You think you might have mixed your salt (NaCl) up with naphthalene (C10H8). You know that NaCl is safe to eat, but C10H8 is very dangerous. You need to find out which one is which before you put it on your lunch. Design an investigation in the space below that will help you determine which substance is NaCl and which one is C10H8. How will you determine which substance is NaCl and which one is C10H8?

Explain why you think this will work.

compass can be used day and night, cloudy or sunny

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

a cold ice-tea.

pour in room temperature or cold water. cover the pitcher and refrigerate. steep white or green tea for 6 to 8 hours; steep black or oolong tea for 8 to 12 hours.jun 28, 2015