As the rock in this figure falls after being dropped from a great height:
a. its speed increases until it reaches a constant value, but its acceleration decreases gradually to zero.
b. its speed continues to increase while its acceleration goes to zero.
c. both the speed and the acceleration increase.
d. its speed decreases while its acceleration continues to increase.
e. its speed slows to zero while its acceleration reaches a terminal value.
a
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A spring scale typically indicates the magnitude of the tension force exerted on its bottom hook. What will the scale read in each of the cases shown in the diagram?
A. 49 N
B. 98 N
C. 196 N
D. Other (specify)
Nellie hangs from a pair of ropes at an angle. Tension in the ropes depends on the
A) length of the ropes. B) angle of the ropes. C) both of these D) neither of these
Four amperes of current exist in the primary coil of a transformer. The voltage across the primary coil is 120 V. What is the power output of the secondary coil?
A) 30 W B) 120 W C) 480 W D) 960 W E) need more information
The result of a particle meeting its antiparticle will most likely be
A. the creation of a "black hole." B. the release of quarks contained in each particle. C. the creation of a new particle with twice the mass of the original particles. D. annihilation of the two particles and the release of photons.