Suppose that an astronaut throws a rock in outer space at a location far from si

Question

Suppose that an astronaut throws a rock in outer space at a location far from significant influences of gravity and air resistance. One would expect that die rock would __________. eventually stop since all objects ultimately "lose their steam" continue in motion with the same speed and direction eventually stop as its inertia slowly becomes used up either a, b, or c - depending on whether the astronaut continues to push it A skydiver pulls the chord of his parachute. The forces acting upon the skydiver and his parachute are shown in the diagram at the right. From this diagram, one might infer that _______. The skydiver will immediately stop. The skydiver will begin moving upwards. The skydiver will have an acceleration that is directed upwards. None of these will occur A large truck rear-ends a less massive car at a stop sign. The force of the truck on the car is _________ the force of the car on the truck; the resulting acceleration of the truck is ______ the acceleration of the car. greater than, less than less than, greater than equal to, equal to equal to, less than greater than, equal to In terms of their definitions, an essential difference between velocity and speed is that ________. speed is a scalar and velocity is a vector velocity is a scalar and speed is a vector velocity is a large number and speed is a small number speed has a direction and velocity has no direction c. none of these If an object has an acceleration then it MUST be ________. changing its direction changing its speed changing its velocity none of these If you drop an object on Earth and ignore air drag, what is the object's speed and total distance fallen after 5.00 seconds? About 50 m/s and 250 m About 10 m/s and 50 m About 50 m/s and 125 m About 10 m/s and 250 m About 10 m/s and 125 m

Explanation / Answer

1) As there is no force acting on rock, it will continue to move with constant velocity, that is same speed and direction
option B

2) As net force is in upward direction, acceleration is in the upward direction.
option C

3) By newton's third law force applied by truck and car on each other is equal. As accelration is inversely proportional to mass, their accelerations are different.
Option D

4) option A is correct, by defination velocity is vector and speed is scalar quantity.

5) acceleration is change in velocity per unit time. if object is accelerating, it's velocity must be changing
option C

6) V = gt and S = 1/2 g t2
taking g= 10
V= 50 and S = 125 m
option C

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