2. Physics - Q&A
134 questions found
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The temperature of boiling water at standard pressure on the Fahrenheit and Centigrade scale is
- 100 deg. and 32 deg. Respectively.
- 212 deg. and 100 deg. Respectively.
- 180 deg. and 100 deg. Respectively.
why is this here (coming from CASA system) this is a buit random
If pressure on a liquid increases, whilst temperature is held constant, the volume will
- slowly decrease.
- remain constant.
- slowly increase.
doesn't the quation is PV divided by T， so the pressure and volume will be inversely proportional with each other?
A body dropped from 10 m will hit the ground in
- 2.83 seconds.
- 0.71 seconds.
- 1.41 seconds.
PLEASE EXPLAIN FOR ME?? THINKS
What is the Kinetic Energy of a 2 kg object moving at a velocity of 12 m/s?
- 288 Joules.
- 24 Joules.
- 144 Joules.
COULD SOMEONE PLEASE EXPLAIN?
The specific torque loading for a bolt is 50 lbs.ins but an extension of 2 inches is needed to reach the bolt in addition to the 8 inches torque wrench. What will the actual reading?
- 54 lb.ins.
- 40 lb.ins.
- 60 lb.ins.
can someone please explain this?
A body which is allowed to expand when heated, expands past the pressure imposed on it and
- a force acts.
- heat is lost.
- work is done.
Please write your question here.
In fibre optics. The fibre cable has a refractive index of 1.5, what is its speed?
- 300 meters/microsecond.
- 400 meters/microsecond.
- 200 meters/microsecond.
Why?
The centre of gravity of an aircraft is adjusted by two weights, 10 kg and 5 ckg plaed 4m and 2 m aft of the c of g. To what position must a 20 kg weight be added to balance the c of g?
- 2.5m.
- 1.5m.
- 3.0m.
Why
Heat transmission by convection is confined to
- liquids and gases.
- gases and solids.
- solids and liquid.
Please write your question here.
A ball is dropped from rest. What is its speed after 4 seconds? (Take g as 10m/s/s)
- 80m/s.
- 40m/s.
- 20m/s.
Please write your question here.
1kg of water is heated from 0 degrees C to 2 degrees C. Its volume will
- decrease.
- increase.
- stabilize.
Nevermind, i found out that heating water until 4 celsius decreases it's volume and after that it starts to increase
1kg of water is heated from 0 degrees C to 2 degrees C. Its volume will
- decrease.
- increase.
- stabilize.
Shouldn't volume increase with the increase of temperature? Maybe someone has an explanation or is this question wrong.
When a square block of material is pushed into a parallelogram, the material is under what stress type?
- Twist.
- Creep.
- Shear.
why?
P 1 * V 1 / T 1 = P2 * V2 / T2 is (P =Pressure, V = Volume, T =Temperature)
- Ideal gas law.
- Charles' law.
- Dalton's law.
Is this not the combined gas law?? Charles law, Boyles law and Guy Luccas law.
The ideal gas law is PV = nRT
The standard temperature and pressure for measuring the density of liquids is
- 15 degrees C and 760 mmHg.
- 0 degrees C and 760 mmHg.
- 4 degrees C and 760 mmHg.
why?
An object accelerating down a slope would gain kinetic energy
- less than the potential energy lost.
- unrelated to potential energy lost.
- equal to the potential energy lost.
It did not says "without drag"
A mass of 3kg weighs approximately
- 0.675 N
- 6.6 LB.
- 1.3 LB.
Please write your question here.
If a hydrogen atom has 2 neutrons and 1 proton what kind of water would you get?
- Fresh water.
- Heavy water.
- Light water.
can you tell me why? please
How would you work out the work done by a machine assuming it is 100% efficient?
- Velocity ratio and efficiency.
- Mechanical advantage and output.
- Mechanical advantage and input.
WHY?
What is the SI units for specific heat capacity?
- Jkg-1k-1.
- Jkg-1S-1.
- Jm-1k-1.
WHY?
If a light is beamed at a flat mirror, what is the angle it reflects at?
- Angle of reflection.
- Angle of incidence.
- Angle of refraction.
WHY??
What is 1 btu/lb in j oules per kilogram?
- 2326 j/kg.
- 4128 j/kg.
- 1055 j/kg.
WHY
One degree increment on the Centigrade scale is equal to what increment on the Fahrenheit scale?
- 1.8 degrees F.
- 33 degrees F.
- 12 degrees F.
THIS IS WRONG.
C=5/9(F-32)
THEN IT IS 33C
1 kW is
- 3413 BTU per hour.
- 1.56 HP or 1100 W.
- 4200 BTU per hour.
WHY???
One atmosphere is equal to
- 10.3 lbf/in2.
- 14.7 lbf/in2.
- 29.92 in. Hg.
WHY????