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2 years ago

What determines who is the most important person

Physics

1 answer:

qwelly [4]2 years ago

5 0

Answer:

Putting your partner first means his or her needs, feelings, and wellbeing take priority over other people or things. A “sense of we” forms as you maintain this priority on purpose each day. You protect your relationship from being destroyed or damaged. You tend to your connection so it feels good to you b

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(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

3 years ago

Based on the graph of kinetic energy given (gray curve in the graphing window), sketch a graph of the baseball's gravitational p

chubhunter [2.5K]

1) Physical principles:

a) Total mechanical energy = kinetic energy + potential energy.

b) Total mechanical energy is conserved (neglecting external forces, like drag and friction)

2) Notation:

a) Total mechanical energy: ME.

b) Kinetic energy: KE

c) Gravitational potential energy: PE

∴ ME = KE + PE = constant

3) Solution:

a) Since, ME is conserved, it is constant and would be represented in the graph by a horizontal line.

b) At start (t = 0), the ball has only KE, so KE =ME = E and PE = 0

c) As the time goes, the ball gains altitude (PE increases) and loses speed (KE decreases).

d) PE increases from 0 to a maximum value. In the graph that happens at t = 2s.

At that point, KE = 0, and PE = ME.

That is the point of highest altitude and where the speed is zero.

d) From t = 2 seg, the ball starts to lose altitude, then the ball loses PE, and gains KE.

Just before reaching the ground, at t = 4s, the ball has the same initial KE and PE as at t = 0: KE = ME and PE = 0.

The PE may be sketched on the same graph along with the KE and the ME.

The graph is attached. The red line is the ME and the blue line is the PE.

Note that at any point in the graph PE + KE = ME.

5 0

3 years ago

Read 2 more answers

Hãy nêu sự tương tự giữa công của lực điện trong trường hợp này với công của trọng lực.

statuscvo [17]

Answer:

tốt ý bạn là gì?

Explanation:

6 0

3 years ago

Suppose all the people of the Earth go to the North Pole and, on a signal, all jump straight up. Estimate the recoil speed of th

Makovka662 [10]

Explanation:

It is known that relation between velocity and height is as follows.

v = $\sqrt{2gh}$

where, g = acceleration due to gravity = 9.8 $m/s^{2}$

h = height = 0.2 m

Therefore, velocity is calculated as follows.

v = $\sqrt{2gh}$

= $\sqrt{2 \times 9.8 \times 0.2}$

= 3.92 m/s

Also,

$m_{people}v_{people} = m_{earth}v_{earth}$

$v_{earth} = \frac{m_{people}v_{people}}{m_{earth}}$

Putting the given values into the above formula as follows.

$v_{earth} = \frac{m_{people}v_{people}}{m_{earth}}$

= $\frac{6 \times 10^{9} \times 74 kg/person}{6 \times 10^{24} kg}$

= $\frac{444 \times 10^{9}}{6 \times 10^{24}}$

= $74 \times 10^{-15}$ m/s

or, = $7.4 \times 10^{-14}$ m/s

Thus, we can conclude that recoil speed of the Earth is $7.4 \times 10^{-14}$ m/s.

4 0

3 years ago

If the graph shown is a position-time graph of an object moving at constant velocity, what is the velocity of the object? Assume

belka [17]

Answer:

C.) v = 50 m/s

Explanation:

The relationship between position vs. time graph and velocity is that the derivative (slope) of the position vs. time graph gives you velocity. In other words, find the slope to get the velocity.

Select two arbitrary points. I'll choose (3s, 225m) and (0s, 75m).

Now use the slope equation:

$v = \frac{y_{2} - y_{1} }{x_{2} - x_{1}} =\frac{225 - 75}{3-0} = 50 m/s$

v = 50 m/s

Hopes this helps!

5 0

3 years ago