Aspecial standard weight, known to weight 10 n to high accuracy, is used to check the accuracy of two spring scales. on the first scale the weight gives a reading of 8.4 n. on the second scale the weight gives a reading of 9.1 n. the percent difference between the measurements of the two scales is %. (never negative.)

16 % and 9 %

Explanation:

Accurate reading = 10 N

reading of first balance = 8.4 N

reading of second balance = 9.1 N

Percentage difference in first reading

=

= = 16 %

Percentage difference in second reading

=

= = 9 %

0.11 m/s and 0.28 m/s should be correct

answer: the metamorphic rocks are formed when they are exposed to high pressure and high temperatures. this happens when one of the earth's plates comes in contact with the other plate by traveling in opposite directions, straight into each other or slipping under one another. the friction that is caused by this activity results in   melting of rocks and when it cools they are known as metamorphic rocks. this process needs a controlled amount of pressure and temperature otherwise it may turn into magma.