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4 years ago

When objects are heated they tend to expand because

1 answer:

5 0

Hello!
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When objects are heated, their molecules tend to vibrate fast. As they vibrate, the space between each atom increases. This keeps on happening, and the object expands until it has cooled down.
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Hope this helps! :)

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CONVERSIONS

Semmy [17]

Answer:

<h2><em><u>Is that question from class 10?</u></em></h2>

6 0

3 years ago

A supersonic airplane is flying horizontally at a speed of 2610 km/h.

Delvig [45]

Answer:

Centripetal acceleration of this aircraft: approximately $6.52\; {\rm m \cdot s^{-2}}$ .

Distance covered during the turn: approximately $63.2\; {\rm km}$ .

Time required for the turn: approximately $0.0242\; \text{hours}$ (approximately $87.2\; {\rm s}$ .)

Explanation:

Convert velocity and radius to standard units:

$\begin{aligned}v &= 2610\; {\rm km \cdot h^{-1}} \times \frac{1\; {\rm h}}{3600\; {\rm s}} \times \frac{1000\; {\rm m}}{1\; {\rm km}} \\ &= 725\; {\rm m\cdot s^{-1}} \end{aligned}$ .

$\begin{aligned} r = 80.5\; {\rm km} \times \frac{1000\; {\rm m}}{1\; {\rm km}} = 8.05 \times 10^{4}\; {\rm m}\end{aligned}$ .

Hence, the centripetal acceleration of this aircraft:

$\begin{aligned} a &= \frac{v^{2}}{r} \\ &= \frac{(725\; {\rm m\cdot s^{-1}})^{2} }{8.05 \times 10^{4}\; {\rm m}} \\ &\approx 6.53\; {\rm m \cdot s^{-2}}\end{aligned}$ .

The trajectory of the turn is an arc with a radius of $r = 80.5\; {\rm km}$ and a central angle of $\theta = 90^{\circ} = (\pi / 4)$ . The length of this arc would be:

$\begin{aligned} s &= r\, \theta \\ &= 80.5\; {\rm km} \times (\pi / 4) \\ &\approx 63.2\; {\rm km}\end{aligned}$ .

The time required to travel $63.2\; {\rm km}$ at a speed of $2610\; {\rm km \cdot h^{-1}}$ would be:

$\begin{aligned}t &= \frac{s}{v} \\ &\approx \frac{63.2\; {\rm km}}{2610\; {\rm km \cdot h^{-1}}} \\ &\approx 0.0242\; {\rm h} \\ &\approx 0.0242 \; {\rm h} \times \frac{3600\; {\rm s}}{1\; {\rm h}} \\ &\approx 87.2\; {\rm s} \end{aligned}$ .

6 0

2 years ago

Why is the international bureau of weight and measure established

Reptile [31]

Answer:

Explanation:

International Bureau of Weights and Measures (BIPM), French Bureau International des Poids et Mesures, international organization founded to bring about the unification of measurement systems, to establish and preserve fundamental international standards and prototypes, to verify national standards, and to determine standard units.

6 0

3 years ago

Read 2 more answers

A magnet can attract or repel another magnet from a distance true or false?

Anuta_ua [19.1K]

False the strength off the magnet lessens the farther you get from it

6 0

4 years ago

Read 2 more answers

A(n) 9.9 g bullet is fired into a(n) 138 g block of wood at rest on a horizontal surface and stays inside. After impact, the blo

kompoz [17]

Answer:

185.25 m/s

Explanation:

consider the motion of the combination of bullet and block after the collision

v₀ = initial speed just after the collision

v' = final speed = 0 m/s

μ = Coefficient of friction = 0.6

g = acceleration due to gravity = 9.8 m/s²

a = acceleration of the combination = - μ g = - (0.6) (9.8) = - 5.88 m/s²

d = stopping distance = 13 m

using the kinematics equation

v'² = v₀² + 2 a d

0² = v₀² + 2 (- 5.88) (13)

v₀ = 12.4 m/s

m = mass of the bullet = 9.9 g = 0.0099 kg

M = mass of the wood = 138 g = 0.138 kg

v = speed of bullet before collision

v₀ = speed of combination after the collision = 12.4 m/s

Using conservation of momentum

m v = (m + M) v₀

(0.0099) v = (0.0099 + 0.138) (12.4)

v = 185.25 m/s

3 0

3 years ago