50 grams of ice cubes at -15°c are used to chill a water at 30°c with mass mh20 = 200 g. assume that the water is kept in a foam container so that heat loss can be ignored. find the final temperature.

Answer : The final temperature is,

Explanation :

In this problem we assumed that heat given by the hot body is equal to the heat taken by the cold body.

where,

= specific heat of ice =

= specific heat of water =

= mass of ice = 50 g

= mass of water = 200 g

= final temperature = ?

= initial temperature of ice =

= initial temperature of water =

Now put all the given values in the above formula, we get:

Therefore, the final temperature is,

i had this question and the answer was 3.15 miles.

martina travels from school to her mom's office. from there, she walks to school. after school, she walks to the library and then to a friends house before finally ending back at home. find martina's total distance traveled.

a) 0 miles  

b) 0.4 miles  

c) 1 mile  

d) 3.15 miles

weight of the box is given as

here this is placed on the inclined of angle 42 degree

now this weight will have two components one is along the incline other is perpendicular to it

so here we need to apply a force parallel to incline opposite to its component of weight

so here the component of weight is given as

here we have

so it requires 75 n force to move it upwards