1. A cart of mass m = 10 kg slides down a frictionless ramp and is made to collide with a second cart (initially at rest of mass m2 20 kg, which then heads into a vertical loop of radius 0.25 m as shown in Figure P7.66. Derive the expression of height h. in terms of radius r, from which cart 1 would need to start to make sure that cart 2 completes the loop without leaving the track and hence determine the value of h. Assume an elastic collision

In 1995 a research group led by eric cornell and carl wiemann at the university of colorado successfully cooled rubidium atoms to the 20-200 nk temperature range. assuming (incorrectly) that the rubidium atoms behave liké particles of a classical ideal gas, calculate the rms speed of a rubidium atom at a temperature of 112.0 nk. in the experiments one particular isotope of rubidium was used, rubidium-87. the molar mass of this isotope is 86.91 q/mol. tries 0/20 submit answer

The dominant wavelength of energy emitted by the sun is

He acceleration due to gravity on the surface of mars is about one third the acceleration due to gravity on earth’s surface. the weight of a space probe on the surface of mars is about