Explain why it would be better to obtain stellar parallax for stars if we could observe from the planet Mars instead of the Earth
What will be an ideal response?
Observing from Mars would give us a longer baseline in order to measure parallax angles. In addition, the blurring caused by Earth's atmosphere smears star images. Even when astronomers average together many observations, they cannot measure parallax from an Earth observatory with uncertainty greater than about 0.02 arc second from Earth. Measuring parallaxes from Marsh—above the blurring effects of Earth's atmosphere—would yield a more accurate estimation.
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Indicate whether the statement is true or false
A 20.0 kg mass is attached to the end of a 1.00 m steel rod with a 1.00 mm diameter. If the tensile modulus of steel is 
then the frequency of the simple harmonic motion of the mass is
A. 37.2 Hz. B. 30.4 Hz. C. 24.5 Hz. D. 20.1 Hz. E. 14.1 Hz.
If a current of 2.4 A is flowing in a cylindrical wire of diameter 2.0 mm, what is the average current density in this wire?
A) 7.6 × 105 A/m2 B) 5.2 × 10-6 A/m2 C) 1.9 × 105 A/m2 D) 3.6 × 105 A/m2 E) 21 × 10-6 A/m2
A major league pitcher is recorded as having thrown a 105 mph fastball. What is the speed of the pitch in m/s? One mile is equivalent to 1609m.
A. 15 m/s B. 235 m/s C. 47 m/s D. 34 m/s