Question

A) To measure the diameter of a ball bearing in a bicycle wheel hub, which of the following instruments is most appropriate? a) An electron microscope b) A meter stick c) A graduated cylinder d) Vernier calipers

B) A meter stick is balanced on a fulcrum at the 50 cm mark. A student simultaneously suspends a 500 g mass at the 0 cm mark, and a 1 kg mass at the 76 cm mark. What happens next? a) the meter stick does not move b) the meter stick drops on the 500 g side c)the meter stick drops on the 1 kg side d) aliens attack and the meter stick is incinerated by a space laser

C) A meter stick of uniform linear density weighs 100 g. It is balanced at the 10 cm mark over a fulcrum, and has only one mass suspended from it—at the 0 cm mark. How much does the mass weigh? a) 400 g b) 300 g c) 200 g d) 100 g

D) If a red car is going 55 mph, and a blue car is going 107 mph, then which of the following is true? a) the red car has better acceleration b) the blue car has better acceleration c) both of the cars have the same acceleration d) none of the above can be said with certainty

E) The magnitude of the vector (4,3) is a) (0,5) b) (0,7) c) 5 d) 7

F) Select the one answer that is most correct about motor vehicle collisions. a) Kinetic energy of vehicles is always conserved in vehicle collisions b) Momentum is always conserved in vehicle collisions c) Both momentum AND kinetic energy are conserved in vehicle collisions d) The sum of kinetic energy and momentum, together, is conserved

G) A spring with a spring constant of 10 N/m is suspended from the ceiling. A mass of 100 g is suspended from the spring. How much does the spring stretch? (Pay attention to units) a) .00098 m b) 9.8 cm c) 9800 cm d) 98 cm

Answer 1

A) To measure the diameter of a ball bearing in a bicycle wheel hub, which of the following instruments is most appropriate? a) An electron microscope b) A meter stick c) A graduated cylinder d) Vernier calipers

Correct option :- d) Vernier calipers

B) A meter stick is balanced on a fulcrum at the 50 cm mark. A student simultaneously suspends a 500 g mass at the 0 cm mark, and a 1 kg mass at the 76 cm mark. What happens next? a) the meter stick does not move b) the meter stick drops on the 500 g side c)the meter stick drops on the 1 kg side d) aliens attack and the meter stick is incinerated by a space laser

Clockwise Torque = 0.5 * 0.5 * 9.8 = 2.45 Nm
AntiClockwise Torque = 1 * (0.76 - 0.5) * 9.8 = - 2.548 Nm

Correct option:- c)the meter stick drops on the 1 kg side

C) A meter stick of uniform linear density weighs 100 g. It is balanced at the 10 cm mark over a fulcrum, and has only one mass suspended from it—at the 0 cm mark. How much does the mass weigh? a) 400 g b) 300 g c) 200 g d) 100 g

Let the mass be m
100 * (50 - 10) = m * 10
m = 400 g

Correct option :- (a)

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