Find the average density of a red giant star with a mass of 20 × 10^30 kg (approximately 10 solar masses) and a radius of 150 × 10^9 m (equal to the Earth's distance from the sun)
a. 1.41 × 10^-4 kg/m3
b. 0.007 kg/m3
c. 1.41 kg/m3
d. 710 kg/m3
e. 1.41 × 10^-3 kg/m3
E
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A 55-cm steel rod has a diameter of 30 cm. The compressive strength of steel is 500 × 106 N/m2. What is the compression force that would break the rod?
A) 3.5 × 107 N B) 2.4 × 107 N C) 1.4 × 108 N D) 4.7 × 108 N E) 8.9 × 108 N
What planet is this, and how do you know?
A) Saturn because of its colors and bright, wide rings B) Saturn because it is the only planet with rings C) Jupiter because it is the biggest planet and has the biggest rings D) Neptune because it has the brightest rings of any planet E) Jupiter because of its colors and bright, wide rings
When a nucleus of a given isotope decays, it
A. cannot produce a daughter with the same mass number. B. always produces a daughter with a lower mass number. C. cannot produce a daughter with a lower mass number. D. cannot produce a daughter with a higher mass number. E. always produces a daughter with a higher mass number.
Projectile Motion: An athlete competing in the long jump leaves the ground with a speed of 9.14 m/s at an angle of 35° above the horizontal. How long does the athlete stay in the air, assuming no significant air resistance?
A. 0.50 s B. 0.88 s C. 1.1 s D. 2.5 s E. 0.54 s