Acopper ball and an aluminum ball of mass 150 g each are heated to 100°c and then cooled to a temperature of 20°c. the heat lost by the copper ball is 4.6 kj. the heat lost by the aluminum ball is 10.8 kj. what is the specific heat of copper, if the specific heat of aluminum is 0.90 j/g°c?

Which property is expressed in distance units? o a. period o b. wavelength o c. speed o d. frequency

An alpha particle with kinetic energy 12.5 mev makes a collision with lead nucleus, but it is not "aimed" at the center of the lead nucleus, and has an initial nonzero angular momentum (with respect to the stationary lead nucleus) of magnitude l = p0 b, where p0 is the magnitude of the initial momentum of the alpha particle and b=1.40×10−12 m. (assume that the lead nucleus remains stationary and that it may be treated as a point charge. the atomic number of lead is 82. the alpha particle is a helium nucleus, with atomic number 2.) what is the distance of closest approach?

What is the relationship between globular clusters and the milky way?