What is the wavelength of a photon having the same momentum as an electron that is traveling at 7.5 km/s? (h = 6.626 × 10-34 J ? s, melectron = 9.11 × 10-31 kg)

What will be an ideal response?


97 nm

Physics & Space Science

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As the velocity of an inertial frame of reference increases with respect to a stationary observer, Einstein's theory of special relativity predicts that the length of an object, measured in the dimension parallel to the motion of the reference frame

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Three identical 6.0-kg cubes are placed on a horizontal frictionless surface in contact with one another. The cubes are lined up from left to right and a force is applied to the left side of the left cube causing all three cubes to accelerate to the right at 3.0 m/s2 . What is the magnitude of the force exerted on the right cube by the middle cube in this case?

a. 12 N c. 24 N b. 18 N d. none of the above

Physics & Space Science