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in a house the temperature at the surface of a window is 23degc the temperature outside at the window surface is 4degc
one end of a brass bar is maintained at 298degc while the other end is kept at a constant but lower temperature the
a sample of an unknown material appears to weigh 285 n in air and 180 n when immersed in alcohol of specific gravity
a spherical weather balloon is filled with hydrogen until its radius is 310 m its total mass including the instruments
a gas while expanding under isobaric conditions does 500 j of work the pressure of the gas is 16 105 pa and its initial
a calculate the absolute pressure at the bottom of a fresh-water lake at a depth of 238 m assume the density of the
a high-speed lifting mechanism supports a 790-kg object with a steel cable that is 320 m long and 400 cm2 in
explain the principle and construction of a hydrometer what is the purpose of the common measurements of the specific
a storage tank 30 m high is filled with gasolinea find the gauge pressure at the bottom of the tankb calculate the
a explain how a submarine is caused to submerge and surface without the use of its propulsion propeller and finsb which
a student wants to determine the coefficients of static friction and kinetic friction between a box and a plank she
a child places a picnic basket on the outer rim of a merry-go-round that has a radius of 42 m and revolves once every
radio waves are electromagnetic waves that travel at a speed of 300 108 ms the speed of light an am radio station has
a rectangular loop is made up of 50 turns of wire and has dimensions of 23 x 64 cm it is located in a uniform 1 t
seat belts and air bags save lives by reducing the forces exerted on the driver and passengers in an automobile
a 10 g ball of clay traveling east at 15ms collides and sticks together with a 30g ball of clay traveling north at
two narrow slits are illuminated by a laser with a wavelength of 593 nm the interference pattern on a screen located x
a 300 g bird flying along at 55 ms sees a 10g insect heading straight toward it with a speed of 25 ms as measured by an
a strong man is compressing a lightweight spring between two weights one weight has a mass of 23 kg the other a mass of
two lenses are mounted in a tube such that the distance between them can be varied this device can be used as either a
two radio-frequency point sources s1 and s2 separated by distance d 16 m are radiating in phase with 04 m a detector
a reflecting telescope has a main mirror with fm 680 mm if an eyepiece with a magnification of 40 is used what is the
a person is nearsighted and can clearly focus on objects that are no farther than 26 m away from her eyes she borrows a
a certain gyroscope consists of uniform disk with a 50 cm radius mounted at the center of an axle that is 11 cm long
in 1980 over san francisco bay a large yo-yo was released from a crane suppose the yo-yo was 135 kg and it consisted of