A dike that intrudes a bed of sedimentary rock is ______________ than the sedimentary rock
Fill in the blank(s) with correct word
younger
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If a force on an object is aimed perpendicular to the direction of the object's velocity, the force does
a. no work. b. positive work. c. negative work. d. any of the above.
Which of the following four objects has the least kinetic energy?
a. An object of mass m moving with speed 4v b. An object of mass 3m moving with speed 2v c. An object of mass 4m moving with speed v d. An object of mass 2m moving with speed 3v e. None of these; all four objects have the same kinetic energy.
As a 1.0-kg object moves from point A to point B, it is acted upon by a single conservative force which does -40 J of work during this motion. At point A the speed of the particle is 6.0 m/s and the potential energy associated with the force is +50 J. What is the potential energy at point B?
a. +72 J b. +10 J c. +90 J d. +28 J e. +68 J
A radioactive material initially is observed to have an activity of 1 600 decays/s. If six hours later it is observed to have an activity of 400 decays/s, what is its half-life?
a. six hours b. three hours c. twelve hours d. seven hours e. not enough information