kinematics

4. What will be the shape of the x→y

graph, if the relation between time and displacement of the moving body is t = 2αx2 where α is constant.

• (a) Circle

• (b) Straight line

• (c) Parabola

• (d) Hyperbola

. Which of the following statement is true if a body moves in a semicircular track whose radius is R

• (a) 2R is the displacement of the body

• (b) πR is the distance travelled by the body

• (c) Both (a) and (b) are correct

• (d) None of the above

What does the area under acceleration-time graph represent for any given time interval

• (a) Final velocity

• (b) Distance travelled

• (c) Change in the velocity in that time interval

• (d) Displacement of the particle

When can we say that the resultant of the two vectors is maximum

• (a) When the vectors are acting in the opposite direction

• (b) Both the vectors are acting in the same direction

• (c) When the vectors are at right angles

• (d) When the vectors are parallel to each other

A United Airlines jet is flying at 300 km/hr, while an Air France Concord is speeding along at 1200 km/hr Both airplanes are flying at the same altitude If each aircraft experiences problems with an unruly passenger, and they both decide simultaneously to push the passenger out the door, which of the unruly passengers will hit the earth first? (Ignore air resistance)

• The Air France passenger

• The United Airlines passenger

• Neither They will both hit the ground at the same time

• Impossible to determine The answer depends on which passenger is heavier

Assuming the airplanes in the previous problem continue to travel at the same velocity after ejecting their respective passengers, where will the passengers land with respect to their aircraft's path?

• When they hit the ground, they will be directly beneath the airplane they fell from

• When they hit the ground, they will be directly beneath the spot at which the airplane threw them out

• They will be in front of the aircraft they fell from

• It depends on which plane the passenger fell from

What kind of function is an acceleration function describing one-dimensional motion?

In general, the acceleration of objects due to the earth's gravitational pull is

Kinematics is concerned with

• understanding why objects move the way they do

• describing the movement of objects

• action at a distance

• None of the above

A raindrop on a drizzly day takes one minute from the time it leaves the cloud until it hits your umbrella, 3 miles below The average velocity of the raindrop on its journey is