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3 years ago

Please help! this is timed!

Physics

2 answers:

sweet-ann [11.9K]3 years ago

7 0

Im pretty sure it is the first answer

Alik [6]3 years ago

5 0

Answer:

I'm positive that it is the first one. Sorry if it wrong.

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What is a concave lens?

ozzi

A concave lens is a lens that has at least one of its surfaces or both surfaces curved inwards. Due to this reason, this lens diverges the light that falls on it and hence is also called a diverging lens. The concave lens is thinner in the middle compared to its edges. These are used in flashlights, binoculars, telescopes, etc.
Please see attached image for reference.

5 0

3 years ago

A supply plane needs to drop a package of food to scientists working on a glacier in Greenland. The plane flies 110 m above the

zysi [14]

Answer:

The distance is 709.5 m.

Explanation:

Given that,

Speed = 150 m/s

Distance = 110 m

Suppose, How far short of the target should it drop the package?

We need to calculate the time

Using equation of motion

$s=ut+\dfrac{1}{2}gt^2$

$t^2=\dfrac{2s}{g}$

Where, g = acceleration due to gravity

t = time

Put the value into the formula

$t=\sqrt{\dfrac{2\times110}{9.8}}$

$t=4.73\ sec$

We need to calculate the distance

Using formula of distance

$d= vt$

Put the value into the formula

$d=150\times4.73$

$d=709.5\ m$

Hence, The distance is 709.5 m.

8 0

3 years ago

A garbage truck crashes head-on into a Volkswagen and the two come to rest in a cloud of flies. Which experiences the greater fo

Artist 52 [7]

The volkswagon experiences a greater force as it was hit by a larger object that had a larger mass than itself

8 0

3 years ago

Some hydrogen gas is enclosed within a chamber being held at 200^\ { C} with a volume of 0.025 \rm m^3. The chamber is fitted wi

vlada-n [284]

Answer:

The final volume is $0.039 m^3$

Explanation:

Initial temperature: $T1=200C$

Final temperature: $T2=200C$

Initial pressure: $P1=1.50 \times10^6 Pa$

Final pressure: $P2=0.950 \times10^6 Pa$

Initial volume: $V1=0.025m^{3}$

Final volume: $V2=?$

Assuming hydrogen gas as a perfect gas it satisfies the perfect gas equation:

$\frac{PV}{T}=nR$ (1)

With P the pressure, V the volume, T the temperature, R the perfect gas constant and n the number of moles. If no gas escapes the number of moles of the gas remain constant so the right side of equation (1) is a constant, that allows to equate:

$\frac{P_{1}V_{1}}{T_{1}}=\frac{P_{2}V_{2}}{T_{2}}$

Subscript 2 referring to final state and 1 to initial state.

solving for V2:

$V_{2}=\frac{P_{1}V_{1}T_{2}}{T_{1}P_{2}}=\frac{(1.50 \times10^6)(0.025)(200)}{(200)(0.950 \times10^6)}$

$V_{2}=0.039 m^3$

3 0

4 years ago

Describe why chemical bonding occurs. Give two examples of how<br> bonds can form.

Vladimir [108]

Explanation:

Chemical bonding results from attractive forces that joins chemical species.

Noble gases show no tendency to combine with themselves or with other kinds of atoms because of their completely filled outer energy levels.
The driving force for most interatomic bonding is the tendency to have completely filled outer energy levels just like the inert gases.
The stable configuration can be attained by losing or gaining of electrons or sharing of pairs of electrons.

Two examples of how bonds form:

Bonds can be formed by:

Losing and gaining of electrons to form electrovalent or ionic bonds.
Sharing of electrons to form covalent bonds.

Learn more:

Ionic bonds brainly.com/question/6071838

#learnwithBrainly

6 0

3 years ago