What is the difference between velocity and speed?
A. There is no difference, they are both vectors.
B. Speed is a scalar and velocity is a vector.
C. Speed is a vector and velocity is a scalar.
D. There is no difference, they are both scalars.
B. Speed is a scalar and velocity is a vector.
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Elastic Collisions: In the figure, determine the character of the collision. The masses of the blocks, and the velocities before and after, are shown. The collision is
A. perfectly elastic. B. partially inelastic. C. completely inelastic. D. characterized by an increase in kinetic energy. E. not possible because momentum is not conserved.
147.5 ml of ethyl alcohol (coefficient of volume expansion 
at a temperature of 273.1 K is measured into a 150.0 ml glass beaker (whose coefficient of volume expansion is negligible by comparison). To what temperature does the beaker have to be warmed for it to be completely full (i.e. for the volume of the alcohol to reach 150.0 ml)?
A. 288.0 K B. 278.1 K C. 283.1 K D. 288.2 K
The rate of cratering
A) has remained constant over the last 4.6 billion years. B) has recently increased with more collisions in the asteroid belt. C) fluctuates over time, with massive bodies occasionally coming in from the Oort Cloud. D) shows that large asteroid impacts are more common now than in the past. E) shows that most interplanetary debris was swept up soon after the formation of the solar system.
Assuming muscles are 20% efficient, at what rate is a 60. kg boy using energy when he runs up a flight of stairs 10. m high, in 8.0 s?
What will be an ideal response?