The slope of a line connecting two points on a velocity versus time graph gives
A) displacement.
B) instantaneous velocity.
C) average velocity.
D) instantaneous acceleration.
E) average acceleration.
E
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An aluminum cantilever beam (E 5 72 GPa) with a square cross section and span length L 5 2.5 m is sub- jected to uniform load q 5 1.5 kN/m. The allowable bending stress is 55 MPa. The maximum deflection of the beam is approximately:
(A) 10 mm
(B) 20 mm
(C) 30 mm
(D) 40 mm
The first step in the proton-proton chain produces an antielectron, or positron. What happens to the positron?
A) It slowly works its way to the Sun's surface, where it escapes into space. B) It rapidly escapes from the Sun, traveling into space at nearly the speed of light. C) It is rapidly converted to energy when it meets an ordinary electron, resulting in matter-antimatter annihilation. D) It quickly meets an ordinary electron, forming an electron-positron pair that remains stable. E) It joins with a nearby neutron to form a proton.
A thin ribbon of a silver alloy 2.00-cm wide and 0.0150-mm thick carries a current of 6.98 A perpendicular to a magnetic field. The Hall voltage is found to be 1.24 × 10^?4 V when the magnetic field is 2.50 T. Calculate n, the number of charge carriers per cubic meter
A solid wood door, 90.0 cm wide by 2.00 m tall has a mass of 35.0 kg. It is open and at rest
A small 500-g ball is thrown perpendicular to the door with a speed of 20.0 m/s and hits the door 60.0 cm from the hinged side. The ball rebounds with a speed of 16.0 m/s along the same line. What is the angular speed of the door just after the collision with the ball? A) 0.127 rad/s B) 0.925 rad/s C) 1.14 rad/s D) 2.28 rad/s E) 4.57 rad/s