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3 years ago

Euglena are _______. A heterotrophs B autotrophs

Physics

1 answer:

zysi [14]3 years ago

6 0

The Euglena is unique in that it is both heterotrophic (must consume food) and autotrophic (can make its own food).

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An archer fires an arrow at a castle 230 m away. The arrow is in flight for 6 seconds, then hits the wall of the castle and stic

Vika [28.1K]

Answer:

(a). The initial speed of the arrow is 49.96 m/s.

(b). The angle is 39.90°.

Explanation:

Given that,

Horizontal distance = 230 m

Time t = 6 sec

Vertical distance = 16 m

We need to calculate the horizontal component

Using formula of horizontal component

$R =u\cos\theta t$

Put the value into the formula

$\dfrac{230}{6} = u\cos\theta$

$u\cos\theta=38.33$ .....(I)

We need to calculate the height

Using vertical component

$H=u\sin\theta t-\dfrac{1}{2}gt^2$

Put the value in the equation

$16 =u\sin\theta\times6-\dfrac{1}{2}\times9.8\times6^2$

$u\sin\theta=\dfrac{16+9.8\times18}{6}$

$u\sin\theta=32.06$ .....(II)

Dividing equation (II) and (I)

$\dfrac{u\sin\theta}{u\cos\theta}=\dfrac{32.06}{38.33}$

$\tan\theta=0.8364$

$\theta=\tan^{-1}0.8364$

$\theta=39.90^{\circ}$

(a). We need to calculate the initial speed

Using equation (I)

$u\cos\theta\times t=38.33$

Put the value into the formula

$u =\dfrac{230}{6\times\cos39.90}$

$u=49.96\ m/s$

(b). We have already calculate the angle.

Hence, (a). The initial speed of the arrow is 49.96 m/s.

(b). The angle is 39.90°.

5 0

3 years ago

The frequency of a wave is 2 Hz and the wavelength is 4 m. What is the wave speed?

mixer [17]

Answer:

4/2=2m/s

Explanation:

8 0

3 years ago

(a ) A 14 turns circular coil is placed on a paper which lies in 1.2 T magnetic field pointing inwards to the paper. The coil's

bonufazy [111]

(i) The direction of the current will be in opposite direction to the magnetic field.

(ii) The magnitude of the emf induced in the circuit is 0.359 V.

(iii) The induced current if the circular coil is 0.048 A.

b(i) The magnetic flux linkage through the coil is 1.41 x 10⁻⁴ Tm².

b(ii) The radius of the coil is r√3 m.

<h3>Direction of the current</h3>

The direction of the current will be in opposite direction to the magnetic field.

<h3>Emf induced in the circuit</h3>

Initial area of the coil = (πd²)/4

Initial area of the coil = (π x 0.225²)/4 = 0.0398 m²

Final area of the coil = (π x 0.072²)/4 = 0.001296 m²

$emf = \frac{NB(A_1 - A_2)}{t} \\\\emf = \frac{14 \times 1.2(0.0398 - 0.001296)}{1.8} \\\\emf = 0.359 \ V$

<h3>Induced current</h3>

I = emf/R

I = 0.359/7.5

I = 0.048 A

<h3>Magnetic flux linkage through the coil</h3>

Ф = LI

Ф = 0.015 x 0.0094

Ф = 1.41 x 10⁻⁴ Tm²

<h3>Radius of the coil</h3>

$L = \frac{\mu_o N^2\pi r^2}{l} \\\\r^2 = \frac{Ll}{\mu_o N^2\pi } \\\\r = \sqrt{\frac{Ll}{\mu_o N^2\pi } } \\\\r = \sqrt{\frac{0.015(l)}{4\pi\times 10^{-7} \times (420)^2 \pi } } \\\\r = 3 \sqrt{l} \ m$

where;

l is length of the coil

Learn more about inductance of coil here: brainly.com/question/17086348

3 0

3 years ago

Is snowflakes forming in a cloud a chemical or physical change

Elina [12.6K]

Answer:

Physical change.

A snowflake is still considered water whether its liquid or solid.

8 0

3 years ago

Read 2 more answers

Which type of friction force acts when there is no motion?

rosijanka [135]

Its called static friction.

3 0

4 years ago