Answer: 6067.5 N
Explanation:
Work = Change in Energy. To start, all of the energy is kinetic energy, so find the total KE using: KE = 1/2(m)(v^2). Plug in 1980 kg for m and 15.5 m/s for v and get KE = 237847.5 J.
Now, plug this in for work: Work = Force * Distance; so, divide work by distance to get 6067.5 N.
Answer:
<u>A kangaroo hops 60 m to the east in 5 s. What is the kangaroo's average velocity? ... The kangaroo stops at a lake for a drink of water and then starts hopping again to the south. Each second, the kangaroo's velocity increases 2.5 m/s.</u>
Given:
5 kg
of coal
T1 =
20°C, T2 = 220°C
Required:
Q(heat
energy)
Solution:
The specific
heat of coal (bituminous) is 1.315 kJ/kg-K
Q =
mcp(T2-T1)
Q =
5kg (1.315 kJ/kg-K) (220 – 20)
Note
that T(°C) = T(K)
Q = 1315
kJ or 1315000 J
Since
1315000 J is close to 1314718 J, the
answer is letter <span>A.</span>
Answer:
d= 794.4 cmExplanation:
Given that
Speed ,V= 286 km/h
V=79.44 m/s
Given that time ,t= 100 ms
t= 0.1 s
We know that ( if acceleration is zero)
Distance = Speed x time
d= V t
Now by putting the values in the above equation
d = 79.44 x 0.1 m
d= 7.944 m
We know that 1 m = 100 cm
d= 794.4 cm