Dark energy is the name of the
a. force that lead to the inflationary period of the Universe.
b. five-dimensional space of the Universe.
c. force suspected to cause the current acceleration in the rate of expansion of the Universe.
d. one of the particles of dark matter related to WIMPs.
e. the force that holds the proton together.
c
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Almost all elements heavier than hydrogen and helium were made inside stars
Indicate whether the statement is true or false
Two resistors of values 6.0 and 12.0 W are connected in parallel. This combination in turn is hooked in series with an 8.0-W resistor and a 24-V battery. What is the current in the 12-W resistor?
a. 1.3 A c. 12 A b. 4.0 A d. 0.67 A
If a body's acceleration is doubled then the amount of force acting on the body had to _______
a. double b. halve c. stay the same d. None of the other choices are correct.
For what type of object is the period-luminosity relation used for determining distances?
A) RR Lyrae variables B) T Tauri variables C) Cepheids D) Cataclysmic variables E) Planetary nebulae