1. Two displacement vectors have magnitudes of 5.0 m and 7.0 m, respectively. Wh

Question

1. Two displacement vectors have magnitudes of 5.0 m and 7.0 m, respectively. When these two vectors are added, the magnitude of the sum

A) is 12 m.

B) is larger than 12 m.

C) could be as small as 2.0 m, or as large as 12 m.

D) is 2.0 m.

2. A stereo speaker plays music at a sound intensity level of 30 dB. If a second identical speaker plays the same music at the same time and same intensity level, the total sound intensity level will be:

A) 30 dB

B) 40 dB

C) 60 dB

D) none of these

3. A car goes around a curve of radius r at a constant speed v. What is the direction of the net force on the car?

A) there is no net force

B) toward the curve's center

C) away from the curve's center

D) toward the back of the car

4. An object moves with a constant speed of 20 m/s on a circular track of radius 100 m. What is the acceleration of the object?

A) 2.0 m/s2

B) 4.0 m/s2

C) 0.40 m/s2

D) zero

Explanation / Answer

1.option c ( if they are in opposite direction they get subtracted and if in same direction they get added)

2. none of the above

3. The net force always acts towards the centre of the circle if any oblect moves in circular(curve) track, named centripetal force, Option B

4. a= v^2/r = 20^2/100 = 4 m/s^2 , option B

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