The energy of one photon of light is related to wavelength (λ) of light using the equations: for green light with a wavelength of 454 nm, the energy (in joules) can be calculated using the following values: plank's constant (h) = 6.626 x 10-34 j*s speed of light (c) = 2.998 x 108 m/s wavelength (λ) = 454 x 10-9 m. calculate the energy (in j) of a green photon and enter your answer using three significant figures and exponential notation. (for example, 456000 would be entered as 4.56e5.)

The x-coordinate of a particle in curvilinear motion is given by x = 3.1t3 - 4.9t where x is in feet and t is in seconds. the y-component of acceleration in feet per second squared is given by ay = 2.3t. if the particle has y-components y = 0 and vy = 5.0 ft/sec when t = 0, find the magnitudes of the velocity v and acceleration a when t = 1.8 sec. sketch the path for the first 1.8 seconds of motion, and show the velocity and acceleration vectors for t = 1.8 sec. answers: v = ft/sec a = ft/sec2

The uniform slender bar rests on a smooth horizon- tal surface when a force f is applied normal to the bar at point a. point a is observed to have an initial acceleration aa of 20 m/s2, and the bar has a corre- sponding angular acceleration of 18 rad /s2. deter- mine the distance b.

Which of the following is a measure of the amount of light a star directly emits?               a.  luminosity    b.  intensity    c.  wavelength    d.  brightness