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3 years ago

Which best describes a difference between energy transformations in power plants and dams?

Physics

2 answers:

9966 [12]3 years ago

6 0

Answer:A

Explanation:

VARVARA [1.3K]3 years ago

3 0

Answer:

only power plants use fossil fuels to transform energy

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If you walk 1.4 km north and then 4.8 km east, what are the magnitude and direction of your resultant displacement?

olchik [2.2K]

North and east are perpendicular directions hence we can use them as the basis of our coordinate system. The coordinates of this point can then simply be represented as

P = 1.4 N + 4.8 E (km)

The magnitude can be given by the right triangle formula :

P = $\sqrt{N^2 + E^2}$

= 5 km

Direction = atan(N/E) = 16.3 deg north of east = 73.7 deg east of north

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3 years ago

Suppose we take a 1 m long uniform bar and support it at the 21 cm mark. Hanging a 0.40 kg mass on the short end of the beam res

Ipatiy [6.2K]

Answer:

The mass of the beam is = 29 kg.

Explanation:

A beam with mass 40 kg is shown in figure. Point S is the support point. Point B is the middle point on the beam where mass of the beam acts.

Taking moment about Point S

40 × 21 = $M_{beam}$ × 29

$M_{beam}$ = 29 kg

Therefore the mass of the beam is = 29 kg.

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3 years ago

Which of the following is an example of uniform circular motion?

Allisa [31]

Answer:

C. A rocket traveling to the Moon

3 0

3 years ago

Read 2 more answers

A helix with 17 turns has height H and radius R. Charge is distributed on the helix so that the charge density increases like (i

marishachu [46]

The total charge on the helix is

Q = $\frac{221}{2}\sqrt{(\frac{H}{17})^2+(2\piR)^2$

Height of one turn = $\frac{H}{n}$

Horizontal distance in one turn = $2\pi R$

<h3>length of spring in one turn is</h3>

$l = \sqrt{h^2+(2\piR)^2}\\\\
l = \sqrt{(\frac{H}{n})^2+(2\piR)^2}
$

So, the total length of spring

$L = n*l\\\\
L = n * \sqrt{(\frac{H}{n})^2+(2\piR)^2}
$

Therefore, charge on spring

$Q = \frac{1}{2}*L*(13-0)\\\\
Q = \frac{1}{2}*n\sqrt{(\frac{H}{n})^2+(2\piR)^2}*13\\\\
Q = \frac{1}{2}*17*13\sqrt{(\frac{H}{17})^2+(2\piR)^2}\\\\
Q = \frac{221}{2}\sqrt{(\frac{H}{17})^2+(2\piR)^2\\\\
$

For more information on linear charge density, visit

brainly.com/question/15359786

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2 years ago

When the moon is between the earth and the sun what moon phase will this be

Aleksandr [31]

Answer: The new moon phase occurs when the Moon is directly between the Earth and Sun. A solar eclipse can only happen at new moon. A waxing crescent moon is when the Moon looks like crescent and the crescent increases ("waxes") in size from one day to the next. This phase is usually only seen in the west.

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3 years ago