A woman looking in a makeup mirror sees her face at twice its actual size and right-side up. If she is 22.0 cm from the mirror, what is its focal length?
a. 44.0 cm
c. 18.6 cm
b. 48.3 cm
d. 56.0 cm
A
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Scientific Notation: What is the result of the calculation (0.410 + 0.021) × (2.20 × 103)?
A. 880 B. 946 C. 948 D. 950
Halley's comet has an elliptical orbit around the Sun with a period of 76.0 years. At its closest approach (perihelion) it is 88.6 x 1010 m from the Sun and has a speed of 54.8 km/s
How far is it from the Sun at its furthest point (aphelion)? The mass of the Sun is 2.00 × 1030 kg and G = 6.67 x 10-11 N•m2/kg2. A) 12.8 × 1012 m B) 32.3 × 1012 m C) 5.42 × 1012 m D) 31.4 × 1012 m E) 52..3 × 1012 m
Which of the following statements are true about an object in two-dimensional projectile motion with no air resistance? (There could be more than one correct choice.)
A) The speed of the object is constant but its velocity is not constant. B) The acceleration of the object is +g when the object is rising and -g when it is falling. C) The acceleration of the object is zero at its highest point. D) The speed of the object is zero at its highest point. E) The horizontal acceleration is always zero and the vertical acceleration is always a non-zero constant downward.
Which of the following quantities is conserved for a planet orbiting a star in a circular orbit? Only the planet itself is to be taken as the system; the star is not included
a. Momentum and energy. b. Energy and angular momentum. c. Momentum and angular momentum. d. Momentum, angular momentum and energy. e. None of the above.