The vast majority of stars in a newly formed star cluster are

A) less massive than the Sun.
B) very high-mass, type O and B stars.
C) red giants.
D) about the same mass as our Sun.


A) less massive than the Sun.

Physics & Space Science

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A concave mirror has radius R. When an object is located a distance 2R from the lens, which describes the image formed?

a. real, inverted, diminished b. real, inverted, enlarged c. virtual, upright, diminished d. real, inverted, of equal size

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When a diffraction grating having 5000 lines/cmis illuminated by monochromatic light, the angle between the central maximum and the fourth order maximum is 47.2°. What is the wavelength of the light?

A) 367 nm B) 183 nm C) 138 nm D) 637 nm

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How would the data be influenced by an increase of friction in the pulley?

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A 1.5-kg playground ball is moving with a velocity of 3.0 m/s directed 30° below the horizontal just before it strikes a horizontal surface. The ball leaves this surface 0.50 s later with a velocity of 2.0 m/s directed 60° above the horizontal. What is the magnitude of the average resultant force on the ball?

a. 14 N b. 11 N c. 18 N d. 22 N e. 3.0 N

Physics & Space Science