第六章单元测试
- A 2-kg particle moves from velocity
to 
. What is the work done by the net force. （ ） - A 2-kg particle is projected from a table of height 3 m, with a speed 5 m/s. What is the mechanical energy of the particle as it drops down to the height 2 m. （ ）
- In which of the following motions, the work by the net force is zero.（ ）
- In which of the following situations, the mechanical energy is conserved.（ ）
- If non-conservative forces do the work, both mechanical energy and total energy are not conserved. （ ）
A:12 J B:22 J C:36 J D:16 J
答案:12 J
A:64.2 J B:33.8 J C:44.6 J D:83.8 J
A:motion with constant acceleration B:freely falling motion C:uniform circular motion D:motion with constant velocity
A:a block moving on a rough surface B:only conservative forces do the work C:a block freely falling and compressing a spring D:projectile motion
A:对 B:错
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