Question

26 27 28 The magnitude of the sum of two vectors whose lengths are 3 and 4 is A. always equal to 7. 3 less than or equal to 7. c always greater than 7. D. equal to 5. B Which one of the following is not a vector? A displacement B. speed c velocity D. acceleration Acceleration can be expressed in A m/s. B. m/s. cm/s D. m/s. Adding a displacement vector to another displacement vector results in A a velocity B. an acceleration ca scalar D. another displacement A force of 15.0 newtons eastward is applied to a cart having a mass of 4.60 kg. What will the acceleration be? A 4 m/s2 B. 3.26 m/s2 C. 69 m/s D. 0.307 m/s A car slows down experiencing a change in momentum of -7.50 x 10 Nos over a period of 3.70 s. What is the average force exerted on the car during this time? A.-27800 N B.-2030 N C. -27.8 N D. -2.03 N 29 30 31 If a person weighs 120. lb on Earth, how much would they weigh on the moon, where the force of gravity is only 1/6 as great? A 720. lb B. 10.0 kg C. 91.0N D. 20.0 lb

Answer 1

Answers:

25) B: less than or equal to 7

The magnitude of sum of two vectors $\vec{A}$ and $\vec{B}$ at angle $\theta$ is given by,

R= VAP + B2 + 2AB cos 0

Thus the maximum value is A+B and minimum value is A-B. So, the values are àlways less than or equal to 7.

26) B : speed

Speed is a scalr quantity while others are vector quantities.

27) C: $m/s^2$

The unit of acceleration is $m/s^2$

28) D: another displacement

Addition of two displacement vector gives a displacement vector.