Answer and explanation:
1. To increases the accuracy of the measurement, the person should try to make sure the ruler is parallel to the object they are measuring. If they measure the object with the ruler not being parallel the measurement will end up larger then expected. To increase the precision the person must measure with the ruler in the same position each time.
2. A situation in which a set of measurements are precise but not accurate could be if a student measured an object at an incorrect angle many times, like the inaccurate measuring in the image above. All of the measurements would be inaccurate, but since they were all measured inaccuratly the same way, they will be precise.
3. An objects mass is defined as being the amount of matter in said object. An objects weight is defined as being the force exerted on an object by gravity. Although the man would weigh less on the Moon because there is less gravity, he still would not fit in his clothes because his mass has not changed.
It would be impossible to know how many would be heads up due to how many there are in the cup.
The human eye can detect light at wavelengths between 400 to 900 nanometers. That is why we call this part of the electromagnetic spectrum visible light.
The total charge on the right-hand side is 94-1=93, so the atomic number is <u>93</u>.
The total mass on the right-hand side is 239+0=239, so the mass number is <u>239</u>.