What is the velocity of a beam of electrons that go undeflected when passing through crossed (perpendicular) electric and magnetic fields of magnitude 1.58×104V/m and 2.40×10−3T, respectively? me=9.11×10−31kg, e=1.60×10−19C. Express your answer to three significant figures and include the appropriate units.

Abatter hits the baseball a with an initial velocity of v0 = 110 ft/sec directly toward fielder b at an angle of 23° to the horizontal; the initial position of the ball is 2.2 ft above ground level. fielder b requires 0.44 sec to judge where the ball should be caught and begins moving to that position with constant speed. because of great experience, fielder b chooses his running speed so that he arrives at the “catch position” simultaneously with the baseball. the catch position is the field location at which the ball altitude is 8.4 ft. determine the velocity of the ball relative to the fielder at the instant the catch is made.

True or false when elements combine to form a mixture, the resulting chemical properties may be very different from those of the elements that make it.

Atomic nuclei of almost all elements consist of