Maritime Physics Exam.docx

Set 1 3

1)A 2.0 x 10 -kilogram car travels at a constant speed of 12 meters per second around a circular curve of radius 30. meters. What is the magnitude of the centripetal acceleration of the car as it goes around the curve? A)0.40 m/s B)4.8 m/s

2

2

C)800 m/s

2

D)9,600 m/s

2

Ans 4.8m/s2

2)A 1.2-kilogram block and a 1.8-kilogram block are initially at rest on a frictionless, horizontal horizontal surface. When a compressed spring between the blocks is released, the 1.8-kilogram block moves to the right at 2.0 meters per second, as shown. What is the speed of the 1.2-kilogram block after the spring is released?

A)1.4 m/s B)2.0 m/s C)3.0 m/s

D)3.6 m/s Ans 3 m/s

3) Boiling and evaporation both involve a liquid turning into a vapour (i.e. a gas).The following statements relate to water.Which one is NOT true? Evaporation can happen only at the surface of the water. Boiling occurs within the main body of the water. Evaporation of water happens at all temperatures, but does so more rapidly when warm. Boiling of water can only happen at exactly 100 °C.

Ans

Boiling of water can only happen at exactly 100 °C.

4) A liquid is kept in a glass beaker. Which molecules of the liquid have the highest potential energy? (A) Molecules at the bottom of the beaker (B) Molecules near the centre of the liquid (C) Molecules lying at half the depth of the liquid and touching the walls of the  beaker (D) Molecules lying in the surface film Answer: molecules lying in the surface film

5) If the length of simple pendulum is increased by 44% then what is the change in the time period of the pendulum? (a) 22 % (b) 20 %

(c)

33 %

(d)

44 %

Ans 20%

Set 2

1)How far will a brick starting from rest fall freely in 3.0 seconds? A)15 m B)29 m C)44 m D)88 m

Ans 44m

2)Light Emitting Diodes (LED) used in fancy electronic devices such as toys emit

A) X-rays B) ultraviolet light C) visible light A) radio waves

Ans visible light

3)A 1,200-kilogram car traveling at 10 meters per second hits a tree and is brought to rest in 0.10 second. What is the magnitude of the average force acting on the car to bring it to rest? 2

A)1.2 × 10  N 3

B)1.2 × 10  N 4

C)1.2 × 10  N 5

D)1.2 × 10  N  5

Ans 1.2 X 10  N 4)When a liquid rises inside a capillary tube, the weight of the liquid in the capillary tube is supported (A) Entirely by atmospheric pressure (B) Entirely by the force due to surface tension (C) Partly by the force due to surface tension and partly by atmospheric  pressure (D) Entirely due to the upward component of the reaction (R) to the surface tension

Entirely due to the upward component of the reaction (R) to the surface tension

Answer:

5) When a boat sails from fresh water to salt water, the boat will float A) B) C) D)

lower in the water. higher in the water. at the same water level. none of above

Ans higher