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Physics
Physics
High School
In the absence of air resistance, at what other angle will a thrown ball go the same distance as one thrown at an angle of 75 degrees?.
Physics
High School
The mass of an object on the earth surface is 80kg. What will be the weight of the object on the moon?
Physics
High School
if your fixture contains a 60 w bulb at 120v, and your local power utility sells energy at 8 cents per kilowatt hour, how much will it cost to leave the bulb on for the whole month
Physics
High School
what is the magnitude of the electric field (in v/m) of these electromagnetic waves a distance of 3.5 m away from the bulb? for simplicity, treat the lightbulb as a point particle for the source of the electromagnetic waves and that the electromagnetic waves are propagating in vacuum.
Physics
High School
in a gaseous mixture of massive molecules and light molecules with the same average ke, which have the greater speed?
Physics
College
Observations suggest that Pluto is covered with icy frost and has a moderately high albedo (0.5). What isPlutos brightness (at the average opposition) relative to the sun if Plutos radius is 1120 km?
Physics
High School
One of the most efficient engines ever built is a coal-fired steam turbine engine in the Ohio River valley, driving an electric generator as it operates between 1,870C and 430C.(a) What is its maximum theoretical efficiency?___%(b) Its actual efficiency is 42.0%. How much mechanical power does the engine deliver if it absorbs 1.60 105 J of energy each second from the hot reservoir?___kW
Physics
High School
The specific gravity of an material is defined as the ratio of the density of the material to the density of water. the specific gravity of ice is 0.917, whereas that of seawater is 1.025. What fraction of an iceberg is above the surface of the water?
Physics
High School
One of the most efficient engines ever built is a coal-fired steam turbine engine in the Ohio River valley, driving an electric generator as it operates between 1,870C and 430C.(a) What is its maximum theoretical efficiency?___%(b) Its actual efficiency is 42.0%. How much mechanical power does the engine deliver if it absorbs 1.60 105 J of energy each second from the hot reservoir?___kW
Physics
High School
What is the frequency of a wave that has a speed of 0.4 m/s and a wavelength of 0.020 meter a 10 Hertz B 20 Hertz C 0.008 Hertz D 0.5 Hertz?
Physics
High School
describe the relationship between the object placement with respect to the focal length and the image formation for convex (converging) lenses.
Physics
High School
a circular ice rink of 25 m in diameter is enclosed by a hemispherical dome 35 m in diameter. if the ice and dome surfaces may be approximated as blackbodies and are at 0oc and 15oc, respectively, what is the net rate of radiative transfer from the dome to the rink?
Physics
High School
A planet is discovered that has twice the mass of earth but the same gravitational acceleration. If you weigh 700 n on earth, on the new planet you would weigh.
Physics
High School
you are holding two helium balloons, a large and a small balloon. how do the pressures of the helium compare?
Physics
High School
glycolysis, which provides energy by breaking down carbohydrates like glucose, relates to activities lasting __________.
Physics
High School
How do you calculate internal energy change?
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 body is a particular amount of matter. it can be a solid, liquid or gas. it can be described as existing in question 2 options: a) motion and force. b) size and shape. c) time and space. d) location and movement.
Physics
High School
What is the internal motion of particles called?
Physics
High School
Listed following are several stars found in the disk and halo of the Milky Way Galaxy. Assume that both the blue and yellow disk stars are members of the same open cluster. Rank the stars based on the abundance of elements heavier than carbon that you would expect to find in each of the stars, from highest to lowest.yellow main- sequence star in open cluster in diskhot, blue main- sequence star in open cluster in diskred giant in globular cluster M13Red main sequence star in globular cluster M13
Physics
High School
For Earth, we have our _________ held around the planet by gravity, that acts as "the world's biggest membrane."or the envelope of gasesA. insolationB. weatherC. airD. conductionE. ozoneF. ecologicalG. atmosphereH. sunI. convectionJ. tilts
Physics
High School
during isokinetic testing at high angular velocities (>240 deg/s), what is the approximate torque capability of eccentric muscle actions as compared to concentric muscle actions?
Physics
High School
What happens to the gravitational force between two objects when the distance between them is:(i) doubled?(ii) halved?
Physics
High School
A simple pendulum consisting of a blob of mass m attached to a string of length L swings with a period T. If the mass of the blob is reduced by half, what will the new period of oscillation be?
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