3 years ago

Why can we still see craters on the moon even though they were formed by ancient meteor collisions?

1 answer:

8 0

Because there is no wind, snow, rain, sleet, blowing dust, hail,
or humidity on the moon to smooth them over and fill them in.
Without those things, we'd be able to see all the ancient meteor
collisions on Earth.

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Find out the speed of the car from home to school in meters per second.

julia-pushkina [17]

1.875

Explanation:

speed = distance moved ÷ time taken

7 0

3 years ago

Describe three important ways we use the electromagnetic spectrum in our everyday lives.

OlgaM077 [116]

Answer:

We use X-rays to help the injured, Radiowaves to communicate or entertain, and Visible light to see.

5 0

3 years ago

A 12 v automobile battery is connected to an electric starter motor. the current through the motor is 206

vampirchik [111]

Power = (voltage) x (current). The motor consumes (12)x(206)=2,472 watts. Some of it is dissipated as heat, but most of it is used to do useful work by turning the engine over to make it start.

5 0

3 years ago

What is the power generated by a 45 kg person who walks up a flight of 12 stairs, each 30 cm high, in 12 s?

Free_Kalibri [48]

The total distance covered by the person is 12 times the height of each stair:
$\Delta h=12 \cdot 30 cm=360 cm=3.60 m$

The work done by the person to climb the stairs is equal to the increase in his gravitational potential energy:
$W= \Delta U=mg \Delta h=(45 kg)(9.81 m/s^2)(3.60 m)=1589.2 J$

And therefore, the power generated by the person in 12 s is the work done divided by the time taken:
$P= \frac{W}{t}= \frac{1589.2 J}{12 s}=132.3 W$

So, the correct answer is B.

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4 years ago

What is the angle o in the triangle below? (Hint: Use an inverse trigonometric<br> function.)

Shalnov [3]

Answer:

D. 66.4

Explanation:

So this problem uses SOHCAHTOA or the three trig functions.

Specifically this uses cosine, because it has an adjacent and a hypotenuse.

First you would determine what to do on the calculator, and since the problem is saying so, use the inverse cosine button. This will give you a angle measure from the decimal.

On a calculator, type in cos^-1(6/15). I used 6/15 because cosine is adjacent over hypotenuse. This will give you 66.4, which is D on the answers.

5 0

4 years ago