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2 years ago

I need help with this question! Whoever answers gets brainliest and extra points! :)

Physics

1 answer:

Klio2033 [76]2 years ago

6 0

I am going to assume that the rider starts at rest. Using the equation for kinetic energy, the answer would be equivalent to $\frac{1}{2} (100)(11)^{2}$ . The final answer would be 50 N.

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Please answer!

Elden [556K]

I can confirm, your answer is 800J (Or 800 Joules)!

I just took the test and this was the correct answer :)

4 0

3 years ago

Read 2 more answers

The distance between Earth and Mars is 225 million km. When converted using the conversion factor 1 AU = 1.5 × 108 km, the dista

SIZIF [17.4K]

I guess the problem is asking for the distance between Earth and Mars in Astronomical Units (AU).

Since $1 AU = 1.5 \cdot 10^8 km$
and the distance between the two planets is
$d=225 mil. km= 2.25 \cdot 10^8 km$
we can convert this distance into AU by using the following proportion:
$1 AU : 1.5 \cdot 10^8 km = x : 2.25 \cdot 10^8 km$

from which we find
$x= \frac{1 AU \cdot 2.25 \cdot 10^8 km}{1.5 \cdot 10^8 km} =1.5 AU$

7 0

3 years ago

Read 2 more answers

A brass cube, 10 cm on a side, is raised in temperature

lana [24]

Answer:

$\delta L\%=22.5\%$

Explanation:

Assuming that the thermal expansion of brass cube occurs isotropically (i.e. equal in all the directions).

Given:

length of the cube, $l=10\ cm=0.1\ m$

change in temperature of the cube, $\Deta T=200\^{\circ}C$

coefficient of volume expansion, $\beta=57\times 10^{-6}\ ^{\circ}C^{-1}$

Hence volume of the cube:

$V=10^{-3}\ m^3$

Now the volume of the cube after expansion:

$\delta V=V.\beta.\Delta T$

$\delta V=10^{-3}\times 57\times 10^{-6}\times 200$

$\delta V=1.14\times 10^{-5}\ m^3$

Therefore,

$\delta L=0.0225\ m$

Now the percentage change in the edges of the cube:

$\delta L\%=\frac{\delta L}{L} \times 100$

$\delta L\%=\frac{0.0225}{0.1} \times 100$

$\delta L\%=22.5\%$

5 0

3 years ago

What is the relationship between frequency and wavelength?

mash [69]

Answer:

Frequency and wavelength are inversely proportional to each other. The wave with the greatest frequency has the shortest wavelength. Twice the frequency means one-half the wavelength. For this reason, the wavelength ratio is the inverse of the frequency ratio.

Explanation:

none

6 0

3 years ago

A 2.5g copper penny is given a charge of -4.0*10^-9c. how mny excess electrons are on the penny?

Lyrx [107]

Answer : The excess of electrons on the penny are, $2.5\times 10^{10}$ electrons

Solution : Given,

Total charge = $-4.0\times 10^{-9}C$

Charge on electron = $-1.6\times 10^{-19}C$

Formula used :

$\text{Excess of electrons}=\frac{\text{Total charge}}{\text{Charge of electron}}$

Now put all the given values in this formula, we get the excess of electrons present on the penny.

$\text{Excess of electrons}=\frac{\text{Total charge}}{\text{Charge of electron}}=\frac{-4.0\times 10^{-9}C}{-1.6\times 10^{-19}C/e^-}=2.5\times 10^{10}e^-$

Therefore, the excess of electrons on the penny are, $2.5\times 10^{10}$ electrons

7 0

3 years ago