pho..
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