Nearly all life on Earth passes on its heredity using
A) lipids
B) RNA
C) DNA
D) proteins
C
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A 1.0-kg object moving 9.0 m/s collides with a 2.0-kg object moving 6.0 m/s in a direction that is perpendicular to the initial direction of motion of the 1.0-kg object. The two masses remain together after the collision, and this composite object then collides with and sticks to a 3.0-kg object. After these collisions, the final composite (6.0-kg) object remains at rest. What was the speed of
the 3.0-kg object before the collisions? a. 15 m/s b. 10 m/s c. 5.0 m/s d. 20 m/s e. 25 m/s
If each copper atom in a wire were to contribute two conduction electrons instead of just one, its conductivity would
A. increase by a factor of 4. B. increase by a factor of 2. C. remain the same. D. decrease by a factor of 2. E. decrease by a factor of 4.
Ganymede is larger than Mercury, but it is not classified as a planet because it orbits Jupiter as opposed to the sun
Indicate whether the statement is true or false
A 4.0-kg mass attached to the end of a string swings in a vertical circle of radius 2.0 m. When the string makes an angle of 35° with the vertical as shown, the speed of the mass is 5.0 m/s. At this instant what is the magnitude of the force the string exerts on the mass?
a.
50 N
b.
82 N
c.
89 N
d.
11 N
e.
61 N