Ideal Gas Law: How many moles are there in 2.00 kg of copper? The atomic weight of copper is 63.5 g/mol and its density is 8.90 g/cm3.
A. 15.3
B. 31.5
C. 51.3
D. 53.1
Answer: B
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The Doppler technique can be used to estimate the semimajor axis of a planet's orbit by
A) measuring the time it takes for the star's line-of-sight velocity to cycle from peak to peak, and using Newton's version of Kepler's Third law. B) measuring the speed at which the star orbits the mutual center-of-mass of the star and planet, and using Newton's theory of gravity. C) measuring the asymmetries in the velocity curve. D) measuring the amount by which the starlight is reduced when the planet transits.
Two long parallel wires that are 0.30 m apart carry currents of 5.0 A and 8.0 A in the opposite direction. Find the magnitude of the force per unit length that each wire exerts on the other wire and indicate if the force is attractive or repulsive
(?0 = 4? × 10-7 T ? m/A) A) 2.7 × 10-5 N repulsive B) 7.2 × 10-5 N repulsive C) 3.4 × 10-5 N attractive D) 2.7 × 10-5 N attractive E) 7.2 × 10-5 N attractive
In their attempt to gauge the true shape of our Galaxy, the Herschels concluded that:
A) our Galaxy has a hexagonal shape. B) the Sun is the only luminous star in our Galaxy. C) the Sun and Earth are near the edge of our Galaxy. D) our Galaxy has some noticeable holes lacking stars around its edges.
A simple pendulum of length 1.87 m has a mass of 120 g attached. It is drawn back 38.0° and then released. What is the maximum speed of the mass?
a. 1.44 m/s b. 3.93 m/s c. 2.74 m/s d. 2.79 m/s e. 0.249 m/s