Pulsars could not be pulsating stars because the pulses are too short
Indicate whether the statement is true or false
T
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Using the standard steam tables, calculate the coefficient of thermal expansion, ?, from its definition for steam at 450°C and pressures of 10 kPa and 1 MPa. Then compare your results with the value obtained by assuming that steam is a perfect gas and explain the difference.
GIVEN
• Steam
• Temperature = 450°C = 723 K
FIND
The coefficient of thermal expansion at 10 kPa and 10 MPa from
(a) Standard Steam tables
(b) Perfect Gas Law
PROPERTIES AND CONSTANTS
From steam tables
A certain spherical asteroid has a mass of 3.5 × 1016 kg and a radius of 8.8 km. What is the minimum speed needed to escape from the surface of this asteroid? (G = 6.67 × 10-11 N ? m2/kg2)
A) 23 m/s B) 16 m/s C) 520 m/s D) 730 m/s
Identify the FALSE statement. Differentiation of large planetesimals and protoplanets:
is the process by which these bodies develop internal layering. began with heating up component materials within these bodies. was caused by heat created by the transformation of kinetic energy from collisions into thermal energy. was inhibited if radioactive elements were present because their decay required heat input from the surroundings. resulted in a central ball of iron alloy (the core) and an outer shell of lighter rocky materials (the mantle.)
A current-carrying ohmic metal wire has a cross-sectional area that gradually becomes smaller from one end of the wire to the other. The current has the same value for each section of the wire, so charge does not accumulate at any one point. How does the resistance per unit length vary along the wire as the area becomes smaller?
1.It increases. 2.It decreases. 3.It remains constant.