An aluminum wire 2.0 m long and 2.0 mm in diameter supports a 10.0-kg fixture. What is the stress in the wire? Young's modulus for aluminum is 7.0 × 1010 N/m2
A) 9.3 × 107 N/m2 B) 3.1 × 107 N/m2 C) 6.2 × 107 N/m2 D) 1.2 × 108 N/m2
B
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Simple Pendulum: A spaceship captain lands on an unknown planet. Before venturing forth, he needs to find out the acceleration due to gravity on that planet. All he has available to him is some thin light string, a stopwatch, and a small 2.75-kg metal ball (it was a rough landing). So he lets the ball swing from a 1.5-m length of the string, starting at rest, and measures that it takes 1.9 s for it to swing from the place where he released it to the place where it first stops as it reverses direction. What is the acceleration due to gravity on this planet?
Fill in the blank(s) with the appropriate word(s).
Two objects are thrown from the top of a tall building and experience no appreciable air resistance. One is thrown up, and the other is thrown down, both with the same initial speed. What are their speeds when they hit the street?
A) The one thrown up is traveling faster. B) The one thrown down is traveling faster. C) They are traveling at the same speed.
What is an indication that a planetary moon may have been captured?
A) it revolves in retrograde direction, opposite to the direction of planetary spin B) it has a highly elliptical orbit C) it has an orbit which is inclined to the equator of the host planet D) all of these are indications
If the radiant energy from the sun comes in as a plane EM wave of intensity 1 340 W/m2, calculate the peak values of E and B
a. 300 V/m, 10-4 T b. 1 000 V/m, 3.35 × 10^-6 T c. 225 V/m, 1.60× 10-3 T d. 111 V/m, 3.00 × 10^-5 T e. 711 V/m, 2.37 × 10^-6 T