Answer:
Two or more simple machines work together to form a complex machine. Compound machines can do more difficult jobs than simple machines alone. Examples of complex machines are bicycle, wheel barrow, crane, car jack, lawn mover
Explanation:
Answer:

Explanation:
As per ideal gas law we know that
PV = nRT
so we have


T = 200 K
now we have


Now we know that if pressure remains constant



Now work done in this process is given as



Answer:
A
Explanation:
option A is correct
the best example of elastic collision among the following is collision between two billiard balls. In collision of two billiard balls the energy lost is very little approximately zero. hence we can say that the kinetic energy is conserved. since, the kinetic energy is conserved we can say that the collision is elastic
Answer:
See below
Explanation:
There are 3600 seconds / hr
7.2 s / 3600 s/hr = .002 hr
Car traveled 1/10 mile in .002 hr
1/10 mi / .002 hr = 50 mi/hr
B. North Pole because it’s pointing at the north pole, and not the others