Contrast the probes dispatched by Galileo and Cassini in destinations
What will be an ideal response?
Galileo's probe fell into the atmosphere of Jupiter, to soon be destroyed by heat and pressure. Cassini's probe, built by the ESA, was sent into the atmosphere of Saturn's moon Titan.
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Two thin-walled concentric conducting spheres of radii 5.0 cm and 10 cm have a potential difference of 100 V between them
(k = 1/4??0 = 8.99 × 109 N ? m2/C2) (a) What is the capacitance of this combination? (b) What is the charge carried by each sphere?
Resolution: Suppose your telescope has perfect mirrors and is limited only by diffraction. If you are viewing with light of 400 nm wavelength, what diameter mirror in a space telescope would have 1.0-km resolution of objects on Mars when viewed from above the earth at a time when the Earth-Mars distance of 80 million kilometers?
A. 39 km B. 3.9 m C. 3.9 km D. 39 m E. 390 m
Is space expanding within clusters of galaxies? Why or why not?
A) no, because their gravity is strong enough to hold them together even while the universe as a whole expands B) no, because the universe is not old enough yet for these objects to have begun their expansion C) no, because expansion of the universe affects only empty space, not space in which matter is present D) Yes, and that is why clusters tend to grow in size with time.
Which of the following provided the first observational in support of the predicted existence of gravitational waves?
A) the orbit of a star system consisting of two neutron stars that is slowly decaying in a way consistent with energy being carried away by gravitational waves B) the energy generated by gravitational waves from the Sun that can be seen as it is absorbed by Jupiter C) gravitational waves detected by the Hubble Space Telescope D) photographs of spacetime that show the gravitational waves as ripples that are clearly visible