Find the radius of a star image formed on the retina of the eye if the aperture diameter (the pupil) at night is 0.70 cm and the length of the eye is 3.0 cm. Assume the wavelength of starlight in the eye is 600 nm. (1 nm = 10-9 m)
a. 5.2 × 10^-4 m
c. 2.6 × 10^-6 m
b. 3.1 × 10^-6 m
d. 2.6 × 10^-4 m
B
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Projectile Motion: Enzo throws a rock horizontally with a speed of 12 m/s from a bridge. It falls for 2.28 s before reaching the water below with no appreciable air resistance. Just as the rock reaches the water, find(a) the horizontal component of its velocity.(b) the speed with which it is moving.
What will be an ideal response?
Currents in Earth's molten iron core create the planet's magnetic field. These currents are probably caused by
A. radioactivity and convection. B. rotational motion and radioactivity. C. rotational motion and convection. D. rifting and subduction.
The temperature of an ideal gas in a sealed 0.40-m3 rigid container is reduced from 350 K to 270 K. The final pressure of the gas is 60 kPA
The molar heat capacity at constant volume of the gas is 28.0 J/mol • K. The heat absorbed by the gas is closest to A) -24 kJ. B) -31 kJ. C) 24 kJ. D) 31 kJ. E) 0.00 kJ.
A person weighing 180 pounds stands on snowshoes. If the total area of the 2 snowshoes is 900 square inches, what is the pressure on the snow?