QUIZ 2

A compound contains 40% C, 6.7% H, and 53.3% O by mass. What is its empirical formula?

• C₃H₆O₂

• CH₂O

• C₂H₄O₂

• CH₄O

A cylinder contains 0.5 mol of nitrogen gas at 300 K and 2 atm. What is the volume of the gas? (Use R = 0.0821 L-atm/mol-K)

• 6.16 L

• 12.30 L

• 8.21 L

• 4.92 L

A 500 N man climbs at a middle of a 100 N ladder leaned against a wall. The top portion of the ladder is 4m from the ground and its bottom is 2m from the wall. Assuming smooth wall and a stopper at the bottom of the ladder to prevent slipping, find the reaction at the wall.

• 100 N

• 150 N

• 200 N

• 250 N

A simply supported beam is five meters in length. It carries a uniformly distributed load including its own weight of 300 N/m and a concentrated load of 100 N 2 meters from the left end. Find the reactions.

• 810 and 790

• 820 and 690

• 830 and 680

• 840 and 760

A sphere weighing 200 N is tied to a smooth wall by a string which makes 20 deg in the vertical axis with the wall. Find the tension of the string supporting the sphere.

• 534.34 N

• 212.84 N

• 312.56 N

• 124.45 N

Determine the horizontal force P to be applied to a block weighing 2500 N to hold in position on a smooth inclined plane 30 deg. with the horizontal.

• 1534.34 N

• 1443.38 N

• 2142.56 N

• 1324.45 N

A trapezoid has two equal slanting sides, a 6 cm base and 3 m top parallel to and 5 cm above the base. Determine the moment of inertia of the trapezoid area relative to the top side in cm⁴.

• 218.75

• 240.63

• 264.69

• 198.86

Two children each weighing 75 lbs. They are seated beside each other 1.25 m from the fulcrum of a seesaw. Where on the opposite of the fulcrum side should a 100 lb child sit to balance the seesaw?

• 1.58 m

• 1.34 m

• 1.23 m

• 1.88 m

An object weighing 400 N is held by a rope that passes over a horizontal drum. The coefficient of friction between the rope and the drum is 0.25. If the angle of contact is 150 deg, determine the force that will raise the object.

• 350 N

• 540 N

• 770 N

• 780 N

A particle is thrown 100 m/s at 30 deg from a horizontal plane and follows a parabolic path. Determine the range.

• 890 m

• 883 m

• 878 m

• 875 m