The most common kinds of stars are low-luminosity stars

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


True

Physics & Space Science

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To turn 50 grams of boiling water to steam requires

A) 50 calories. B) 500 calories C) 540 calories. D) more than 540 calories. E) none of the above

Physics & Space Science

The electron gun in a television tube accelerates electrons (mass = 9.11 × 10^-31 kg, charge = 1.60 × 10^-19 C) from rest to 3.00 × 10^7 m/s within a distance of 2.00 cm. What electric field is required?

Physics & Space Science

Determine the mass flow rate of R-134a required for steady state of the cross-flow heat exchanger shown. Air at 30ºC enters at a rate of 3.6 kg/s and leaves at 10ºC. The refrigerant enters at -10ºC, leaves at 5ºC, and has a specific heat of 2.1 kJ/kg?K.

Physics & Space Science

Explain why leaves and plants are the colors they are, not black or white

What will be an ideal response?

Physics & Space Science