A child is riding a merry-go-round which completes one revolution every 8.36 s. The child is standing 4.65 m from the center of the merry-go-round. What is the magnitude of the centripetal acceleration of the child?
A) 6.84 m/s2
B) 3.94 m/s2
C) 2.63 m/s2
D) 0.0664 m/s2
E) 0.696 m/s2
C
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Isothermal aging curves in Figure 7.17 show that peak yield strength at aging temperatures of 450°F (232°C) and 500°F (260°C) occurs in times of 100.6 hours (4 hours) and 10-0.6 hours (0.25 hours), respectively. Calculate the activation enthalpy for precipitate formation in this alloy.
What will be an ideal response?
All comets orbit the Sun in the same direction as the planets
Indicate whether the statement is true or false
A bowling ball size probe from a spaceship and a pebble size object land on a large asteroid that is far from any star. After a long period of time has passed, it is highly probable that the pebble and the probe
a. have each had the same change in temperature. b. have each had the same change in volume. c. are in thermal equilibrium with one another. d. are not in thermal equilibrium with one another. e. are in thermal equilibrium with one another, but are not at the same temperature.
How do astronomers test models of stellar evolution?
A. by measuring the number of stars in a cluster and comparing with the number predicted by the models B. by assuming that all the stars in our galaxy formed at the same time, and comparing with predictions of the models C. by recording the properties of a star over an extended period of time D. by comparing the paths in the H-R diagram predicted by models with the H-R diagrams of star clusters