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3 years ago

I need help please .

Physics

1 answer:

Likurg_2 [28]3 years ago

8 0

Answer:

option 5

Explanation:

because all u do is have to add them up

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An electromagnet requires 3 things. Select the 3 components below.

notsponge [240]

Answer:

A. Battery

B. Iron Core

C. Solenoid

6 0

4 years ago

A stone is dropped from a 75-m- high building . When this stone has dropped 15 m, a second stone is thrown downward with an init

patriot [66]

Answer: -17.66 m/s or 17.66 m/s downwards

Explanation:

The decribed situation is related to vertical motion and the main equation is:

$y=y_{o}+V_{o}t-\frac{1}{2}gt^{2}$ (1)

Where:

$y=0 m$ is the final height of both stones

$y_{o}=75 m$ is the initial height of both stone s

$V_{o}$ is the initial velocity of the stone

In the case of the first stone is $V_{o1}=0 m/s$ and for the second stone $V_{o2}$ is different from zero

$t$ is the time, which is the same for both stones

$g=-9.8 m/s^{2}$ is the acceleration due to gravity

Having this clear, let's find $t$ for the first stone:

$y=y_{o}+V_{o1}t-\frac{1}{2}gt^{2}$ (2)

$0=y_{o}+0-\frac{1}{2}gt^{2}$ (3)

Isolating $t$ :

$t=\sqrt{\frac{-2y_{o}}{g}}$ (4)

$t=\sqrt{\frac{-2(75 m)}{-9.8 m/s^{2}}}$ (5)

$t=3.912 s$ (6)

Now we have to use this time to find $V_{o2}$ :

$0=y_{o}+V_{o2}t-\frac{1}{2}gt^{2}$ (7)

Isolating $V_{o2}$ :

$V_{o2}=-\frac{y_{o}}{t} - \frac{gt}{2}$ (8)

$V_{o2}=-\frac{75 m}{3.912 s} - \frac{(-9.8 m/s^{2})(3.912)}{2}$ (9)

Finally:

$V_{o2}=-17.633 m/s$ (10) The negative sign indicates the direction of the initial velocity is vertically down

6 0

3 years ago

Which features form when magma cools beneath earths surface

Sholpan [36]

<h2>Answer:</h2>

<u>The features form when magma cools beneath earths surface are Volcanic necks and Dome mountains</u>

<h2>Explanation:</h2>

Volcanic Mountains are formed when molten rock (magma) deep within the earth, erupts, and after cooling it piles upon the surface. Similarly A volcanic plug, also called a volcanic neck or lava neck, is a volcanic object created when magma hardens within a vent on an active volcano. So these two are the features that are formed when magma cools beneath earths surface

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3 years ago

Una alberca cuyas dimensiones son 6 m 3 3m 3 1.5m esta llena de agua encuentra la masa del agua

Talja [164]

Answer:

Uga

Explanation:

5 0

3 years ago

Read 2 more answers

When blue light (450 nm) is shone on a particular metal surface, electrons are ejected with a kinetic energy of 2.5 x 10-20 J. C

Alex_Xolod [135]

Answer:

the work function of the metal is 4.167 x 10⁻¹⁹ J .

Explanation:

Given;

wavelength of the incident light, λ = 450 nm = 450 x 10⁻⁹ m

kinetic energy, K.E = 2.5 x 10⁻²⁰ J

The energy of the incident light is calculated as;

$E = hf = \frac{h c}{\lambda} \\\\where;\\\\c \ is \ speed \ of \ light = 3 \times 10^8 \ m/s\\\\ h \ is \ Planck's constant = 6.626 \times 10^{-34} Js \\\\E = \frac{(6.626 \times 10^{-34})(3\times 10^8)}{450 \times 10^{-9}} \\\\E = 4.417 \times 10^{-19} \ J$

Apply Einstein photoelectric equation to determine the work function of the metal;

E = W + K.E

where;

W is the work function of the metal

W = E - K.E

W = 4.417 x 10⁻¹⁹ J - 2.5 x 10⁻²⁰ J

W = 44.17 x 10⁻²⁰ J - 2.5 x 10⁻²⁰ J

W = 41.67 x 10⁻²⁰ J

W = 4.167 x 10⁻¹⁹ J

Therefore, the work function of the metal is 4.167 x 10⁻¹⁹ J .

8 0

3 years ago