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3 years ago

A dog exerts a force of 30N to move a wagon 2m in 5s. What is the power of the dog

Physics

1 answer:

Hunter-Best [27]3 years ago

6 0

Explanation:

power=f×v. recall= distances/ time

= f× d/t

= 30 × 2/5

=12watt

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Let A^=6i^+4j^_2k^ and B= 2i^_2j^+3k^. find the sum and difference of A and B

andreyandreev [35.5K]

Explanation:

Let $\textbf{A} = 6\hat{\textbf{i}} + 4\hat{\textbf{j}} - 2\hat{\textbf{k}}$ and $\textbf{B} = 2\hat{\textbf{i}} - 2\hat{\textbf{j}} + 3\hat{\textbf{k}}$

The sum of the two vectors is

$\textbf{A + B} = (6 + 2)\hat{\textbf{i}} + (4 - 2)\hat{\textbf{j}} + (-2 + 3)\hat{\textbf{k}}$

$= 8\hat{\textbf{i}} + 2\hat{\textbf{j}} + \hat{\textbf{k}}$

The difference between the two vectors can be written as

$\textbf{A - B} = (6 - 2)\hat{\textbf{i}} + (4 - (-2))\hat{\textbf{j}} + (-2 - 3)\hat{\textbf{k}}$

$= 4\hat{\textbf{i}} + 6\hat{\textbf{j}} - 5\hat{\textbf{k}}$

8 0

3 years ago

The main purpose of the turbine in the turbojet engine is to

AnnZ [28]

<span>The correct answer is A. drive the compressor. It's not D because the compressor compresses it, not the turbine. The temperature and the velocity of gasses are unrelated to this. There are in fact two turbines, and the first one gets power from exhaustion, which is then used to power to turbine in the turbojet that is used to drive the compressor. This is how turbojets commonly work.</span>

8 0

3 years ago

A cyclist is travelling at 4 metres per second for 100 metres,<br> how long does it take?

Slav-nsk [51]

Answer:

25 seconds!

Explanation:

I just had to find what number to multiply 4 to get 100 and it was 25

4x25=100

Or you could do the easier way by dividing 100 by 4 which has the same answer: 25

100÷4=25

7 0

4 years ago

Rank the band gap energies of the following solids. Metal insulator semiconductor superconductor I. large band gap energy II. sm

Anon25 [30]

Answer:

Metal - smallest band gap energy

insulators - large band gap energies

semiconductor - Band gap of intermediate energies

superconductor cooper pair theory is applied for calculating gap energies.

Explanation:

Metal - smallest band gap energy

it is due to the fact that valence and conduction bond in metal are in overlapped conditioned. Therefore showing zero gap energies

insulators - large band gap energies

insulator has high band gap

semiconductor - Band gap of intermediate energies

semi conductor has gap of intermediate range

while for superconductor cooper pair theory is applied for calculating gap energies.

5 0

4 years ago

Infrared telescopes are usually placed on high-flying airplanes or on satellites in space __________

Yuliya22 [10]

Answer:

In order to improve visibility

Explanation:

Infrared telescopes are made using infrared cameras that contain infrared detectors which are solid-state and are maintained at very cold (cryogenic) temperatures

Infrared radiation is absorbed by water vapor which is present in the Earth's atmosphere, leading to the limitation of the use of infra red telescopes at high altitudes such as mountains, high flying planes or satellites

3 0

3 years ago