2. Physics - Q&A
134 questions found
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How many electrons does an `S` orbital hold?
- 6.
- 8.
- 2.
'S' what is mean???
If you push an object with a force of 5 N for 10 m in 4 seconds, how much power is used?
- 12.5 watts.
- 50.0 watts.
- 2.50 watts.
please explain
The work done in lifting a mass of 2000 kg vertically to a height of 40 metres is
- 392.4 kJ.
- 784.8 kJ.
- 196.2 kJ.
please explain
An aircraft flies 1350 nmiles in 2h 15mins. What is the average speed?
- 600 nmiles/hour.
- 675 nmiles/hour.
- 150 nmiles/hour.
please explain
The oscillation produced by a pendulum 2500mm long has a periodic time of
- 6 seconds.
- 3 seconds.
- 9 seconds.
please explain
A mass of 20kg produces a momentum of 300kgm/s. What is the Kinetic energy?
- 3250 Joules.
- 2250 Joules.
- 4500 Joules.
please explain
A pile driver of mass 1000 kg, hits a post 3 m below it. It moves the post 10 mm. Assuming gravity = 10 m/s, what is the kinetic energy of the pile driver?
- 30 kJ.
- 45 kJ.
- 90 kJ.
still not get it,can somebody explain it.
Two items weighing 11kg and 8kg are placed 2m and 1m respectively aft of the C of G of an aircraft. How far forward of the C of G must a weight of 30kg be placed so as not to change the C of G?
- 2m
- 3m
- 1m
still not get it,can somebody explain it.
An aircraft weighing 6400 pounds lands at a speed of 10 ft/Sec and stops in 10 Seconds. What force was generated by the brakets (asuming gravity as 32 ft/sec).
- -400 Lbs.
- -200 Lbs.
- -640 Lbs.
still not get it,can somebody explain it.
A fire engine is approaching you with its siren on. As it passes you its pitch
- increases.
- stays the same.
- decreases.
Please write your comment here.
An aircraft weighing 6400 pounds lands at a speed of 10 ft/Sec and stops in 10 Seconds. What force was generated by the brakets (asuming gravity as 32 ft/sec).
- -400 Lbs.
- -200 Lbs.
- -640 Lbs.
Plz solve this
For the CGS system, the force is
- the 'Newton' which produces an acceleration of 1cm/s2 for a mass of gram.
- the 'dyne' which produces an acceleration of 1cm/s2 for a mass of gram.
- the 'pd1' which produces an acceleration of 1 cm/s2 for a mass of gram.
I havent seen anything like this in any of the notes I have anyone understand it.?
A mass of 10kg placed 2 metres away from a pivot will have a moment of
- 196 NM.
- 150 NM.
- 980 NM.
Is this correct I thought it would have been 20nm
The tension in the cable of a crane is 2500 N and it lifts a load through 50m, what is the work done on the load?
- 1.25 * 10^5 J
- 2.50 * 10^4 J
- 5.00 * 10^3 J
Please explain.
A mass of 10kg placed 2 metres away from a pivot will have a moment of
- 196 NM.
- 150 NM.
- 980 NM.
How is this calculated ?
If a block of ice melts in a glass of water, the level of water in the glass will
- drop noticeably.
- rise noticeably.
- remain the same.
wouldn't be level of water rise?
Material A and material B are both removed from the same oven at the same time, after being in the same amount of time. Material A is a higher temperature than material B. This is because
- material B has a higher specific heat capacity.
- material A had a higher initial oven temperature.
- material A has a higher specific heat capacity.
why ?
A pilot requests 9.2 tonnes of fuel. The bowser driver reports to the pilot that the specific gravity is 0.8, what will the uplift be?
- 10200 litres.
- 11500 litres.
- 14375 litres.
Can someone explain this ?
Which has the greatest volume?
- 1 kg of water at 0 degreesC has a greater volume than 1 kg of ice at the same temperature.
- 1 kg of ice at 0 degreesC has a greater volume than 1 kg of water at the same temperature.
- Both 1 kg of ice at 0 degreesC and 1 kg of water at 0 degreesC have the same volume.
what exactly does this question test,attention to details i suppose.
Transfer of heat from a hot area to a cold area is
- conduction.
- convection.
- refraction.
Area should be defined for this question.
if solid yes your answer is right otherwise all 3 choices are correct.
A freely falling body, falling from a height of 2km, and assuming g = 10m/s2, will strike the ground in a time of
- 40s.
- 80s.
- 20s.
Can you give me the formula for this?
Two Vectors are at 90 degrees to each other having magnitudes of 3N and 4N. The resultant is
- 5N.
- 1N.
- 7N.
how??
The work done in lifting a mass of 2000 kg vertically to a height of 40 metres is
- 392.4 kJ.
- 784.8 kJ.
- 196.2 kJ.
how?
The angular velocity of 500 RPM is, in rads/seconds is equal to
- 33.33pi rads/s.
- 52.36pi rads/s.
- 16.66pi rads/s.
how ?
The fundamental frequency of a control cable is 10 Hz, the frequency of the 2nd Harmonic is
- 10 Hz.
- 20 Hz.
- 40 Hz.
any help with this ?