If the current density in a wire or radius R is given by J = kr, 0 < r < R, what is the current in the wire?
A) 2?kR3/3
B) 3?kR3/2
C) kR3/3
D) kR2
E) kR2/2
A
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A river has a steady speed of 0.30 m/s. A student swims downstream a distance of 1.2 km and returns to the starting point. If the student swims with respect to the water at a constant speed and the downstream portion of the swim requires 20 minutes, how much time is required for the entire swim?
A. 50 minutes B. 80 minutes C. 90 minutes D. 70 minutes E. 60 minutes
The zeroth law of thermodynamics pertains to what relational condition that may exist between two systems?
a. zero net forces c. zero temperature b. zero velocities d. thermal equilibrium
A stone is thrown horizontally from the top of a tower at the same instant that a ball is dropped vertically. Which object is traveling faster when it hits the level ground below?
A) Neither, since both are traveling at the same speed. B) It is impossible to tell from the information given. C) the ball D) the stone
How many elements make up the majority of Earth's continental crust?
What will be an ideal response?