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3 years ago

11

Please help with 19 and 20 and explain

2 answers:

Verizon [17]3 years ago

4 0

It should be 15 and 8.6

Talja [164]3 years ago

3 0

The answer is 15 and 8.6

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Scientists predict that there is a 0.8 chance that there will be an earthquake in San Francisco this year. How likely is that th

Firlakuza [10]

Answer:

80%

Step-by-step explanation:

8 0

3 years ago

What is 2/9 divided by 3?

Kryger [21]

((2÷9))÷3
(0.222)÷3
=0.074

3 0

3 years ago

Please help Anyone I'm seriously almost done

sp2606 [1]

Answer:

$\textsf{x = 45}$

Here, the given 2 angles are complementary angles. The sum is <u>90 degrees</u> as indicated by the right angle symbol.

$\textsf {Solving :}$

$\implies \textsf{x - 2 + 47 = 90}$

$\implies \textsf{x + 45 = 90}$

$\implies \textsf{x = 45}$

5 0

2 years ago

Use Hooke's Law to determine the work done by the variable force in the spring problem. A force of 450 newtons stretches a sprin

vlada-n [284]

Answer:

The work done is 202.50Nm

Step-by-step explanation:

Given

$F =450N$

$x_1 = 30cm$

$x_2 = 60cm$

Required

The work done

First, we calculate the spring constant (k)

$F = kx_1$

$450N = k *30cm$

$k = \frac{450N}{30cm}$

$k =15N/cm$

So:

$F = kx_1$

$F(x) = 15x$

The work done using Hooke's law is:

$W =\int\limits^a_b {F(x)} \, dx$

This gives:

$W =\int\limits^{60}_{30} {15x} \, dx$

Rewrite as:

$W =15\int\limits^{60}_{30} {x} \, dx$

Integrate

$W =15 \frac{x^2}{2}|\limits^{60}_{30}$

This gives:

$W =15 *\frac{60^2 - 30^2}{2}$

$W =15 *\frac{2700}{2}$

$W =15 *1350$

$W =20250N-cm$

Convert to Nm

$W =\frac{20250Nm}{100}$

$W =202.50Nm$

7 0

3 years ago

Simplify the ratio 0.08:0.12

mr Goodwill [35]

$0.08:0.12\\\\0.08\cdot100=8\\0.12\cdot100=12\\\\0.08:0.12\to8:12\\\\8:4=2\\12:4=3\\\\0.08:0.12\to8:12\to2:3$

4 0

3 years ago

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