Omar throws a rock down with speed 2.0 m/s from the top of a tower. The rock hits the ground after 2.0 s. What is the height of the tower? (air resistance is negligible)
a. 20 m
c. 44 m
b. 24 m
d. 63 m
B
Physics & Space Science
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For silver at a tensile stress of 300 MPa and a temperature of 200°C, what is the primary creep mechanism?
What will be an ideal response?
Physics & Space Science
A compass needle in a magnetic field
A) experiences a torque. B) experiences a pair of torques. C) may experience a pair of torques.
Physics & Space Science
Who discovered the electron in 1897?
a. Dalton b. Bohr c. Rutherford d. Thomson
Physics & Space Science
A solar cell has a light-gathering area of 10 cm2 and produces 0.2 A at 0.8 V (DC) when illuminated with S = 1 000 W/m2 sunlight. What is the efficiency of the solar cell?
a. 16% b. 7% c. 23% d. 4% e. 32%
Physics & Space Science