Choose the correct (a) Which of the following formula is used to determine the force?
(i) f=m/a
(ii) f= a/m
(iii) f= ma
(iv) f = ma
(b) Frictional force is due to the
(1) Falling of a body
(ii) Smooth surfaces between two bodies
(iii) moving in a circular path
(iv) rough surfaces between two bodies
(c) A body moving in a circular path experiences a force towards the center is
(i) frictional force
(ii) centripetal force
(iii) gravitational force
(iv) magnetic force
(d) The attraction or repulsion between two charged bodies is due to
(i) gravity
magnetic force
(111) electrostatic force
(iv) centripetal force
(e) A magnet attracts iron, cobalt and nickel due to
(1) electrostatc force
(ii) magnetic force
(iii) gravitational force
(iv) centripetal force
(f) The S. I. unit of acceleration is
(i) m/s2
(ii) m/s
(ii) m
(iv) N
(g) Speed is a
(i) scalar quantity
(ii) vector quantity
(iii) both
(iv) none

Arollercoaster car at the top of a hill has potential energy kinetic energy chemical energy light energy

7. using your knowledge of colligative properties explain whether sodium chloride or calcium chloride would be a more effective substance to melt the ice on a slick sidewalk. use 3 – 4 sentences in your explanation. 8. when a 2.5 mol of sugar (c12h22o11) are added to a certain amount of water the boiling point is raised by 1 celsius degree. if 2.5 mol of aluminum nitrate is added to the same amount of water, by how much will the boiling point be changed? show all calculations leading to your answer or use 3 – 4 sentences to explain your answer. 9. if 5.40 kcal of heat is added to 1.00 kg of water at 100⁰c, how much steam at 100⁰c is produced? show all calculations leading to an answer. 10. the freezing of water at 0⁰c can be represented as follows: h2o (l) ↔ h2o(s) the density of liquid water is 1.00 g/cm3. the density of ice is 0.92 g/cm3. in 3 – 4 sentences explain why applying pressure causes ice to melt.

In the reaction between a crushed antacid tablet and vinegar what gas is emitted