In the metric mks system of units, the letter m stands for ______________
Fill in the blank(s) with correct word
meter
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Photography Optics: The focal length of the lens of a simple film camera is 40.0 mm. By what amount should the distance between the lens and the film be increased or decreased to change the focus from a person who is 25 m from the lens to one who is 4.0 m from the lens?
A. 0.2 mm B. 0.3 mm C. 0.4 mm D. 0.5 mm E. 0.7 mm
Astronomers use theory to determine the temperature of the Sun's core, because they cannot measure the core temperature directly.
Answer the following statement true (T) or false (F)
A 3.00-kg stone is dropped from a 39.2 m high building. When the stone has fallen 19.6 m, the magnitude of the impulse the Earth has received from the gravitational force exerted by the stone is
a. 9.80 N s. b. 19.6 N s. c. 29.4 N s. d. 58.8 N s. e. 118 N s.
A spaceship moving past the Earth with a speed of 0.800 c signals to the Earth with pulsed laser photons emitted at 10.0-second intervals according to the spaceship's clock. According to observers on Earth who see the flashes, the time interval they measure is
a. 13.4 s b. 16.7 s c. 12.5 s d. 9.70 s e. 6.03 s