Which of these is the best description of the action-reaction force pair after the space shuttle lifts off from the launch pad? a. the ground pushes the rocket up while exhaust gases push down on the ground b. exhaust gases push down on air while the air pushes up on the rocket c. the rocket pushes exhaust gases down while the exhaust gases push the rocket up d. gravity pulls the rocket exhaust down while friction pushes up against the atmosphere

The 5-kg cylinder is initially at rest when it is placed in contact with the wall b and the rotor at a. if the rotor always maintains a constant clockwise angular velocity v = 6 rad> s, determine the initial angular acceleration of the cylinder. the coefficient of kinetic friction at the contacting surfaces b and c is mk = 0.2.

Aknife blade is a(n) a. lever b. screw c. wedge d. inclined plane

Mass (kg) force (n) 5 25 10 50 15 75 20 100 a student was trying to find the relationship between mass and force. he placed four different masses on a table and pulled them using a spring scale. the table shows the different masses used in the experiment and the force required to pull each mass. the student concluded that more force was required to pull heavier objects. what comment would you make regarding his conclusion? a) no clear relation can be observed between mass and force from the data. b) there is a direct proportion between the mass and force listed in the table. c) gravity should have been taken into account while performing the experiment. d) there is an inverse proportion between the mass and force listed in the table.