Answer:
Explanation:
mass, m = 1400 kg
height, h = 16 m
initial velocity, u = 21 m/s
final velocity, v = 13 m/s
Work done by engine, We = 80 kJ
Let the work done by the friction force is Wf.
Use the work energy theorem
net work done = change in kinetic energy
work done by engine + work done by friction force + work done by the gravitational force = Change in kinetic energy
80000 + Wf - m x g x h = 0.5 m ( v² - u²)
80000 + Wf - 1400 x 9.8 x 16 = 0.5 x 1400 x ( 169 - 441 )
- 139520 + Wf = - 190400
Wf = 50880 J
I think the correct answer is C.
An eclipse i believe is the answer?
A rock would be defined as specks of the earths crust formed over years of pressure and hot temperatures. They are mostly filled with minerals and and other components. A boulder would be defined as a large detached mass of rock. A boulder would fall in-between the largest rock on the mountain and the smallest. So technically a boulder is formed through a giant mass of earth that stays connected as it detaches itself from whatever, a rock would just be small pieces of it.
Answer:
10. m/s
Explanation:
Given:
y₀ = 3.1 m
y = 0 m
a = -9.8 m/s²
t = 2.4 s
Find: v₀
y = y₀ + v₀ t + ½ at²
0 m = 3.1 m + v₀ (2.4 s) + ½ (-9.8 m/s²) (2.4 s)²
v₀ = 10.47 m/s
Rounded to two significant figures, the student's initial velocity was 10. m/s.
