a lorry of mass 2000 kg moving with a speed of 50 km per hour to live with a drum of mass 25 kg at a police checkpoint. the velocity of the lorry after the impact of 34 kilometre-per-hour what is the velocity of the drum​

Which best describes the first law of thermodynamics as compared to the second law of thermodynamics? a. the first law describes how thermal energy is conserved but not the direction it moves. b. the first law describes the direction thermal energy moves but not how it is conserved. c. the first law describes how thermal energy can be created but not how it can be destroyed. d. the first law describes how thermal energy can be destroyed but not how it can be created.

Does the distance travelled by an oscillating mass between times t=0 and t2 equal the displacement of the particle over the same time period if t2> t/2? hint: consider a sine wave starting at t1=0, then consider a closing wave starting at t1=0, for your explanation.

Metals are good conductors of electricity because they