Suppose you want to move the block, but you want to push it with the least horizontal force possible to get it moving. With what horizontal force F must you be pushing the block just before the block begins to move?

One object has a mass of 1 kg and another object has a mass of 3 kg. if the speeds are the same, which of the following is true about their kinetic energy?

How many neutrons does element x if it’s atomic number is 28 and its mass number is 87

The protons in a nucleus are approximately 2 ✕ 10^−15 m apart. consider the case where the protons are a distance d = 1.93 ✕ 10^−15 m apart. calculate the magnitude of the electric force (in n) between two protons at this distance.