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Physics
Physics
High School
How do you calculate frequency?
Physics
High School
a 900 kg car moving at 10 m/s takes a turn around a circle with a radius of 25.0 m. determine the centripetal force acting on the car.
Physics
High School
John is swinging a 100 g mass on a string around his head.On one end of the string is a spring scale that says he isexerting 5 N of centripetal force. Attached to the mass is aspeedometer that tells him the mass is moving at 4 m/s. Howlong is the string?
Physics
College
if the mass of an object were doubled, its weight would be
Physics
High School
What is the energy in a moving vehicle of mass 1500 kg at 60km hr?
Physics
High School
monochromatic light falls on a screen 1.75 m from two slits separated by 2.10 mm. the first- and second-order bright fringes are separated by 0.552 mm. what is the wavelength of the light?
Physics
High School
find the net gravitational force fnet acting on the earth in the sun-earth-moon system during the full moon (when the earth is located directly between the moon and the sun).
Physics
High School
a string (with uniform mass density) is attached to a wave generator with variable frequency to create standing wave patterns. the string goes over a pulley and is connected to a mass (which can be varied) to create tension in the string. 1) if the frequency is changed (while the mass is held fixed), what else will change? the wavelength of the wave will change. the speed of propogation of the wave will change.
Physics
High School
You place a 500 g block of an unknown subtance in an insulated container filled 2 kg of water. the block has an initial temperature of 50 degrees c. the water is initially at 20 degrees c. if the equilibrium temperature of the block and water is 25 degrees c, what is the specific heat of the block?
Physics
High School
the formation ionic bond involves the _ of electrons
Physics
High School
a person can see clearly up close, but cannot focus on objects beyond 72.0 cm. she opts for contact lenses to correct her vision. part a part complete is she nearsighted or farsighted? is she nearsighted or farsighted? she is nearsighted. she is farsighted. previous answers correct part b part complete what type of lens (converging or diverging) is needed to correct her vision? what type of lens (converging or diverging) is needed to correct her vision? converging lens. diverging lens. previous answers correct part c what focal-length contact lens is needed ? templatessymbols undoredoresetkeyboard shortcutshelp f
Physics
High School
a dentist's mirror is placed 2.4 cm from a tooth. the enlarged image is located 6.5 cm behind the mirror. (a) what kind of mirror (plane, concave, or convex) is being used? (b) determine the focal length of the mirror. (c) what is the magnification? (d) how is the image oriented relative to the object?
Physics
High School
white light is incident on a diffraction grating that is 600 lines/mm. at what angle relative to the center line will light with a wavelength of 650 nm exit the grating for the first order spectrum (m
Physics
High School
how much energy is required to remove a proton from 157n ? the masses of the atoms 157n , 146c and 11h are 15.000109 u , 14.003242 u and 1.007825 u , respectively.
Physics
High School
A newly discovered planet has a mass that is 4 times the mass of the Earth. The radius of the Earth is R . If the gravitational field strength at the surface of the new planet is equal to that at the surface of the Earth, what is the radius of the new planet? A. R/2B. 4RC. R/4D. 2R
Physics
College
Problem 4 Consider two superconducting wires, tin (Sn, Type I) and Nb3Sn (Type II), each 1 mm in thickness. The magnetic field on the surface of a current-carrying conductor is given by BMol 2nr a) Assuming that Sn wire loses its superconductivity when the field at the surface reaches the critical field (0.2 T), calculate the maximum current and hence the critical current density that can be passed through the Sn wire near absolute zero of temperature. b) Calculate the maximum current and critical current density for Nb3Sn wire using the same assumption as in part (a) but taking the critical field to be the upper critical field Bc2, which is 24.5 T at 0 K. How does your calculation of Je compare with the critical current density of about 10" A/m for Nb3Sn at OK?
Physics
College
In the laboratory, you connect a resistor and a capacitor with unknown values in series with a battery of emf = 12 V. You include a switch in the circuit. When the switch is closed at time t = 0, the circuit is completed, and you measure the current through the resistor as a function of time as plotted below. A data-fitting program finds that the current decays according to the equation Using common symbols for the battery, the resistor, the capacitor, and the switch, draw the circuit that you constructed (on paper). Show the circuit before the switch is closed and include whatever other devices you need to measure the current through the resistor to obtain the above plot. Label each component in your diagram.
Physics
High School
A revolutionary war era cannon is used in a demonstration. If the 200 kg cannon is on wheels when it's fired, it recoils. if the recoil speed is 0.8 m/s, what is the speed of the 9 kg cannon ball?
Physics
High School
Covalent bonds are most likely to form between atoms of which types of elements?.
Physics
High School
describe the transformation from snow to ice by arranging the following steps in order.
Physics
High School
The growth hormone axis contains at least one example of a negative feedback loop.TrueFalse
Physics
High School
a lens produces an inverted image of a candle on the wall. the distance between the candle and the lens is 32 cm and the distance between the lens and the wall is 30 cm . what is the power of the lens? express your answer in diopters. enter a positive value if the lens is converging and a negative value if the lens is diverging.
Physics
High School
what is the x -coordinates of the center of mass? hint: divide the triangle into vertical strips of width dx , then relate the mass dm of a strip at position x to the values of x and dx .
Physics
High School
sodium vapor light averaging 589 nm inwavelength falls on a single slit of width. at what angle does it produces itssecond minimum? (b) what is the highest-orderminimum produced?
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