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3 years ago

2.Cars were previously manufactured to be as sturdy as possible, whereas today's cars

Physics

1 answer:

Marina CMI [18]3 years ago

4 0

Answer:

Crumple zones are designed to absorb and redistribute the force of a collision. ... Also known as a crush zone, crumple zones are areas of a vehicle that are designed to deform and crumple in a collision. This absorbs some of the energy of the impact, preventing it from being transmitted to the occupants.

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Jermaine and Lashonda each rub their dry hair with inflated balloons. While doing this, the other students notice that their hai

zaharov [31]

too much static electricity can cause a negative reaction such as the balloons repelling away from one another.

6 0

3 years ago

Read 2 more answers

An object of mass 20g taken at a height of 2m above the ground. Which type of energy is possessed by the object at this height ?

In-s [12.5K]

<h3><u>Given</u> </h3>

Mass of an object is $\bf\red{20 g}$
Height of the body is $\bf\green{2 m}$

Value of the energy

<h3><u>Solution</u></h3>

${\purple {\underline{\boxed{\sf{ Potential\: Energy \:=\: mgh}}}}}$

Where,

$\sf\red{m}$ = Mass
$\sf\green{g}$ = Gravity
$\sf\blue{h}$ = Height

Now, Converting gram to kg

$\longrightarrow\:$ 1000g = 1kg

$\longrightarrow\:$ 20g = $\sf\dfrac{20}{1000}$

$\longrightarrow\:$ = 0.02 kg

According to the question

$\sf\red{Mass \:= \:0.02 kg}$

$\sf\green{Gravitational \;force \:= \;10 m/s^{2}}$

$\sf\purple{Height\: =\: 2 m}$

Putting these values

$\to\:$ Potential Energy = mgh

$\to\:$ Potential Energy = 0.02 × 10 × 2

$\to\:$ Potential Energy = 0.2 × 2

$\to\:$ Potential Energy = $\bf\pink{0.4\:joules}$

7 0

3 years ago

A piece of wood that floats on water has a mass of 0.0175 kg. A lead weight is tied to the wood, and the apparent mass with the

crimeas [40]

Answer:

Specific gravity is 0.56

Explanation:

We know that

mass of water displaced by the wood is, m1( apparent mass when wood in air and lead is submerged in water) - m2(the apparent mass when wood and lead both are submerged in water)

= 0.0765 - 0.0452 = 0.0313 Kg

So the specific gravity of the wood is, = mass of wood / mass of water displaced by the wood

= 0.0175/0.0313

=0.56

5 0

4 years ago

Which states of matter have four substances

Black_prince [1.1K]

Answer:

Four states of matter are observable in everyday life: solid, liquid, gas, and plasma.

Explanation:

4 0

4 years ago

A parallel plate capacitor of capacitance Co has plates of area A with separation d between them. When it is connected to a batt

Alexxx [7]

Answer:

b. 1/2·C₀, 2·V₀

Explanation:

The capacitance on the parallel plate capacitor = C₀

The area of the plates = A

The voltage on the battery = V₀

The magnitude of the charge on the plate = Q₀

The new distance between the plates = 2·d

From an online physics source, we have;

$C_0 = \epsilon_0 \times \dfrac{A}{d}$

Where;

ε₀ = Constant

A = The area of the plates

With the new distance, 2·d, we get;

$C_{new} = \epsilon_0 \times \dfrac{A}{2\cdot d} = \dfrac{1}{2} \times \epsilon_0 \times \dfrac{A}{d} = \dfrac{1}{2} \times C_0$

Therefore;

$The \ new \ capacitance \ C_{new} = \dfrac{1}{2} \times C_0$

The potential difference, 'V', is given as follows;

$C = \dfrac{Q}{V}$

Therefore;

$V = \dfrac{Q}{C}$

Given that Q = Q₀, we get;

$V = \dfrac{Q_0}{\dfrac{1}{2} \times C_0} = 2 \times \dfrac{Q_0}{C_0} = 2 \times V_0$

∴ V = 2 × V₀

The new potential difference, V = 2·V₀

Therefore, after the plates are 2·d apart, the new capacitance and potential difference between the plates are;

1/2·C₀, 2·V₀.

3 0

3 years ago