An astronaut of mass 120 kg recedes from her spacecraft by activating a small propulsion unit attached to her back. The force generated by a spurt is 30 N. Show that her acceleration is 0.25 m/s2.

40) 40. An astronaut of mass 120 kg recedes from her spacecraft
by activating a small propulsion unit attached to her
back. The force generated by a spurt is 30 N. Show that
her acceleration is 0.25 m/s2.
42. Sophia exerts a steady 40-N horizontal force on a 8-kg
box resting on a lab bench. The box slides against a horizontal
friction force of 24 N. Show that the box accelerates
at 2 m/s2
44. A rocket of mass 100,000 kg undergoes an acceleration
of 2 m/s2. Show that the net force acting on it is
200,000 N
69. If it were not for air resistance, would it be dangerous to
go outdoors on rainy days? Defend your answer
Disscusion Question
98. On which of these hills does the ball roll down with
increasing speed and decreasing acceleration along the
path? (Use this example if you wish to explain to someone
the difference between speed and acceleration.)
99. If you drop an object, its acceleration toward the ground
is 10 m/s2. If you throw it down instead, will its acceleration
after leaving your hand be greater than 10 m/s2?
Ignore air resistance. Defend your answer.
100. Can you think of a reason why the acceleration of the
object thrown downward through the air in the preceding
question would actually be less than 10 m/s2?