Answer:
Explanation:
The radius of Earth is 
The density of an object is given by :
The density of Erth is, d = 5515 kg/m³
Where
m is the mass of the Earth
So,
Put all the values,
So, the mass of the Earth is equal to 
.
Answer:
0.02
Explanation:
Force, 
where N is normal reaction and coefficient of kinetic friction is 
. Also, N is equivalent to mg ie N=mg where m is mass of an object and g is acceleration due to gravity. Making 
the subject of the formula then
Substituting F with 2 N, m with 10 kg and g with 9.81 then
The force of the throw is an applied force
moving through the air is drag
and the downward pull would be due to gravity
Explanation:
Using equation of motion to determine the acceleration of the car,
vf^2 = vi^2 + 2 * a * S,
vf = 0
0 = vi^2 + 2 * a * S
Converting mph to m/s,
3 mph * 5280 ft/mi * 12 in/ft * 2.54 cm/in * 1 m/100 cm * 1 h/3600 s
= 3 * 0.445
v = 1.335 m/s
Converting in to m,
2 in * 2.54 cm/in * 1 m/100 cm = 0.0254 m
= 2 * 0.0254
S = 0.0508 m
0 = 1.335^2 + 2 * a * 0.0508
a = -1.335^2 ÷ 0.1013
= -17.54 m/s^2
Mass of car (assumed) = 2000 kg
Force = ma
= 2000 × 17.54
= 35.08 kN.
