In physics, is mass equal to weight or is gravity equal to weight?

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• 1. What is the molar mass of potassium ion
• 2. What is 53.9 times 10 minus 2
• 3. 4 plus 6 equals 10
• 4. What is 0.6 plus 5
• 5. Equal to, how to say in English
• 6. Three plus five equals eight
• 7. Because 259 is close to 260, 259 times 89 is about 260 times 80. Is that right or wrong?
• 8. What is 729 times 80 plus 1 times 250 plus 8755 plus 8755 minus 250 divided by 2
• 9. 2,3,4,5,6 fill in +, - sign equals 18 how to do
• 10. 32 times of 2 - 1 / 1 (2 + 1) (2 times of 2 + 1) (16 times of 2 + 1) 32 times of 2 - 1 / 1 (2 + 1) (2 times of 2 + 1) (4 times of 2 + 1) (8 times of 2 + 1) (16 times of 2 + 1)
• 11. The conversion of physical mass units, such as the power of several equal to several, requires kilogram, ton, milligram, gram, etc
• 12. The actual size on the drawing is 8 cm, and the conversion ratio is 1:700
• 13. The surface area of the earth is about 510 million square kilometers, which is equivalent to the total area of football fields? (football field area is about 7000 square meters) This number is quite large. How can we explain it to the students of grade one?
• 14. Mm to CM equals
• 15. How many times 1 equals 0.8 equals how many times 1 and 1 / 5 equals more
• 16. What is 0.6 times 3 / 5
• 17. What is 4 divided by 8 / 3 divided by 1 / 6?
• 18. 212×14+214×16+216×18+218×20+120．
• 19. 12,2,2,3,14,2,7,1,18,1,2,3,40,10,(),4 A．4B．2C．3D．1
• 20. Simple calculation of Grade Five score: 1 / (10 * 12) + 1 / (12 * 14) + 1 / (14 * 16) + 1 / (16 * 18)