4 years ago

Land masses that move on Earth are called: a. Continents b. Tectonic continents c. Tectonic plates d. Rock Masses

Physics

1 answer:

Andrew [12]4 years ago

7 0

Answer:

c. tectonic plates

Explanation:

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A firecracker in a coconut blows the coconut into three pieces. Two pieces of equal mass fly off south and west, perpendicular t

Lisa [10]

Explanation:

Let us assume that piece 1 is $m_{1}$ is facing west side. And, piece 2 is $m_{2}$ facing south side.

Let $m_{1} \text{and} m_{2}$ = m and $m_{3}$ = 2m. Hence,

$2mv_{3y} = m(21)$

$v_{3y} = \frac{21}{2}$

= 10.5 m/s

$2mv_{3x} = m(21)$

$v_{3x} = \frac{21}{2}$

= 10.5 m/s

$v_{3} = \sqrt{v^{2}_{3x} + v^{2}_{3y}}$

= $\sqrt{(10.5)^{2} + (10.5)^{2}}$

= 14.84 m/s

or, = 15 m/s

Hence, the speed of the third piece is 15 m/s.

Now, we will find the angle as follows.

$\theta = tan^{-1} (\frac{v_{3y}}{v_{3x}})$

= $tan^{-1}(\frac{10.5}{10.5})$

= $tan^{-1} (45^{o})$

= $45^{o}$

Therefore, the direction of the third piece (degrees north of east) is north of east.

5 0

4 years ago

Mary slides down a snow-covered hill on a large piece of cardboard and then slides across a frozen pond at a constant velocity o

Sophie [7]

Explanation is in the file

tinyurl.com/wtjfavyw

8 0

3 years ago

Why is information about comets, asteroids, and meteoroids important for understanding the development of the solar system?

ra1l [238]

It is important because in some way parts of meteoroids made earth which is a part of our solar sysytem

7 0

3 years ago

All electric devices are required to have identifying plates that specify their electrical characteristics. The plate on a certa

Elodia [21]

Answer:20ohms

Explanation:

According to ohms law, the current passing through a metallic conductor is directly proportional to the potential difference across its ends. Mathematically,

V = IR where;

V is the potential difference

I is the current

R is the resistance

Given current I that the iron carries = 6.0A

Voltage source (the Emf) = 1.2×10²V

resistance R = V/I

R = 120/6

R = 20ohms

Therefore the resistance of the steam iron is 20ohms

3 0

4 years ago

A river flows due east at 1.50 m/s. A boat crosses the river from the south shore to the north shore by maintaining a constant v

Ann [662]

Answer:

Explanation:

Given that the velocity of the river is 1.50m/s due east.

The velocity of the boat with respect to the river is 10.0 m/s due north .

The width of the river is 325 m.

Note that the velocity of the boat will help in crossing the river.

Hence, speed = distance/time

Speed = 10.0 m/s

Distance = 325 m

Time = ?

10 = 325/time

Time = 325/10

Time = 32.5s

Hence in 32.5s the horizontal distance traveled by boat will be

= 1.50m/s × 32.5s

= 48.75m

6 0

3 years ago