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Physics
What can be observed only by observing its effects on gravity.1 dark matter 2.solar nebula 3.gas and dust 4.planetesimal
Savanna regions developed during the Triassic period. true or false
Which of the following is NOT a factor that affects the apparent brightness of a star as seen from Earth? A. how old the star is B. how big the star is C. how hot the star is D. how far away the star is
Which type of star is the sun? red giant black dwarf main-sequence black hole
To calculate the frequency of an electromagnetic wave, you need to know the speed of the wave and its a. wavelength. b. intensity. c. refraction. d. amplitude.
What is the only unit of measurement for light energy power?
When a hailstone is at a height of 2.00km it’s mass is 2.50g what is it’s potential energy?
An electron moves past a gold atom's nucleus, which comprises 79 protons and 118 neutrons. At a specific instant, the electron is 7.5 × 10^−9 m from the nucleus. (a) What is the magnitude of the electric force the nucleus exerts on the electron?
A blank reaction occurs when a substance, usually containing carbon, reacts with oxygen to produce energy in the form of heat and light.
Which action can cause an object to move or change its state of motion?
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