As the wavelength of light increases, its energy ________.
A. decreases
B. remains constant
C. moves more slowly
D. increases
E. moves more quickly
Answer: A
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A Boeing-737 airliner has a mass of 30,000 kg. The total area of the wings is 100 m2 . What must be the pressure difference between the top and bottom of the wings to keep the airplane up?
a. 1960 Pa c. 7840 Pa b. 2940 Pa d. 15,700 Pa
Groombridge 34 is an M1 V star. Based on this information, which of the following are true? I. Groombridge 34 has a surface temperature that is less than the Sun. II. Groombridge 34 has a mass that is greater than that of the Sun. III. Groombridge 34 is less luminous than the Sun. IV. Groombridge 34 is located near the middle of the H-R diagram
a. I & II b. II & IV c. I & IV d. I & III e. II & III
A student wishes to build a telescope. She has available an eyepiece of focal length -5.0 cm. What focal length objective is needed to obtain a magnification of 10x?
What will be an ideal response?
Conservation of Momentum: In a police ballistics test, a 10.0-g bullet moving at 300 m/s is fired into a 1.00-kg block at rest. The bullet goes through the block almost instantaneously and emerges with 50.0% of its original speed. What is the speed of the block just after the bullet emerges?
A. 1.50 m/s B. 2.97 m/s C. 3.00 m/s D. 273 m/s