Across

Down

1. Changing geometrical cent gives fundamental force (15)

8. If it’s over 100% the first law is broken. (10)

10. A poser is perhaps standard. (5)

12. American city has two seconds with oxygen for cowboy’s aid. (5)

13. Abominable snowman loses current nevertheless. (3)

14. New born numb toe gives nasty weapon. (7,4)

16. Initially resistance is slowing electron rate in hot air balloon maybe. (5)

17. Mass area and temperature reverse onto aluminium for Mexican dish. (5)

19. Reversing time is what some nuclei do to alpha particles. (4)

21. It’s reported to go faster than the speed of light. (7)

23. Addressing head lice is only penalised once if missing in exams. (5)

28. Use thumb and fore finger to apply pressure on imperial unit. (5)

29. reorganised peace list is the result of stretching rubber. (7,1,1)

1. Cleaner gyroscope without current unit hides ability to work. (6)

2. Frost feels confused to exert no force. (10)

3. Mexican food man gets sharp projectiles to give site of famous resonator. (5,7)

4. Its square is itself.  (3)

5. Doctored cocaine alert is inevitable when pushers aren’t balanced. (12)

6. Galilean maybe is not from artisan manipulation. (14)

7. The sound of trendy Buddhist chant is represented by the capital of Chile. (7)

9. Flat surface gets unit of flux density for ancient Greek wanderer. (6)

11. A pair of lenses is twice the start of two. (7)

15. Push on Midge is constant according to Charles. (8)

18. The vertical distance between two points is penalised if IA is such. (7)

20. V around V gives currency. (4)

22. Tesla monkey could be sticky. (4)

24. A time constant is part of a circle. (3)

25. Short charge storage device fits on the head. (3)

26. 84 maybe? (2)

27. lifting weights or lifting weights. (2)