A plane stress element on a bar in uniaxial stress has a tensile stress of ?? 5 78 MPa (see fig.). The maximum shear stress in the bar is approximately:
(A) 29 MPa
(B) 37 MPa
(C) 50 MPa
(D) 59 MPa
(D) 59 MPa
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Fill in the blank(s) with correct word
Projectile Motion: A boy kicks a football with an initial velocity of 20 m/s at an angle of 25° above the horizontal. If we neglect air resistance, the magnitude of the acceleration of the ball while it is in flight is
A. 25 m/s2. B. 18 m/s2. C. 9.8 m/s2. D. 8.5 m/s2. E. 0 m/s2.
Bullet G is dropped, from rest, at the same time that another bullet H is fired horizontally from a rifle. If both bullets leave from the same height above the ground, then
A) bullet G hits the ground before bullet H does. B) both bullets hit the ground at the same time. C) bullet H hits the ground before bullet G does. D) not enough information is given to compare when they hit.
When viewing your image in a hand-held mirror, if you move the mirror away at a speed v, the image appears to:
a. also move away at v. c. move away at 2v. b. move away at v/2. d. not move.