Acar drives around a horizontal, circular track at constant speed. consider the following three forces that act on the car: (1) the upward normal force exerted on the car by the road, (2) the downward gravitational force on the car, (3) and the frictional force that is directed toward the center of the circular path.
at thermal equilibrium, the heat given by the hotter mass of water must be equal to the heat absorbed by the colder water (because energy cannot be destroyed nor created). in formula:
is the mass of the hot water
ch is the specific heat of the hot water
is the variation in temperature of the hot water
is the mass of the cold water
cc is the specific heat of the cold water
is the variation in temperature of the c water
we notice that:
since the two masses are equal, and
because the substance is the same (water)
so, the above equation just simplifies as
which can be rewritten as:
where t_f is the temperature of both masses of water at equilibrium. by solving the equation, we find
stroma. in the stroma are grana, stacks of thylakoid, others. stroma contains important molecules which are useful for the photosynthesis and other metabolic functions of the cells. it may also contain enzymes and ions.
a distance-time graph indicates that an object moves 100m in 4s and then remains at rest for 6s. what is the average speed of the object?
what is this from?