A blob of material in outer space moves at 3 m/s when it collides and sticks to a half-as-massive blob initially at rest. Compared with the initial kinetic energy of the 3-m/s blob, the kinetic energy of the coupled blobs is
A) one-third.
B) two-thirds.
C) three-quarters.
D) not enough information
Answer: B
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A ball in the shape of a uniform spherical shell (like a soccer ball) of mass 1.5 kg and radius 15 cm rolls down a 35° incline that is 6.0 m high, measured vertically
The ball starts from rest, and there is enough friction on the incline to prevent slipping of the ball. (a) How fast is the ball moving forward when it reaches the bottom of the incline, and what is its angular speed at that instant? (b) If there were no friction on the incline, how fast would the ball be moving forward and what would be its angular speed at the bottom?
Nellie Newton pulls her sled by a rope that is 45° to the horizontal. The horizontal and vertical components of force are
A) equal in magnitude. B) each about 0.7 times the force she exerts on the rope. C) both of these D) neither of these
When 4 V of potential difference is applied across Resistor A, 2 A of current flows through it. When 4 V of potential difference is applied across Resistor B, 1 A of current flows through it. When 12 V is applied across Resistor A, 6 A flows through it, and when 12 V is applied across Resistor B, 3 A flows through it. Which of the following is consistent with this data?
1.Both resistors are not ohmic. 2.Resistor A is ohmic but Resistor B is not. 3.Resistor A is not ohmic but Resistor B is. 4.Both resistors are ohmic.
What type of spectrum is produced when a high energy electron beam is incident on a metal target producing X-rays?
A) line spectrum B) emission spectrum C) absorption spectrum D) continuous spectrum E) line spectrum superimposed on a continuous spectrum