Which statements are examples of observations a scientist would make a classify rock? 1. a rock is larger than other rocks 2. a rock feels smooth to touch 3.a rock is formed from molten lava 4.a rock is made of different minerals 5. a rock cracks in half after a rainstorm

Ameter stick is pivoted at the 0.50-m line. a 3.0-kg object is hung from the 0.15-m line. where should a 5.0-kg object be hung to achieve equilibrium (the meter stick oriented horizontal and motionless)?

If jerome is swinging on a rope and transferring energy from gravitational potential energy to kinetic energy, is being done.

The atoms in a nickel crystal vibrate as harmonic oscillators with an angular frequency of 2.3 × 1013 rad/s. the mass of a nickel atom is 9.75 × 10-26 kg. what is the difference in energy between adjacent vibrational energy levels of nickel? (h = 6.626 × 10-34 j • s, , 1 ev = 1.60 × 10-19 j)