Mass is a physical property that describes the amount of matter in a substance. Mass is commonly measured in grams or kilograms using a triple-beam balance or an electronic balance. Weight is a physical property of matter that A. is measured in the metric system as pounds.
B. is always equivalent to an object's mass.
C. considers the gravitational force acting on an object.
D. can be measured using a graduated cylinder. Reset Submit​

Which statement is true? a. kepler's laws apply only to the motion of earth. b. kepler's laws can be used to predict eclipses. c. kepler's laws are true for a central force that is directly proportional to distance. d. kepler's laws can be deduced from newton's laws of motion and gravity.

What are two different ways you could find the value of a? explain these methods.

Consider a double atwood machine constructed as follows: a mass 4m is suspended from a string that passes over a massless pulley on frictionless bearings. the other end of this string supports a second similar pulley, over which passes a second string supporting a mass of 3m at one end and m at the other. using two suitable generalized coordinates, set up the lagrangian and use the lagrange equations to find the acceleration of the mass 4m when the system is released. explain why the top pulley rotates even though it carries equal weights on each side.