1. If you jog for 1 hour and travel 10 km, 10 km/h describes your________.
a. momentum
b. average speed
c. displacement
d. acceleration
2. ________ is speed in a certain direction.
a. acceleration
b.friction
c. momentum
d. velocity
3. Which of the following objects is not accelerating?
a. a ball being juggled
b.a woman walking at 2.5 m/s along a straight road
c.a satellite circling Earth
d. a braking cyclist
4. Automobile seat belts are necessary for safety because of a passenger's ___________.
a. Newton's first law
b. Newton's second law
c. air resistance
d. the law of gravity
2007-02-05 12:33:44 · 9 answers · asked by J 6 in Science & Mathematics ➔ Physics
1-b
2-d
3-b
4-a
To anyone who thinks "c" is the correct answer to no. 3...
To accelerate an object is to change its velocity, which is accomplished by altering either its speed or direction (as in the case of uniform circular motion) in relation to time. The Earth (and an orbiting satellite) is moving in a uniform circular motion. Therefore, it is altering its direction in relation to time. Therefore, it is indeed accelerating.
The woman, on the other hand, is walking at a constant speed (2.5 m/s) and not changing direction, therefore she is not accelerating.
2007-02-05 12:37:07 · answer #1 · answered by Q_142857 3 · 0⤊ 0⤋
1.= b
2.= d
3. = probably d. a woman walking a straight line at a constant speed is also right. A satellite circling Earth may, or may not accelerate.
4.= b
2007-02-09 11:20:18 · answer #2 · answered by 4-real 2 · 0⤊ 0⤋
1. b
2. d
3. c
4. a
Since I know that mine are correct, I wonder at the thumb down. A woman walking down a straight road at a given speed is much more likely to be accelerating her own motion to maintain speed depending on the incline, which is not given. A satellite in orbit does not move its arms about while it is traveling around the earth at a static speed. The Earth which is a satellite to the Sun, is not accelerating...
2007-02-05 12:39:58 · answer #3 · answered by freemichaelcampaign 2 · 0⤊ 1⤋
1)b
2)c
3)d
4)which ever law that says an object stays in motion until put at rest by an outside force.
2007-02-05 12:38:24 · answer #4 · answered by Anonymous · 0⤊ 1⤋
LOL! If you can't do these easy ones, you'll be in trouble as the semester progresses. Do yourself a favor and hit the books!
2007-02-05 12:38:22 · answer #5 · answered by Madkins007 7 · 2⤊ 0⤋
1. B
2. C
3. D
4. D
2007-02-05 12:39:57 · answer #6 · answered by Ralphie 5 · 0⤊ 1⤋
B, A, D, A??
i wanna know.. lol
2007-02-05 12:43:22 · answer #7 · answered by ♥~♥ 3 · 0⤊ 0⤋
b, d, b, a
2007-02-05 12:38:13 · answer #8 · answered by jmesmith 1 · 0⤊ 0⤋
b, c, d, b
2007-02-05 12:41:24 · answer #9 · answered by gianinni 2 · 0⤊ 0⤋