Solved Problems in Basic Physics

5 Parabolic motion Work and kinetic energy Linear momentum Linear and angular motion Problems and Solutions

1. A ball is thrown from the top of a building with an initial speed of 8 m/s at an angle of 20^o below the horizontal. The ball hits the ground 3 seconds later.

a) How far from the bottom of building the ball touches the ground

b) How high is the ball thrown from the place

c) How long the ball reaches a height of 10 m from the place of throwing

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1. The distance between the two troughs of the water surface waves is 20 m. An object floats on the surface of the water so that it experiences the vibration motion. If the time to travel one vibration is 4 seconds, then the velocity of wave is …. m/s

A. 20

B. 15

C. 10

D. 5

Known :

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1. The speed of the transverse wave on a 25 meters rope is 50 m/s. The tension force of the rope is 200 N. Determine the mass of rope.

A. 0.08 kg

B. 0.5 kg

C. 0.8 kg

D. 2.0 kg

Known :

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1. An object vibrates with a frequency of 5 Hz to rightward and leftward. The object moves from equilibrium point to the maximum displacement at rightward. Determine the time interval required to reach to the maximum displacement at rightward eleven times.

A. 2.05

B. 2.20

C. 2.25

D. 2.50

Known :

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1. Two simple pendulums are in two different places. The length of the second pendulum is 0.4 times the length of the first pendulum, and the acceleration of gravity experienced by the second pendulum is 0.9 times the acceleration of gravity experienced by the first pendulum. Determine the comparison of the frequency of the first pendulum to the second pendulum.

A. 2/3

B. 3/2

C. 4/9

D. 9/4

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1. After the tuning fork A is vibrated, the tuning fork B is vibrated. The tuning fork B is vibrated because…..

A. The tuning fork A has the same amplitude as the tuning fork B

B. Both tuning forks use the same resonance box

C. The tuning fork B has the same frequency as the tuning fork A

D. The timbre of the sounds caused by both tuning forks are the same

Solution

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1.

Acceleration due to gravity is 10 N/kg. The surface area of fish pressed by the water above it is 6 cm². Determine the force of water above fish that acts on fish.

Known :

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1. A person is in an elevator that moving upward at a constant velocity. The weight of the person is 800 N. Immediately the elevator rope is broke, so the elevator falls. Determine the normal force acted by elevator’s floor to the person just before and after the elevator’s rope broke.

A. 800 N and 0

B. 800 N and 800 N

C. 1600 N and 0

D. 1600 N and 800 N

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6 The International system of units Unit Prefixes – Problems and Solutions

The International System of Units

1. Which of the following units is not a unit of length

A. Mil

B. Foot

C. Inch

D. Knot

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1. Half a liter of fresh milk mixed with pudding sauce, then what is the volume of milk to be put in pudding sauce…

A. 5000 ml

B. 500 cc

C. 50 dm³

D. 5 m³

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