the amount of a substance that contains as many elementary entities as the number of atoms in 12 g of the isotope carbon-12
1/12 the mass of an atom of the isotope carbon-12
the mass of one atom of the isotope carbon-12
the amount of a substance that contains as many nuclei as the number of nuclei in 12g of the isotope carbon-12
7. Which of the following is a correct statement of Newton's second law of motion?
The rate of change of momentum of a body is equal to the net external force acting on the body
A force acting on a body is proportional to the mass of the body
The momentum of a body is proportional to the net external force acting on the body
A force acting on a body is proportional to the acceleration of the body
8. The time taken for a stone dropped from rest to fall vertically through 16 m is 2.0s. Based on these measurements, what is the best estimate for the acceleration of free fall?
8.0 m/s
10 m/s
9.8 m/s
6 m/s
9. A wooden block is sliding down an inclined plane at constant speed. The magnitude of the frictional force between the block and the plane is equal to
zero
the magnitude of the componenet of the normal reaction parallel to the plane
the magnitude of the component of the weight of the block parallel to the plane
the magnitude of the weight of the block
10. The best estimate for time it takes light to cross the nucleus of the hydrogen atom is
