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4 years ago

What makes a submarine dive?

1 answer:

8 0

Letting water into its tanks, and letting it push air out, increases the density of the submarine. Once its density becomes greater than 1 (the density of the water it's floating in), it starts to sink.

The more water is let into the tanks, the greater the sub's density becomes, and the faster it sinks ... (it becomes more like a rock).

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A squirrel is trying to locate some nuts he buried for the winter. He moves 4.3 m to the right of a stone and dogs unsuccessfull

krek1111 [17]

Answer:

The total displacement from the starting point is 1.5 m.

Explanation:

You need to sum and substract, depending on the movement (to the right, sum; to the left, substract).

First, it moves 4.3 m right and return 1.1 m. So the new distance from the starting point is 3.2 m.

Second, it moves 6.3 m right, so the new distance is 9.5 m.

Finally it moves 8 m to the left, so 9.5 m - 8 m= 1.5 m.

Summarizing, at the end the squirrel is 1.5 m from its starting point.

8 0

4 years ago

Which example involves the transformation of chemical energy directly into light energy?

zimovet [89]

burning sodium or magnesium

8 0

3 years ago

The headlights of a typical truck are powered by a 12 V battery. What current do they draw if the resistance is 4.8 ohms?

vodomira [7]

Solve this using Olm's law, which relates current (C), voltage (V), and resistance (R). Olm's law says:
$I \: (current ) ={\frac {V \: (voltage) }{R\:(resistance)}}$

We are told that voltage, V = 12V, and resistance, R = 4.8 <span>Ω. Plug these values into the equation and solve for current:
</span> $I = \frac{V}{R}\\
I = \frac{12}{4.8}\\
I = 2.5A

$
<span>-----
Answer: Current = 2.5 Amperes</span>

6 0

4 years ago

Read 2 more answers

A positive point charge Q is fixed on a very large horizontal frictionless tabletop. A second positive point charge q is release

UNO [17]

Answer:

As it moves farther and farther away from Q, it's speed will keep increasing.

Explanation:

This is so because the point charges are both positive charges and positive charges repel.

As the charges repel, they do so at an increasing speed.

6 0

3 years ago

A cyclist has a constant speed of 12 m/s. What is the magnitude of the displacement of the cyclist after 18 seconds?

Katyanochek1 [597]

Answer:

216 m

Explanation:

Assuming a straight line:

Δx = vt

Δx = (12 m/s) (18 s)

Δx = 216 m

7 0

3 years ago