How does a rocket take off What is the upward force on itYour explanation should include an interaction diagram and free-body diagrams of the rocket and of the parcel of gas being exhausted.
Exhausted gases and a high upward force propel the rocket forward.
The rocket pushes the exhaust gases down.
The heated gases are pushing up against it.
According to Newton's third law, the two forces constitute a pair.
Because the force of the combustion products on the rocket is heavier of gravitational, the rockets accelerates upward.
Your forehead can withstand a force of about before fracturing, while your cheekbone can withstand only about . Suppose a baseball traveling at strikes your head and stops in
a. What is the magnitude of the force that stops the baseball?
b. What force does the baseball exert on your head? Explain.
c. Are you in danger of a fracture if the ball hits you in the forehead? On the cheek?
A woman living in a third-story apartment is moving out. Rather than carrying everything down the stairs, she decides to pack her belongings into crates, attach a frictionless pulley to her balcony railing, and lower the crates by rope. How hard must she pull on the horizontal end of the rope to lower a crate at steady speed?
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