A car (of mass 1500 kg) and a small truck (of mass 2000 kg) collide suddenly at right angles at an icy intersection
The car was originally traveling eastward at 20.0 m/s and the truck was traveling northward at 20.0 m/s just before the collision took place. What is the speed of the combined wreck just after the collision if the vehicles become enmeshed?
14.3 m/s
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If the specific heat capacity of water were lower, ponds in the cold winter would be
A) more likely to freeze. B) less likely to freeze. C) neither more nor less likely to freeze.
Charge of uniform density (20 nC/m2) is distributed over a cylindrical surface (radius = 1.0 cm), and a second coaxial surface (radius = 3.0 cm) carries a uniform charge density of ?12 nC/m2 . Determine the magnitude of the electric field at a point 2.0 cm from the symmetry axis of the two surfaces
a. 2.3 kN/C b. 1.1 kN/C c. 1.7 kN/C d. 3.4 kN/C e. 4.5 kN/C
A beam of light falling on a metal surface is causing electrons to be ejected from the surface. If we now double the frequency of the light, which of the following statements are correct? (There could be more than one correct choice.)
A) The kinetic energy of the ejected electrons doubles. B) The speed of the ejected electrons doubles. C) The number of electrons ejected per second doubles. D) Twice as many photons hit the metal surface as before. E) None of the above things occur.
The alkali metals have ______________ valence electron(s)
Fill in the blank(s) with correct word