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3 years ago

14

Who wants to do my missing physics work

1 answer:

kotegsom [21]3 years ago

4 0

Answer:

<h2>WHAT IF I HATE PHYSICS ?</h2>

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I need help plz and thank you this is do

love history [14]

Answer:

Oh I am sorry this is my first time on brainly i dont how to exit and sorry but dont know the answer

Explanation:

4 0

3 years ago

(b) The density of aluminum is 2.70 g/cm3. The thickness of a rectangular sheet of aluminum foil varies

vekshin1

Answer:

(i) $22.48 cm^3$

(ii) $1.5 mm$

Explanation:

Let t be the average thickness of the sheet.

Given that:

Density of the aluminum sheet is $2.70 g/cm^3$

Mass of sheet = 60.7 g

Length of sheet = 50.0 cm

Width of sheet = 30.0 cm

(i) Using, Density=Mass/Volume

$\Rightarrow \text{Volume}=\frac{\text{Mass}}{\text{Density}}$

$\Rightarrow \text{Volume}=\frac{60.7}{2.7}=22.48 cm^3$

Hence, the volume of the sheet is $22.48 cm^3$ .

(ii) Now, as this aluminum sheet is in the shape of a cuboid, so the volume of the sheet is

$\text{Volume}=\text{Length}\times\text{Width}\times\text{Thickness}$

$\Rightarrow 22.48=50\times 30 \times w$

$\Rightarrow w=\frac{22.48}{50\times 30}=0.015 cm$

Hence, the average thickness of the sheet is $1.5 mm$ .

6 0

4 years ago

A car and a train move together along straight, parallel paths with the same constant cruising speed v(initial). At t=0 the car

kogti [31]

Answer:

$t_1 = \frac{v_i}{a_i}$

$t_2 = \frac{v_i}{a_i}$

Δd = $v_it_1 = v_i^2/a_i$

Explanation:

As $v(t) = v_i + at$ , when the car is making full stop, $v(t_1) = 0$ . $a = -a_i$ . Therefore,

$0 = v_i - a_it_1\\v_i = a_it_1\\t_1 = \frac{v_i}{a_i}$

Apply the same formula above, with $v(t_2) = v_i$ and $a = a_i$ , and the car is starting from 0 speed, we have

$v_i = 0 + a_it_2\\t_2 = \frac{v_i}{a_i}$

As $s(t) = vt + \frac{at^2}{2}$ . After $t = t_1 + t_2$ , the car would have traveled a distance of

$s(t) = s(t_1) + s(t_2)\\s(t_1) = (v_it_1 - \frac{a_it_1^2}{2})\\ s(t_2) = \frac{a_it_2^2}{2}$

Hence $s(t) = (v_it_1 - \frac{a_it_1^2}{2}) + \frac{a_it_2^2}{2}$

As $t_1 = t_2$ we can simplify $s(t) = v_it_1$

After t time, the train would have traveled a distance of $s(t) = v_i(t_1 + t_2) = 2v_it_1$

Therefore, Δd would be $2v_it_1 - v_it_1 = v_it_1 = v_i^2/a_i$

8 0

3 years ago

What is mechanics? Give name of its two sub branch?

kap26 [50]

Answer:

Mechanics is the branch of physics which deals with the motion of objects its causes and effects.

Sub branches

kinematics(deals with motion of objects without studying the cause of its motion)

dynamic(deals with the motion and cause of motion of objects)

Explanation:

3 0

3 years ago

a motorcyclist is making an electric vest that, when connected to the motorcycle’s 12 v battery, will warm her on cold rides. sh

notsponge [240]

The length of copper wire this motorcyclist must use is equal to 8.56 meters.

<u>Given the following data:</u>

Voltage of the motorcycle, V = 12 V

Diameter of the copper wire, d = 0.25 mm

Current in the wire, I = 4.0 A

Radius, r = diameter/2 = 0.12.5 mm = 0.000125 m.

Resistivity of the copper wire, ρ = 1.72 × 10⁻⁸ Ω-m.

<h3>How to determine the resistance?</h3>

By applying Ohm's law, the resistance of this copper wire can be calculated by using this formula:

R = V/I

R = 12/4

Resistance, R = 3 Ohms.

Mathematically, the resistance of any conductor (wire) in terms of length is given by this formula:

Length = RA/ρ

Length = Rπr²/ρ

Length = [3 × 3.142 × (0.000125)²]/1.72 × 10⁻⁸

Length = 14.73 × 10⁻⁷/1.72 × 10⁻⁸

Length = 8.56 meters.

Read more on resistance and length here: brainly.com/question/13930397

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5 0

2 years ago