A piston releases 18 J of heat into its surroundings while expanding from 0.0002 m2 to 0.0006 mº at a constant pressure of 1.0 x 105 Pa. What are the
correct values for heat and work for the piston?
A. Q = -18 J, W = +40 J
B. Q = +18 J, W = +40 J
C. Q = -18 J, W = -40 J
D. Q = +18 J, W = -40 J

the answer is 46 mls because when you add the speed per second it increses the speed

the minimum constant speed at which she can catch the train is 2.7 m/s

given:

acceleration = 0.6

time = 4.5 s

to find:

velocity = ?

formula used:

from 1st kinematic equation we get,

v = u + at

u = initial speed of train = 0 m/s

v = final speed of the train

a = acceleration of the train

t = time

solution:

from 1st kinematic equation we get,

v = u + at

u = initial speed of train = 0 m/s

v = final speed of the train

a = acceleration of the train

t = time

v = 0 + (0.6 × 4.5)

v = 2.7 m/s

the minimum constant speed at which she can catch the train is 2.7 m/s

snell's law

refractve index = sin incidence / sin refraction