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A student drops two metallic objects into a 120 g steel container holding 150 g of water at 25°C. One object is a 240 g cube of copper that is initially at75°C, and the other is a chunk of aluminum that is initially at 5.0°C. To the surprise of the student, the water reaches a final temperature of 25°C, exactly where it started. What is the mass of the aluminum chunk?
Use the value of the Sun's luminosity (3.90×10^26 watts, or 3.90×10^26 joules per second) to calculate what mass of hydrogen the Sun will convert into helium during its entire main-sequence lifetime of 1.2×10^10 years.
The density of bcc iron is 7900 kg/m3 and its atomic weight is 56. Calculate the side of the cubic unit cell and the interatomic spacing
A certain parallel-plate capacitor is filled with a dielectric for which ? = 4.5. The area of each plate is 0.026 m2, find the maximum energy that can be stored in the capacitor
When an object is moving with uniform circular motion, which of the following statements is correct for the tangential velocity? It acts towards the center, It acts away from the center, It is perpendicular to the plane of the circle, or It is per..
Which state is best illustrates kinetic friction
Two charged particles, Q1 = +4.90 nC and Q2 = -2.80 nC, are separated by 36.0 cm. What is the electrical potential energy of the pair
A 2.00×10-2- cube of ice at an initial temperature of -19 is placed in 0.670 of water at 44.0 in an insulated container of negligible mass.
A comet has a very elliptical orbit with a period of 123.0 years. what is its greatest distance from the Sun in AU
A sphere of radius R has a charge Q. The electric field strength at a distance r > R is Ei. What is the ratio Ef/Ei of the final to first electric field strength if Q is halved.
A block of wood with volume V floats in water with 0.62V submerged. In oil the block floats with 0.86V of its volume submerged. Find the density of the wood
What approximations or simplifying assumptions must you make in the calculations? (Note: Some of these choices are false because they are wrong physics!)
q1. a 51-kg person on skis starts from rest down a hill sloped at 32deg from the horizontal. the coefficient of
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