When the number of turns in a solenoid and its length are both doubled, the ratio of the magnitude of the new magnetic field inside to the magnitude of the original magnetic field inside is:
a. 0.25
b. 0.50
c. 1
d. 2
e. 4
C
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Energy Conservation With Nonconservative Forces: A 30-N stone is dropped from a height of 10 m and strikes the ground with a speed of 13 m/s. What average force of air friction acted on the stone as it fell?
A. 4.1 N B. 2.9 N C. 0.13 kN D. 7.2 N E. 1.2 N
Magnesium is the metal in a molar solution of Mg2+ ions with a reference electrode.
(a) What reactions take place at the electrodes? (b) What voltage is developed in the standard cell? (c) Calculate the Gibbs free energy change when 1 mole of magnesium dissolves into a standard solution through the reaction Mg?2e– + Mg2+ with a standard-reference electrode.
What prediction does general relativity make for pulsars in a binary system?
What will be an ideal response?
Which of the following could be a hypothesis for the function of the thick waxy coating of a pine needle
A. If the thick, waxy coating is destroyed, the pine needle will turn B. The thick, waxy coating prevents water loss C. What happens to the needle if the thick, waxy coating is brown. destroyed? D. The tree would feel cold without the thick, waxy coating