The speedometer of a car indicates a constant speed of 30 miles per hour. From this we can say that the acceleration of the car is
1) zero.
2) nonzero.
3) can't really say.
This is because
4) no net force is acting on the car.
5) any reading (other than zero) on the speedometer indicates acceleration.
6) the car may be changing its direction.
Answer: 3, 6
You might also like to view...
Size of the Nucleus: If an atomic nucleus containing 64 nucleons has a mass density ?, what will be the expected mass density of a nucleus containing 512 nucleons?
A. ? B. 2? C. 4? D. 8? E. 16?
Doppler Effect: You are driving along a highway at 35.0 m/s when you hear the siren of a police car approaching you from behind at constant speed and you perceive the frequency as 1340 Hz. You are relieved that he is in pursuit of a different driver when he continues past you, but now you perceive the frequency as 1300 Hz. What is the speed of the police car? The speed of sound in air is 343 m/s.
A. 38.4 m/s B. 30 m/s C. 39.2 m/s D. 40.1 m/s E. 41.7 m/s
What form or forms of energy does a falling elastic ball have when it is at its most-squeezed position on the floor, before it begins to rebound [see figure above]?
A) Kinetic and gravitational and elastic B) Kinetic only C) Kinetic and elastic D) Gravitational only E) Elastic only
Draw the structural formula for glycine, the simplest amino acid