Physics Force & Laws Of Motion Level: High School
Pulley Having Mass
A 15.0 kg object and a 10.0 kg object are suspended joined by a cord that passes over a pulley with a radius of 10.0 cm and a mass of 3.00 kg . The cord has a negligible mass and does not slip on the pulley . The pulley rotates on its axis without friction . The objects start from rest 3.00 m apart . Treat the pulley as a uniform disk , and determine the speeds of the two objects as they pass each other .
Physics Rotational Mechanics Level: High School
Rotational Kinetic Energy
The top in the figure at “click here” has a moment of inertia of 4.00 x 10^-4 kg.m^2 and is initially at rest . It is free to rotate about the stationary axis AA’ . A string , wrapped around a peg along the axis of the top , is pulled in such a manner as to maintain a constant tension of 5.57 N . If the string does not slip while it is unwound from the peg , what is the angular speed of the top after 80.0 cm of string has been pulled off the peg ?
Physics Ray Optics Level: High School
Lenses
Find the image position and magnification when an object is placed .a) 30 cm from a converging lens of focal length 20 cm .
b) 10 cm from a diverging lens of focal length 15 cm .
Are the image real or virtual , erect or inverted ?
Physics Ray Optics Level: High School
Refraction through a prism
A glass prism of refractive index 1.5 has a refracting angle of 45 degree , Calculate the angle of minimum deviation and the angle of incidence for which this occurs .
Physics Ray Optics Level: High School
Refraction
The light beam shown in the figure at “click here” makes an angle of 20 degree with the normal line NN’ determine the angle theta and theta .
Physics Ray Optics Level: High School
Refraction
A fish in a pond is 3 cm below the surface .a) What is the apparent depth of the fish for a fisherman in a boat directly above ?
b) What is the apparent depth for the fisherman that makes an angle of theta = 20 degree with the normal , when looking at where the fish appears to be . Assume that the image is above the fish (as seen in the figure at “click here”) (n water = 1.33 , n air = 1)
Physics Ray Optics Level: High School
Lenses
Two lenses are made from fused quartz , n = 1.46 . The first lens is a double convex lens with the magnitude of the focal length equal to 52 cm . The second lens is a double concave with the magnitude of the focal length equal to 23 cm . The converging lens is placed 15 cm to the left to the diverging lens . A real object is placed 45 cm to the left of the converging lens .a) Calculate the radius of the curvature of the surface of the converging lens .
b) Calculate the position of the final image with respect to the diverging lens .
c) Calculate the final (total) magnification .
d) Is the final image real or virtual ? Inverted or the same orientation as the object ?
Physics Electromagnetic Induction Level: High School
A 95.7 MHz FM station radiates 45 kW uniformly in all directions .a) Calculate the wavelength of the wave .
b) Calculate the intensity of the wave 35 km from the source .
c) Calculate the magnitude of the electric and magnetic fields of the waves 35 km from the source .
d) Suppose a metal sheet that will reflect 100% of the incident wave is placed perpendicular to the direction of the wave (the wave is reflected back toward the source by the sheet ) . Calculate the pressure exerted on the sheet by the wave if the sheet is 35 km from the source .
Physics Ray Optics Level: High School
Relativity
C) An electron (m = 9.1 e -31 kg ) has a speed of .95c . Its kinetic energy is ?
Physics Ray Optics Level: High School
Convex Lens
A) In a cinema , a picture 2.5 cm wide on the film is projected to an image -++3.0 m wide on a screen which is 18 m away . What is the focal length of the lens ?
Physics Ray Optics Level: High School
Interference
B) In a double-slit experiment , light of wavelength 500 nm illuminates two slits that are separated by 1 mm . The separation between adjacent fright fringes (close to the center) on a screen 5 m from the slits is what distance ?
Physics Ray Optics Level: High School
Convex Mirror
At an intersection of hospital hallways , a convex mirror is mounted high on a wall to help people avoid collisions . The mirror has a radius of curvature of 0.559 m . Locate the image of a patient from 29.7 m the mirror . Answer in units of m .a) Find the magnification .
b) Describe the image ,
1) real , inverted , smaller
2) virtual , inverted , smaller
3) virtual, upright , smaller
4) virtual , upright , larger
5) None of the these
6) real, upright , larger
7) virtual, inverted, larger
8) real, upright, smaller
9) real , inverted, larger
Physics Ray Optics Level: High School
Concave Mirror
A concave mirror has a radius of curvature of 1.61 m . Calculate the position of the image produced when an object is placed 2.35 m from the mirror . Answer in units of m .a) Calculate the piston of the image when an object is placed 0.478 from the mirror . Answer in units of m .
Physics Ray Optics Level: High School
What causes refraction ?1) the existence of different colors of light .
2) none of the above
3) the difference in the speed of light in different transparent media
4) the speed of light being higher than c in some media .
5) reflection
Physics Ray Optics Level: High School
Refraction
The wavelength of red light in air is 530 nm . What is its frequency ? Answer in units of Hz .a) What is its wavelength in glass that has an index of refraction of 1.5 ? Answer in units of nm .
b) What is its speed in the glass ? Answer in units of m/s .
