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
C
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In a certain gas the molecules are 5.0 × 10?9 m apart on average, have a mean free path of 5.0×10?6 m, and have an average speed of 500 m/s. The rate at which a molecule has collisions with other molecules is about:
A. 10?11 s?1 B. 10?8 s?1 C. 1 s?1 D. 10^8 s?1 E. 10^11 s?1
One side of a normal outlet is at 120 V AC, the other side is at
A) -120 V AC. B) 0 V. C) 240 V. D) 120 V AC. E) +120 V AC.
What would a civilization within 60 light-years away be able to detect from Earth?
a. our first TV transmissions b. our cellular phone transmissions c. our production of machines that create noise d. our excessive carbon emissions e. our wireless Internet transmissions
As a proton moves in the direction the electric field lines
A) it is moving from low potential to high potential and gaining electric potential energy. B) it is moving from low potential to high potential and losing electric potential energy. C) it is moving from high potential to low potential and gaining electric potential energy. D) it is moving from high potential to low potential and losing electric potential energy. E) both its electric potential and electric potential energy remain constant.