As the distance between two objects increases, how does the force of gravity between them decrease
Answer: it decreases by the quare of the distance between them
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Cold-dark-matter models predict:
A) large-scale filaments containing both normal matter and dark matter. B) no structure on a smaller scale than superclusters. C) the universe is less than 10 billion years old. D) dense regions of the early universe that led to galaxies formed after decoupling. E) that dark matter is the largest component of the universe's density.
Based on our current theory of Earth's formation, the water we drink comes from
A) ice that condensed in the solar nebula in the region where Earth formed. B) chemical reactions that occurred in Earth's crust after Earth formed. C) chemical reactions that occurred in Earth's core after Earth formed. D) material left behind during the giant impact that formed the Moon. E) comets that impacted Earth.
Jake pulls on a 25-kg cart with a constant force of 50 N. What is the wagon's acceleration?
A) 0.2 m/s2 B) 2.0 m/s2 C) 5 m/s2 D) 20 m/s2 E) 200 m/s2
An astronaut in a rocket moving with a speed v = 0.6c relative to Earth performs a collision experiment with two small steel balls and concludes the both momentum and energy are conserved. What would an Earth observer conclude?
A. only momentum is conserved B. only energy is conserved C. neither energy or momentum is conserved D. both energy and momentum are conserved