The magnetic field of an electromagnetic wave has a peak value of 5.0 × 10-10 T. What is the intensity of the wave? (c = 3.0 × 108 m/s, c = 3.00 × 108 m/s, ?0 = 4? × 10-7 T ? m/A, ?0 = 8.85 × 10-12 C2/N ? m2)
A) 1.0 × 10-13 W/m2
B) 1.5 × 10-5 W/m2
C) 3.0 × 10-5 W/m2
D) 2.0 × 10-13 W/m2
E) 7.5 × 105 W/m2
Answer: C
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Two blocks in contact with each other are pushed to the right across a rough horizontal surface by the two forces shown. If the coefficient of kinetic friction between each of the blocks and the surface is 0.30, determine the magnitude of the force exerted on the 2.0-kg block by the 3.0-kg block
a.
15 N
b.
25 N
c.
11 N
d.
22 N
e.
33 N
The Oort Cloud is believed to have been formed by
A) planetesimals that were flung far from the Sun in gravitational encounters with the jovian planets. B) icy bodies formed between stars that have been captured by our solar system's gravity. C) moons that escaped from the jovian planets. D) debris from an icy planet that broke apart early in the solar system's history. E) debris from impacts of planetesimals, asteroids and comets with the jovian planets.
In an isothermal process for an ideal gas system (where the internal energy doesn't change), which of the following choices best corresponds to the value of the work done by the system?
a. its heat intake c. the negative of its heat intake b. twice its heat intake d. twice the negative of its heat intake
A pn-junction diode at 300 K produces a current density 1.00×104 A/m2 , with a forward bias of 0.10 V. Calculate the current density for a forward bias of 0.300 V.
What will be an ideal response?