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vodka [1.7K]
3 years ago
8

Alicia drew a pentagon with equal side length and equal angles.Then she added red lines of symmetry to her drawing. How many lin

es did she draw?

Physics
1 answer:
IRISSAK [1]3 years ago
7 0
The sum of angles in a regular pentagon is
180*(5 - 2) = 540°
Each internal angle is 540/5 = 108°.

Each vertex creates a line of symmetry to the midpoint of the opposite side,
as shown in the figure.

Answer: 5 lines of symmetry.

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What is the proper function of a linkage? *
Kryger [21]

Answer:

a) transferring energy

Explanation:

A linkage is an assembly of parts connected together to control forces and movement. The connections between links are called joints and are used for ensuring movement, pure rotation or sliding.

Linkages provides a means in which kinetic energy is being transferred in different directions within a system. This Linkages can be used to Change force  direction, size of force applied or the motion created by the force.

6 0
3 years ago
A watermelon is blown into three pieces by a large firecracker. Two pieces of equal mass m fly away perpendicular to one another
Alenkinab [10]

Answer:

Speed of larger piece is \dfrac{V\sqrt{2}}{3}

Explanation:

We apply the principle of conservation of momentum.

The watermelon is initially at rest. The initial momentum = 0 kg m/s in all directions.

After the collision,

Vertical momentum = momentum of piece in y-direction + y-component of momentum of larger piece = mV + 3mv_{ly}

Here, v_{ly} is the y-component of velocity of larger piece.

This is equal to 0, since the initial momentum is 0.

v_{ly}=\dfrac{V}{3}

Horizontal momentum = momentum of piece in x-direction + x-component of momentum of larger piece = mV + 3mv_{lx}

Here, v_{lx} is the x-component of velocity of larger piece.

This is also equal to 0, since the initial momentum is 0.

v_{lx}=\dfrac{V}{3}

The velocity of the larger piece, v_l, is the resultant of v_{lx} and v_{ly}. Since they are mutually perpendicular,

v_l = \sqrt{v_{ly}^2+v_{lx}^2}= \sqrt{\left(\dfrac{V}{3}\right)^2+\left(\dfrac{V}{3}\right)^2}

v_l = \dfrac{V\sqrt{2}}{3}

3 0
3 years ago
The moon’s relative motion causes
Lerok [7]

Answer: Different cycles of the moon and ocean currents are all I can think of.

7 0
3 years ago
The Sun appears at an angle of 48.4° above the horizontal as viewed by a dolphin swimming underwater. What angle does the sunlig
Luden [163]

Answer:

4.57 degree

Explanation:

As the dolphin is under water, so the angle is angle of refraction which is equal to 48.4 degree.

refractive index of water, n = 1.333

Let the angle of incidence which is the angle between the incident ray and the normal is i.

By use of Snell's law

n = \frac{Sin i}{Sin r}

1.333 = \frac{Sin i}{Sin 48.4}

Sin i = 1.333\times Sin 48.4 = 0.9968

i = 85.43 degree

Angle made with the horizon = 90 - 85.43 = 4.57 degree

6 0
3 years ago
A coil consists of 200 turns of wire. Each turn is a square of side d = 18 cm, and a uniform magnetic field directed perpendicul
vampirchik [111]

Answer:

Induced emf in the coil, \epsilon=4.05\ volts

Explanation:

Given that.

Number of turns in the coil, N = 200

Side of square, d = 18 cm = 0.18 m

The field changes linearly from 0 to 0.50 T in 0.80 s.

To find,

The magnitude of the induced emf in the coil while the field is changing.

Solution,

We know that due to change in the magnetic field, an emf gets induced in the coil. The formula of induced emf is given by :

\epsilon=\dfrac{d\phi}{dt}

\phi = magnetic flux

\epsilon=-\dfrac{d(NBA)}{dt}

A is the ares of square

\epsilon=AN\dfrac{d(B)}{dt}

\epsilon=AN\dfrac{B_f-B_i}{t}

\epsilon=(0.18)^2\times 200 \times \dfrac{0.5-0}{0.8}

\epsilon=4.05\ volts

So, the induced emf in the coil is 4.05 volts. Hence, this is the required solution.

8 0
3 years ago
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