On and Motion Graphs: Mastery Test 3
Select the correct answer.
Which pair of sentences is describing the same velocity?
OA. A car is parked. A car is moving in circles.
OB. A bus drives 40 miles per hour north. A truck drives 50 miles per hour north.
OC. A boy walks east at 6 kilometers per hour. A girl walks west at the same speed as the boy.
OD. Valerie rides her bike south at 8 kilometers per hour. Owen jogs south at 8 kilometers per hour.
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speed

ratio of distance traveled to time interval

net force

vector sum of forces on object

object

source of diverging light rays either luminous or illuminated

don't remove my answer im trying my best to answer them

explanation:

see the picture for the vector

the magnitude of the vector by pythagorean theorem

r = √( (-10)^2 + (3)^2 ) = √109

magnitude = √109 units

the direction angle between vector and x-axis is

tan^(-1)(3/10) = 16.699

so the direction is approximately 16.7 degrees north of west

force is based upon mass and acceleration.the statement is not always true.

it can be explained from newton's second law of motion.

as per newton's second law of motion the rate of change of momentum is directly proportional to the applied force and takes place along the direction of force.

mathematically it can be written as -

                                              ⇒      

here   k is the proportionality constant whose value is 1.

                                                            [a is the acceleration=dv/dt]

hence we see that force not only depends on mass and acceleration but also on velocity and rate of change of mass. force f will depend on mass and acceleration only when mass is constant.

hence the statement that force is based upon mass and acceleration is false.