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A copper rod of cross-sectional area 12.2 cm2 has one end immersed in boiling water and the other in an ice-water mixture, which is thermally well insulated except for its contact by the copper. The length of the rod among the containers is 19.0cm, and the rod is covered by a thermal insulator to prevent heat loss from the sides. How many grams of ice melt each second? (The thermal conductivity of copper is 390 W/m-C°.)
Two children use a homemadetelephone consisting of two paper cups connected by an aluminumwire which is 8.4 m long, find the time for the sound to travel from one cup to the other
Approximately how many atoms make up our planet? For simplicity, suppose the average atomic mass of the atoms is 14 . Avogadro's number gives the number of atoms in a mole.
Determine the tension in each cable if boat has a mass of 490 kg and the angle of each cable is 50 degrees from the horizontal and the boat is being momentarily held at rest. Evaluate this to the tension when the boat is raised and held at rest so th..
Two trains, each having a speed of 27 km/h, are headed at each other on the same straight track. What is the total distance (in km) the bird travels
A charge of -2.95 µC is fixed at the center of a compass, What are the magnitude and direction of the net electrostatic force acting on the charge at the center
A heavy ball with a weight of 100N (m= 10.2 kg) is hung from the ceiling of a lecture hall on a 4.5-m-long rope. What is the tension in the rope at that point
In the Bohr model of the hydrogen atom, an electron (mass m=9.1×10?31kg) orbits a proton at a distance of 5.3×10?11m. How many revolutions per second does the electron make
A 4.57 MeV alpha particle from radium226Ra decay makes a head-on collision with a uranium nucleus. A uranium nucleus has 92 protons. What is the force on the alpha particle at the instant when it is at the distance of closest approach?
you push with a horizontal force of 56.0 against a 25.0 box pressing it against a rough wall to hold it in place. the
A 3.1 kg block slides down a frictionless ramp, as shown in the figure. The top of the ramp is 1.6 m above the ground; What is the speed of the block when it leaves the ramp
An 10m, 210N uniform ladder rests against a smooth wall. The coefficient of static friction between the ladder and the ground is 0.55, and the ladder makes a 50° angle with the ground. How far up the ladder can an 850N person climb before ladder b..
a diffraction grating 1.5 mm wide produces the fifth order pie/4 with light wavelength 650nm on the screen 80 mm away. What is the angle of the third order inside the water casing
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