Answer: 10kg
Explanation:
force applied by Ahmad = 100 N
box's acceleration = 10 m/s
mass of the box = ?
Recall that Force is the product of mass of an object by the acceleration by which it moves.
i.e Force = mass x acceleration
100N = mass x 10m/s
Mass = 100N / 10m/s
Mass = 10kg
Thus, the mass of the box is 10kg
Tha atmosphere has no effect on gravity.
A. since the universe has no matter or energy on the outside
for the truck :
M = mass of the truck = 20000 kg
V = speed of truck = 110 km/h = 110 (km/h) (1000 m/1 km) (1 h/3600 sec) = 30.6 m/s
kinetic energy of truck is given as
KE₁ = (0.5) M V²
inserting the values
KE₁ = (0.5) (20000) (30.6)² = 9363600 J
for the astronaut :
m = mass of astronaut = 80 kg
v = speed of astronaut = 27500 km/h = 27500 (km/h) (1000 m/1 km) (1 h/3600 sec) = 7638.9 m/s
kinetic energy of astronaut is given as
KE₂ = (0.5) m v²
inserting the values
KE₂ = (0.5) (80) (7638.9)²
KE₂ = 2.33 x 10⁹ J
Ratio of kinetic energy of truck with kinetic energy of astronaut is given as
KE₁ /KE₂ = (9363600)/(2.33 x 10⁹)
KE₁ /KE₂ = 0.00402
kinetic energy of truck is 0.00402 time the kinetic energy of astronaut.
