What is the work required to raise a 10. kg object from the surface of the earth to a height of 2.0 m?

Mathematics

1 answer:

Damm [24]2 years ago

5 0

Work = force *distance
W= weight *height
W= (10kg) (9.8 N/kg)(2m) = 198 Joules
Hope this helps!

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the gestation period of rhinos (487 days) is what percent longer than the gestation period of dogs (65days).

marishachu [46]

percent change = ((new value) - (reference value))/(reference value) × 100%

... = (487 -65)/65 × 100%

... = 422/65 × 100%

... = 6.492 × 100%

... ≈ 649%

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4 0

3 years ago

If 9% of a number equals 10, find 90% of that number.

Levart [38]

Answer:

100

Step-by-step explanation:

In this problem 10 represents 9% of a number. So, to find 90% you must multiply 10 by 10. You do this because 9% times 10 equals 90%; therefore, 100 must be 90%.

This can also be proven through cross multiplication. To set up a proportion put the percent over the number like, $\frac{9}{10}=\frac{90}{x}$ . Then cross multiply to get the equation, $9x=900$ . Finally, divide both sides to get x=100.