Master Physics with Fun Quizzes & Brain Teasers!

for a 10-bit dac with vfsr = 5v, what is the: 1. output voltage for an input code of 721? 2. smallest voltage increment at the output?
1 Answer
If our Sun (mass = 1.99 x10^30 kg, radius = 6.96 x10^88 m) were to collapse into a neutron star (an object composed of tightly packed neutrons with roughly the same density as neutrons within a nucleus), what would the new radius of our "neutron-sun" be? (Assume that the density of a nucleus is 2.3 x 10 ^17 kg/m3.)
1 Answer
A 60 W light bulb is placed in a fixture with a reflector that makes a spot of radius 21 cm. Calculate approximately the amplitude of the radiative electric field in the spot.
1 Answer
for the kinetic energy of a rigid body in general motion, we consider the translational and rotational components of the same point.T/F
1 Answer
when two tuning forks of 115 hz and 149 hz, respectively, are sounded simultaneously, how many beats per second are heard? answer in units of beats/s.
1 Answer
In the Compton effect, an X -ray photon scatters from a free electron.. find the change in the photon's wavelength if it scatters at an angle of = 30.0 relative to the incident direction.
1 Answer
Today's lifestyles have led to increased demands for disposable products. The packaging of these products has caused environmental problems most directly associated with(1) food web contamination(2) atmospheric depletion(3) solid waste disposal(4) the use of nuclear fuels
1 Answer
To which region of the electromagnetic spectrum does the peak emission of an electric stove (T=660 K) belong to?A) Blue end of the visible spectrum.B) Red end of the visible spectrum C) Microwave regionD) Infrared region
1 Answer
how many places are within an ohio county with more than 50,000 persons and also within 0.25 miles of a major road?
1 Answer
a simple pendulum of length 2.6 m makes 4.0 complete swings in 12.8 s .
1 Answer
at the surface of earth, the escape velocity is 11.2 km/s. in this question you will investigate the escape velocity at the surface of a very small asteroid having a radius 10-4 that of earth and a mass 10-12 that of earth
1 Answer
roller coaster car drops a maximum vertical distance of 35.4 m . part a determine the maximum speed of the car at the bottom of that drop. ignore work done by friction. express your answer with the appropriate units. activate to select the appropriates template from the following choices. operate up and down arrow for selection and press enter to choose the input value typeactivate to select the appropriates symbol from the following choices. operate up and down arrow for selection and press enter to choose the input value type vf
1 Answer
an object is placed on a ramp and slides to the ground. if the ramp makes an angle of 40 degrees with the ground and the object weighs 25 pounds. find the acceleration of the object
1 Answer
A 7.0 g ice cube at -20 C is in a rigid, sealed container from which all the air has been evacuated. Steam has CV = 1500 J/kgK and CP = 1960 J/kgK.How much heat is required to change this ice cube into steam at 170 C ?
1 Answer
If the power series Z an(x 4)" converges at x = 7 and diverges at x = 9, which of the following n=0 must be true? The series converges at X= 1. LI: The series converges at X= 2. III: The series diverges at x = -1 (A) only (B) IL only (C) Tand II only (D) II and III only
1 Answer
At 12.15 degrees C a brass sleeve has an inside diameter of 2.19620 cm and a steel shaft has a diameter of 2.19888 cm. It is desired to shrink-fit the sleeve over the steel shaft.To what temperature, in degrees C, must the sleeve be heated in order for it to slip over the shaft?Alternatively, to what temperature, in degrees C, must the shaft be cooled before it is able to slip through the sleeve?
1 Answer
at what velocity (in m/s) will an electron have a wavelength of 3.09 m
1 Answer
suppose the tension is tripled while the frequency shaking the string is held constant. will there be a standing wave?
1 Answer
if a solution looks blue, it is absorbing light with around a 600nm wavelength. T/F?
1 Answer
when the temperature of a meter stick is increased by 20 c, the length increases by 0.48 mm. what is the coefficient of linear expansion of the meter stick?
1 Answer
two ladybugs are crawling across a record that is on a record player. the record player is turned on and it reaches a constant angular velocity. if the male ladybug is all the way at the edge and the female ladybug is halfway between the center and the edge, consider the following questions.
1 Answer
A simple pendulum consisting of a small object has mass m attached to a string of length l has a period T. A pendulum with which of the following combinations of object mass and string length will also have period T: 1. m/2 and l 2. m and l/3 3. 2/m and l/2/ 4. 2m and 4l 5. 4m and 2l
1 Answer
If the voltmeter used in problem 84 holds steady at 45 V and the ammeter reading holds steady at 5.0 A, estimate the time in seconds required to completely vaporize the water in the beaker. Use 4,2 kJ/kg. C as the specific heat of water and 2,3 x 10^6 J/kg as the heat of vaporization of water.
1 Answer
4 kg steel ball is attached to a vertical spring. It starts a simple harmonic oscillation between a high point A and a low point B that are 20cm apart, with a period of t seconds. a) What is the amplitude of the oscillation? b) Spring constant of the spring? c) Maximum speed? d) Where is the location of the ball when it has the maximum kinetic energy (use A or B as reference points)?
1 Answer