Quiz 2a (Phys 101 - 11.30am, Spring 2005)
a) In front of the car.
b) Behind the car
c) On top of the passenger (this is because both the rock and car have the same horizontal velocity)
d) Indeterminate as it depends upon how hard the passenger throws the rock.
a) What is his mass on Earth?
m = W/g = 600/10 = 60kg
b) What is his mass in space?
m = 60kg (i.e. it is unchanged in space)
a) What is the net force acting on the parachutist?
F(net) = W – F(air resistance) = 100x10 – 500 = 500N,down
b) What is the parachutist`s acceleration?
a = F(net)/m = 500/100 = 5m/s2, down