Physics Electromagnetic Induction Level: High School
A conducting loop of wire is placed in a magnetic field that is normal to the plane of the loop . Which one of the following action will not be result in an induced current in the loop ?a) Rotate the loop about an axis that is parallel to the field and passes through the centre of the loop ,
b) Increase the strength of the magnetic field .
c) Decrease the area of the loop .
d) Decrease the strength of the magnetic field .
Rotate the loop about an axis that is perpendicular to the filed and passes through the center of the loop .
Physics Properties Of Matter Level: High School
Kinetic Energy of a Gas Molecule
A gas molecule with a molecular mass of 32.0 u has a speed of 325 m/s . What is the temperature of the gas molecule ?a) 72.0 K
b) 136 K
c) 305 K
d) 459 k
A temperature cannot be assigned to a single molecule .
Physics Properties Of Matter Level: High School
Solids
A plastic box has an initial volume of 2.00 m^3 . It is then submerged below the surface of a liquid and its volume decreases to 1.97 m^3 . Complete the following statement . In order to calculate the “stress” on the box , in addition to the information given , one must also know .a) the mass of the box
b) the bulk modulus of the material from which the box is made.
c) the shear modulus of the material from which the box is made .
d) the Young’s modulus of the material from which the box is made .
e) the bulk modulus of the liquid .
Physics Force & Laws Of Motion Level: High School
Conservation of Linear Momentum
In which one of the following situation is linear momentum not conserved ?a) A bomb suspended by a string explodes into one hundred fragments.
b) A bowling ball collides with ten pins.
c) A golf ball is struck by a club.
d) An astronaut floating in space throws a hammer away and subsequently moves in the opposite direction.
e) A tree limb is struck by lightning and falls to the ground .
e) A tree limb is struck by lightning and falls to the ground .
Physics Ray Optics Level: High School
Spherical Lens
Which of the following statements is true concerning the focal length of a lens ?a) The focal length is the same for all colors
b) The focal length is different for different colors because of reflection.
c) The focal length is different for different colors because of dispersion .
d) The focal length is different for different for different colors because of polarization.
e) The focal length is different for different colors because of spherical aberration.
Physics Properties Of Matter Level: High School
Pascal’s Law
In a hydraulic lift , the diameters of the pistons are 5.00 cm and 20.4 cm . A car weighing W = 10.2 kN is to be lifted by the force of the large piston ?b) When the small piston is pushed in by 10.1 cm, how far is the car lifted ?
c) Find the mechanical advantage of the lift, which is the ratio W/Fa .
Physics Waves And Oscillations Level: High School
What is the wavelength of the radio waves transmitted by an FM station at 90 MHz ? (Radio waves travels at 3.0 x 10^8 m/s)
Physics Waves And Oscillations Level: High School
Standing Waves
A cord of length 1.1 m is fixed at both ends. Its mass per unit length is 1.2 g/m and the tension is 11 N .a) What is the frequency of the fundamental oscillation ?
b) What tension is required if the n = 3 mode has a frequency of 0.50 kHz ?
Physics Waves And Oscillations Level: High School
a) What is the speed of the transverse string waves ?
b) What is the tension ?
c) What are the wavelength and frequency of the sound wave in air produced by vibration of the string ? The speed of sound in air at room temperature is 340 m/s .
Physics Ray Optics Level: High School
The longest “string” (a thick metal wire) on a particular piano is 3.0 m long and has a tension of 400.0 N . It vibrates with a fundamental frequency of 27.5 Hz . What is the total mass of the wire ?
Physics Ray Optics Level: High School
Interference
Two waves with identical frequency but different amplitudes A1 = 4.0 cm and A2 = 3.0 cm, occupy the same region of space (are superimposed).a) At what phase difference does the resulting wave have the largest amplitude ? What is the amplitude of the resulting wave in that case ?
b) At what phase difference does the resulting wave have the smallest amplitude and what is its amplitude ?
Physics Ray Optics Level: High School
Snell’s Law
An S wave crosses the boundary between two different types of rock. The angle of incidence is 21 degree and the angle of refraction is 34 degree. If the speed of the S wave before the boundary is 3.2 m/s, what is the speed past the boundary ?
Physics Ray Optics Level: High School
Light of wavelength 0.514 micro m (in air) enters the water in a swimming pool . The speed of light in water is 0.710 times the speed in air . What is the wavelength of the light in water ?
Physics Modern Physics Level: High School
Nuclear Fusion
One possible fusion reaction occurs when two deuterium nuclei combine to form nucleus of a helium atom. If the mass of each deuterium nucleus is 3.3444*10-27 kg and the mass of the helium nucleus is 6.6465*10-27 kg, how much energy is released when 1 kg of deuterium undergoes this fusion process ?
Physics Relativity Level: High School
Time dilation
There are a pair of identical twin astronauts. One remains on the earth while the other goes on an extended trip through the galaxy. During this trip, she avgs, a speed of .95 times the speed of light. Suppose this trip lasts for a period of 1 year, as measured by the traveling astronaut . What is the age difference between the twins when the traveler returns to earth ?