9. Olympic gold medalist Michael Johnson runs one time around the track - 400 meters - in 38 seconds. What is his displacement? What is his average velocity?
10. If an object is moving eastward and slowing down, then the direction of its velocity vector is .
a. eastward
b. westward
c. neither
d. not enough info to tell
11. If an object is moving eastward and slowing down, then the direction of its acceleration vector is .
a. eastward
b. westward
c. neither
d. not enough info to tell
12. Which one of the following quantities is NOT a vector?
a. 10 mi/hr, east
b. 10 mi/hr/sec, west
c. 35 m/s, north
d. 20 m/s
13. Which one of the following quantities is NOT a speed?
a. 10 mi/hr
b. 10 mi/hr/sec
c. 35 m/s
d. 20 m/s
14. Which one of the following statements is NOT true of a free-falling object? An object in a state of free fall .
a. falls with a constant speed of -10 m/s.
b. falls with an acceleration of -10 m/s/s.
c. falls under the sole influence of gravity.
d. falls with downward acceleration which has a constant magnitude.
15. The average speed of an object which moves 10 kilometers (km) in 30 minutes is .
a. 10 km/hr
b. 20 km/hr
c. 30 km/hr
d. more than 30 km/hr
Answers: 1
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The first law of thermodynamics states that heat added to a system is neither created nor destroyed but is transformed ⇒ as it changes into other forms of energy.
Answers: 1
Physics, 22.06.2019 00:30
Consider an ordinary, helium-filled party balloon with a volume of 2.2 ft3. the lifting force on the balloon due to the outside air is the net resultant of the pressure distribution exerted on the exterior surface of the balloon. using this fact, we can derive archimedes’ principle, namely that the upward force on the balloon is equal to the weight of the air displaced by the balloon. assuming that the balloon is at sea level, where the air density is 0.002377 slug/ft3, calculate the maximum weight that can be lifted by the balloon. note: the molecular weight of air is 28.8 and that of helium is 4.
Answers: 2
Physics, 22.06.2019 18:00
Gabby calls her cousin who lives in a different state and tells her to turn her radio to channel 98.7 so they can listen to their favorite song that is playing. her cousin turns her radio to 98.7, but does not hear the same song gabby hears. which most likely explains why?
Answers: 1
Physics, 23.06.2019 00:30
Two waves maximally constructively interfere at a point in space. among the options below, select the possible value of their phase difference at that point in space.a. zerob. πc. π/2d. not determinable by the information provided
Answers: 3
9. Olympic gold medalist Michael Johnson runs one time around the track - 400 meters - in 38 seconds...
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