The density of the Universe comes from baryonic matter, non-baryonic dark matter, and dark energy. What percentage of the density of the Universe do each of the three represent?
What will be an ideal response?
The density of the Universe comes from three different sources in ratios of approximately 5% for normal, baryonic matter; 25% for non-baryonic dark matter; and 70% for dark energy.
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A car travels counterclockwise around a flat circle of radius 0.25 km at a constant speed of 20 m/s. When the car is at point A as shown in the figure, what is the car's acceleration?
A. 1.6 m/s2, south B. Zero C. 1.6 m/s2, east D. 1.6 m/s2, north E. 1.6 m/s2, west
Resistor A has twice the resistance of resistor B. When individually connected across a given potential difference, which one dissipates the most power; and when connected in series across the same potential difference, which one dissipates the most power?
a. A, A c. A, B b. B, B d. B, A
The interior wall of a large commercial, walk-in type meat freezer is covered under normal operating conditions with a 2 cm thick layer of ice. One day, a power outage cuts electricity to the refrigeration system of the freezer. Estimate the time required to melt this layer of ice if it has mass density of 700 kg/m3 and latent heat of fusion of 334 kJ/kg. Consider the air temperature inside the freezer to be 200C with a heat transfer coefficient of 2 W/(m2 K) for convection from freezer surface to air, and clearly state the assumptions made in the calculations.
GIVEN
FIND
- Time required to melt the layer of ice
ASSUMPTIONS
- Steady state conditions prevail
- Radiative heat loss is negligible
Methane-rich atmospheric planets ______________ and ________________ probably formed closer to the Sun and migrated outward
a. Jupiter and Saturn b. Saturn and Uranus c. Uranus and Neptune d. Jupiter and Neptune