Newton's Second Law in 1 Dimension: During a hard stop, a car and its passengers slow down with an acceleration of 8.0 m/s2. What magnitude force does a 50-kg passenger exert on the seat belt in such a stop?
Fill in the blank(s) with the appropriate word(s).
400 N
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When a star collapses to half size, the gravitational field at its surface
A) doubles. B) quadruples. C) increases eightfold. D) remains constant.
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.
A straight 10-cm wire bent at its midpoint so as to form an angle of 90° carries a current of 10 A. It lies in the xy plane in a region where the magnetic field is in the positive z direction and has a constant magnitude of 3.0 mT. What is the magnitude of the magnetic force on this wire?
a. 3.2 mN b. 2.1 mN c. 5.3 mN d. 4.2 mN e. 6.0 mN
A Li2+ ion undergoes a transition from the n = 4 to the n = 3 state. The energy of the emitted photon is
a. 4.5 eV b. 10.2 eV c. 5.95 eV d. 2.6 eV e. 0.66 eV