A uranium atom traveling with a velocity of 5.00 x 105 m s-1 relative to the containing tube breaks up into Krypton and Barium. The Krypton atom is ejected directly backwards at a velocity of
2.35 x 106 m s- relative to the barium after separation. With what velocity does the barium atom move
F:
forward relative to the tube? What is the velocity of the Krypton atom relative to the containing
tube?(mass of Kr = 95.0; Ba = 140; U = 235)
Ans: 1.45 x 106 m s-1, 9.0 x 105 m s-1​

The speed of light in a material is 0.50 c. what is the critical angle of a light ray at the interface between the material and a vacuum?

(a) assume the equation x = at^3 + bt describes the motion of a particular object, with x having the dimension of length and t having the dimension of time. determine the dimensions of the constants a and b. (use the following as necessary: l and t, where l is the unit of length and t is the unit of time.) (b) determine the dimensions of the derivative dx/dt = 3at^2 + b. (use the following as necessary: l and t, where l is the unit of length and t is the unit of time.)

An object with initial temperature 130 ∘ f is submerged in large tank of water whose temperature is 50 ∘ f . find a formula for f ( t ) , the temperature of the object after t minutes, if the cooling constant is k = − 0.2 . remember newton's law of cooling (the rate of change of temperature with respect to time is equal to k times the difference between the temperature of the object and the surrounding temperature) ! : )