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80 : Space
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Gravity
Terms in this set (39)
Le cosmos
Cosmos
l'espace intersidéral
Outer space
une galaxie
a galaxy
Une comète
A comet
un cratère
a crater
Un astéroïde / une météorite
An asteroid / a meteorite
Une soucoupe volante / un Ovni
A flying saucer / a UFO
un trou noir
a black hole
Une année-lumière
A light year
Le système solaire
The solar system
La course à l'espace
The space race
un programme spatial
a space programme
La NASA
NASA
L'agence spatiale européenne
The European Space Agency
L'astronautique
Space science / astronautics
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Verified questions
ENGINEERING
A mass weighing 24 pounds, attached to the end of a spring, stretches it 4 inches. Initially, the mass is released from rest from a point 3 inches above the equilibrium position. Find the equation of motion.
ENGINEERING
The two identical steel frames with the dimensions are fabricated from the same bar stock and are hinged at the midpoints A and B of their sides. If the frame is resting in the position on a horizontal surface with negligible friction, determine the velocity v with which each of the upper ends of the frame hits the horizontal surface if the cord at C is cut.
ENGINEERING
Choose the letter of the answer that best completes the statement or answers the question. When backing while turning with a trailer, a. keep your eyes on the rearview mirror. b. steer using the top of the steering wheel. c. use the bottom of the steering wheel. d. use both hands at the 9:00 and 3:00 positions.
ENGINEERING
A double-glazed window consists of two panes of glass, each of thickness t=6 mm. The inside room temperature is $T_{i}=20^{\circ} \mathrm{C}$ with $h_{i}=7.7 \mathrm{W} / \mathrm{m}^{2} \cdot \mathrm{K}$, while the outside temperature is $T_{o}=-10^{\circ} \mathrm{C}$ with $h_{o}=25 \mathrm{W} / \mathrm{m}^{2} \cdot \mathrm{K}$. The gap between the glass sheets is of thickness L=5 mm and is filled with a gas. The glass surfaces may be treated with a low-emissivity coating to reduce their emissivity from $\varepsilon=0.95$ to $\varepsilon=0.05$. Determine the heat flux through the window for case 1: $\varepsilon_{1}=\varepsilon_{2}=0.95$, case 2: $\varepsilon_{1}=\varepsilon_{2}=0.05$, and case 3: $\varepsilon_{1}=0.05, \varepsilon_{2}=0.95$. Consider either air or argon of thermal conductivity $k_{\mathrm{Ar}}=17.7 \times 10^{-3} \mathrm{W} / \mathrm{m} \cdot \mathrm{K}$ to be within the gap. Radiation heat transfer occurring at the external surfaces of the two glass sheets is negligible, as is free convection between the glass sheets.
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