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Gennadij [26K]
3 years ago
9

Why does a skateboard on top of a ramp have potential energy.

Mathematics
1 answer:
saveliy_v [14]3 years ago
3 0

Answer:

Conservation of Energy

Step-by-step explanation:

This is because of friction which changes kinetic energy into heat. ... When a skater is at the top of the ramp he has the highest amount of potential energy. Kinetic energy is the energy of motion. The faster the skater moves the more kinetic energy he has.

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Help ASAP (Math) will give brainiest and points!!
nordsb [41]

Answer:

2.17 \times 10^{-1}

Step-by-step explanation:

(7 \times 10 ^{-6}) + 0.26 - (5 \times 10^{-2}) = \frac{7}{10^3} + \frac{26}{10^2}-\frac{5}{10^2}

                                              = \frac{7 + (26 \times 10) - ( 5 \times 10)}{10^3}\\\\=\frac{7 + 260 - 50 }{10^3}\\\\=\frac{217}{10^3}\\\\= 2.17 \times 10^2 \times 10^{-3}\\\\= 2.17 \times 10^{-1}

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U need to ask a teacher
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3 years ago
A study claims that college students spend an average of 4 hours or less studying per day. A researcher wants to check if this c
kirill115 [55]
<h2>Answer with explanation:</h2>

Let \mu be the population mean.

By observing the given information, we have :-

H_0:\mu\leq4\\\\H_a:\mu>4

Since the alternative hypotheses is left tailed so the test is a right-tailed test.

We assume that the time spend by students per day is normally distributed.

Given : Sample size :  n=121 , since n>30 so we use z-test.

Sample mean : \overline{x}=3.15

Standard deviation : \sigma=1.2

Test statistic for population mean :-

z=\dfrac{\overline{x}-\mu}{\dfrac{\sigma}{\sqrt{n}}}

\Rightarrow\ z=\dfrac{3.15-4}{\dfrac{1.2}{\sqrt{121}}}\\\\\Rightarrow\ z=-7.79166666667\approx-7.79

Critical value (one-tailed) corresponds to the given significance level :-

z_{\alpha}=z_{0.1}=1.2816

Since the observed value of z (-7.79) is less than the critical value (1.2816) , so we do not reject the null hypothesis.

Hence, we conclude that we have enough evidence to accept that the college students spend an average of 4 hours or less studying per day.

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3 years ago
F(x) = -4x2 – x - 3<br> Find f(1)
nadezda [96]

Answer:

-8

Step-by-step explanation:

-4 (1)^2 -(1) -3

-4-1-3=-8

5 0
2 years ago
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What is the vertex of the quadratic function?
Debora [2.8K]

Answer:

f(x) = x² - 4x - 12

Step-by-step explanation:

f(x) = (x - 6)(x + 2)

f(x) = x² + 2x - 6x - 12

f(x) = x² - 4x - 12

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