Category: Solved Problems in Basic Physics

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 Continue reading “Parabolic motion, work and kinetic energy, linear momentum, linear and angular motion – problems and solutions”

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 : Continue reading “Transverse waves – problems and solutions”

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 : Continue reading “Speed of the mechanical waves – problems and solutions”

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 : Continue reading “Simple harmonic motion – problems and solutions”

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 Continue reading “Simple pendulum – problems and solutions”

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 Continue reading “Resonance of sound wave – problems and solutions”

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 : Continue reading “Pressure of fluids – problems and solutions”

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 Continue reading “Newton’s first law of motion – 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 Continue reading “The International System of Units, Unit Prefixes – problems and solutions”

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 Continue reading “Conversion of units – problems and solutions”