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At 20 C, a steel rod of length 40.000 cm and a brass rod oflength 30.000 cm, both of the same diameter, are placed end to endbetween two rigid supports 70.000 cm apart, with no initial stressin the rods. The temperature of the rods is now raised to 60C.
(a) What is the stress (the same in both rods) at 60 C.
(b) How far from its old positioin is the new junction between therods?
Several people are riding in a hot air balloon. The combined mass of the balloon and the people totals 355 kg. how much mass should be dropped overboard so that the system acquires a net upward acceleration of .150 m/s2
Two rocks collide in outer space. Before the collision, one rock had mass 15 kg and velocity ‹ 4300, ?2700, 2350 › m/s. what is the velocity of the other rock
A 2.65-g copper coin at 21.5°C drops 60.0 m to the ground. (Assume the specific heat of copper is 387 J/kg · °C.) determine the coin's final temperature
A hydrogen atom is in its ground state when its electron absorbs a 48-keV photon. What's the energy of the resulting free electron
A copper washer is to be fit in place over a steel bolt. Both pieces of metal are at 29.7°C. to what temperature must the washer be raised so it will fit over the bolt
A boy whirls a stonein a horizontal circle 1.6 m above the ground, by means of a string1.4 m long. The angle between the string and horizontal plane is 10degrees. The string breaks,the stone flies of horizontally, and strikes the ground 6 m away.What..
When a battery is connected to the plates of a 6.00-µF capacitor, it stores a charge of 108.0 µC. What is the voltage of the battery? If the same capacitor is connected to another battery and 90.0 µC of charge is stored on the capacitor, what is ..
A string 2.0 m long has a mass of 2.4 x 10-2 kg. When fixed at both ends, it vibrates with a fundamental frequency 150 Hz. What is the speed of the wave on this wire? What is the frequency of its third harmonic?
A charge of 2.50 is held fixed at the origin. A second charge of 2.50 is released from rest at the position (1.25 , 0.570 ). If the mass of the second charge is 2.75 , what is its speed when it moves infinitely far from the origin
A projectile is fired straight upward from Earth's surface with a speed that is 0.816 times the escape speed. what is the highest altitude reached measured from the surface of the Earth
Two identical particles of mass m approach each other at equal and opposite speeds, v. How much kinetic energy was lost in this collision
A 66 KG trampoline artist jumps vertcally upward from the top of a platform with a speed of 5.4 m/.s. A) What is his speed as he lands on the trampoline, 3 m below his jump off point? B) If the trampoline behaves like a spring with spring stiffnes..
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