The observable Universe changes with the usage of new and better telescopes like the current Hubble and the future James Webb

a. True
b. False
Indicate whether the statement is true or false


True

Physics & Space Science

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A mirror with a focal length 20 cm has a 4.0 cm tall object placed 100 cm in front of it. What is the position of the image?

A) 25 cm behind the mirror B) 20 cm behind the mirror C) 20 cm in front of the mirror D) 25 cm in front of the mirror E) 100 cm in front of the mirror

Physics & Space Science

A charge of 50-?C is placed on the y axis at y = 3.0 cm and a 77-?C charge is placed on the x axis at x = 4.0 cm. If both charges are held fixed, what is the magnitude of the initial acceleration of an electron released from rest at the origin?

a. 1.2 × 10^20 m/s2 b. 1.5 × 10^20 m/s2 c. 1.0 × 10^20 m/s2 d. 1.8 × 10^20 m/s2 e. 2.0 × 10^20 m/s2

Physics & Space Science

Which of the following could be the molecular formula for an alkene?

a. C9H9 b. C6H12 c. C9H17 d. C5H8 e. C2H6

Physics & Space Science

The temperature at which a liquid freezes is

A) affected by foreign ions. B) the same temperature at which its solid form melts. C) both of these D) neither of these

Physics & Space Science