Phy 13 Diagnostic x 4q Sy14 15

5/10/2015

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Sunday, 10 May 2015, 2015, 3:53 PM 1 hour 52 mins

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Grade Gra de 10 10.00 .00 out of a maximum of 10.00 (100%) Question 1

Complete Mark 1.00 out of 1.00 Flag question

A wire under a tension of 120 N has a fund fundamen amental tal f req requen uency cy of 100 Hz. What w ill the fundamental frequency of the same wire be if both the length and the tension are doubled ? Select one: a. 15.35 hz b. 50 Hz c. 120 hz d. 70.71 Hz

Question 2

For a body in simple harmonic motion, the maximum acceleration occurs when


Select one: a. the displacement is zero. b. the displacement is maximum. c. the velocity is is constant. d. the velocit velocity y is maximum.

Question 3

Consider the following forces acting on an object: F 1 = 10 N due north

Complete

south east

Mark 1.00 out of 1.00

Select one:

Flag question

F2 = 20 N due

F3 = 5 N west . What is the magnitude of the resultant force?

a. 4 N b. 9 N c. 23 N d. 10 N

Question 4

A second seconds s pen pendulu dulum m i s one with a period of exactly two second seconds. s. Find the l eng ength th of a

Complete

seconds pendulum at Denver, Colorado (g=9.79609 m/s 2).


Select one:

Flag question

a. 1.25 m b. 0.01 m c. 0.993 m d. 96.7 m

Question 5

Two projectiles are launched launched with the same initial veloci ty. Projectile B is launched at an

http://buil der .m apua.edu.ph/m od/qui z/r evi ew.php?attempt= 250180&showal l = 1

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PHY 13 DIAGNOSTIC X 4Q SY14-15 Complete Mark 1.00 out of 1.00 Flag question

angle of 60o, while projectile A is launched at an angle of 30 o. Which of the following is true? Select one: a. All of the above are not true. b. Projectiles A and B will reach the same height. c. Projectile A has a range twic e that of projectile B. d. Projectile A will reach a height twice that of projectile B.

Question 6


A 3 nC charge is moved from point A to point B in an electric field. The charge experienced a voltage rise of 5 V. What is the work done in moving the charge from point A to point B. Select one: a. 15 nJ b. 0.6 nJ c. 2 nJ d. 1.67 nJ

Question 7

Complete

If the mass and the radius of the earth are both doubled,your new weight as compared to your present weight, would be _______ .


Select one:

Flag question

a. 1/2 as large b. 2 times as large c. 4 times as large d. 1/4 as large

Question 8

The gravitational constant is 6.67 x 10 -11 N . m2/kg2. The gravitational force between two

Complete

balls of equal masses is 2.668 x 10 -8 N when the balls are 0.20 m apart. Find the mass of each ball.

Mark 1.00 out of 1.00 Flag question

Select one: a. 16 kg b. 4 kg c. 80 kg d. 8 kg

Question 9


The wheel of a car rotating about a fixed axis has a constant angular velocity of 2.0 rad/s. When brake is applied, the wheel turned through 5.0 complete revolutions in 2 secs.. What is the angular acceleration of this wheel? Select one: a. 20 rad/s 2 b. 14 rad/s 2 c. 17 rad/s 2 d. 23 rad/s 2

Question 10

Complete Mark 1.00 out of 1.00

A submarine sends out a s hort sound called a "ping". An echo of the ping is detected 6 s after the pulse. If the speed of sound in the ocean is 1515 m/s, how far away is the reflecting surface ?

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PHY 13 DIAGNOSTIC X 4Q SY14-15 Flag question

Select one: a. 4545 m b. 9,090 m c. 9900 m d. 5545 m

Question 11


A projectile is fired at an angle of 60.0o above the horizontal with an initial speed of 30.0 m/s. What is the horizontal velocity of the projectile as it reached the ground ? Select one: a. 0 b. 30 m/s c. 15 m/s d. 26 m/s

Question 12


You want to throw a ball straight up into the air so that it reaches a height of 3.3 m above the ground. If the ball leaves your hand at a height of 1.2 m above the ground, how fast do you need to throw it? Neglect the effects of air resistance. Select one: a. 3.8 m/s b. 6.4 m/s c. 4. m/s d. 8m/s

Question 13

Complete

An object is being pulled along the ground by a 75N force directed 28° above the horizontal. How much work does the force do in pulling the object to a distance of 8m?


Select one:

Flag question

a. 420J b. 380J c. 250J d. 530J

Question 14

What is the unit of modulus of elasticity?


Select one: a. N m2 b. N/m c. N/m2 d. N m

Question 15

Complete

Given two vectors A = 4i – 2 j + 3k and B = – 2i + 3 j + 4k . The scalar product of these vectors is


Select one:

Flag question

a. – 8i – 6 j + 12k b. 2 i + j + 7 c. 26 d. – 2


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Question 16

Two equally positive charged pith balls are 3 cm apart in air and repel each other with a force

Complete

of 4 x 10-5 N. Compute the charge on each ball


Select one:

Flag question

a. 4 nC b. 3 nC c. 2 nC d. 1 nC

Question 17


Water flowing through the pipe with a radius of 4.2 cm passes into a section of pipe with radius of 6.6cm where it flows at the speed of 7 m/sec. What was the initial speed of the water? Select one: a. 12.7 m/s b. 14 m/s c. 15 m/s d. 17.3 m/s

Question 18

What is the resistance of a 1000 W, 120 V microwave oven ?


Select one: a. 14.4 Ω b. 8.33 Ω c. 8,333 Ω d. 0.12 Ω

Question 19


A brass cylinder is 60cm long at 25°C. What is the increase in length when it is heated to 55°C? (For brass, coeffic ient of linear expansion α = 1.7x10-5/°C) Select one: a. 0.0306 m b. 0.034m c. 0.057m d. 0.054m

Question 20


A cube of wood of density 0.78 g/cm 3 is 10 cm on a side. When placed in water, what height of the block will float above the surface? (water density = 1.00 g/cm3) Select one: a. 2.2 cm b. 6.4 cm c. 5.0 cm d. 7.8 cm

Question 21

A simple series c ircuit contains a resistance R of 10 ohms and an i deal battery of 20 volts. If


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PHY 13 DIAGNOSTIC X 4Q SY14-15 Complete Mark 1.00 out of 1.00 Flag question

a second resistor 10 ohms is connected in parallel with R, which of the following statements is correct? Select one: a. The current through R is 4 A . b. The current in the second resistor is 0.5A . c. The total resistance is 5 ohms. d. The voltage across R is 10 volts.

Question 22


The unstretched spring has a length of 0.6 m and spring constant 3600 N/m. A weight is hung from the spring, causing it to stretch by 0.3 m . How many joules of elastic potential energy are stored in the stretched spring? Select one: a. 40 joules b. 360 joules c. 640 joules d. 162 joules

Question 23

A net force of 10.0 N is applied tangentially to t he rim of a w heel having a 0.25-m radius. If the

Complete

rotational inertia of the wheel is 0.500 kg-m 2, what is its angular acceleration?


Select one:

Flag question

a. 5 rad/sec 2 b. 40 rad/sec 2 c. 20 rad/sec 2 d. 0.5 rad/sec 2

Question 24

Complete

How much salt water at 200°C must be added to 60 grams of the same salt water at 20°C to heat it to 50°C?


Select one:

Flag question

a. 29 grams b. 24 grams c. 19 grams d. 12 grams

Question 25

A metal container has a v olume of 400 c m3 at 0oC . If the coefficient of linear expansion is

Complete

0.000012 / Co , what is the volume at 60oC


Select one:

Flag question

a. 400 cm3 b. 400.684 cm3 c. 0.864 cm3 d. 400.864 cm3

Question 26

Two stones, one twice as heavy as the other, are both dropped at a certain height

Complete

to the ground. The heavier stone’s speed right before it hits the ground, as


compared to the lighter one, is


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PHY 13 DIAGNOSTIC X 4Q SY14-15 Flag question

Select one: a. no comparison b. the same c. slower d. faster

Question 27


A 20 gram marble moving 25 cm/sec to t he right collides with a 30 gram metal ball moving 15 cm/sec to the left. What is the velocity of the two bodies if the collision is perfectly inelastic ? Select one: a. 9 cm/sec b. 1 cm/sec c. 4 cm/sec d. 1.25 cm/sec

Question 28

According to Newton’s 3 rd Law of Motion, which of the following statements is NOT true?


Select one: a. Action and reaction forces cancel each other because they are equal and opposite. b. Forces always come in pairs. c. Action and reaction forces do not cancel each other because they act on two different bodies. d. Action and reaction forces are ALWAYS equal in magnitude and act in opposite directions.

Question 29


An automobile moves on a level horizontal road in a circle of radius 30 m. The coefficient of friction between tires and road is 0.50. The maximum speed with which this car can round this curve is: Select one: a. 4.9 m/s b. 3.0 m/s c. 12 m/s d. 9.8 m/s

Question 30


An Everest is moving at 50 m/s towards a gas station with its horn sounding at an unknown frequency. The gasoline boy standing at the station hears the sound at a frequency of 500 hertz What is the true frequency of sound from the horn if the speed of sound in air is 348 m/s ? Select one: a. 583.9 hertz b. 500 hertz c. 428.2 hertz d. 571.84 hertz

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