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Physical changes do not change what a substance is, whereas a chemical change results in a new substance being formed, so they do change what a substance is.
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It would be 7 M 4 m x 2 m equals 8 M - 1 =7
Answer:
37.5 N Hard
Explanation:
Hook's law: The force applied to an elastic material is directly proportional to the extension provided the elastic limit of the material is not exceeded.
Using the expression for hook's law,
F = ke.............. Equation 1
F = Force of the athlete, k = force constant of the spring, e = extension/compression of the spring.
Given: k = 750 N/m, e = 5.0 cm = 0.05 m
Substitute into equation 1
F = 750(0.05)
F = 37.5 N
Hence the athlete is pushing 37.5 N hard
B. Both of these types of lenses have the ability to produce real images.
