Qualification > Sciences
ALL CIE PHYSICS DOUBTS HERE !!!
Most UniQue™:
--- Quote from: raamishstudent on February 07, 2012, 03:03:00 pm ---A body of mass 2kg is moving on a horizontal surface with a speed of 1.41ms in a north-easterly direction.A force of 0.2 N acting in a westerly direction is applied to the body for 10s. If friction is negligible the body is then moving with a speed of
A. 0.41 m/s in a north-easterly direction.
B. 1.00 m/s in a northerly direction.
C. 1.41 m/s in a north-westerly direction.
D. 2.24 m/s in a direction 63.4degree east of north.
E. 2.41 m/s in a north-easterly direction
--- End quote ---
Whats the right answer? I wanna check
astarmathsandphysics:
B see attachment
Most UniQue™:
1. A thermometer can be read to an accuracy of ± 0.5 °C. This thermometer is used to measure a
temperature rise from 40 °C to 100 °C.
What is the percentage uncertainty in the measurement of the temperature rise?
A 0.5 % B 0.8 % C 1.3 % D 1.7%
2. In an experiment, a radio-controlled car takes 2.50 ± 0.05 s to travel 40.0 ± 0.1 m.
What is the car’s average speed and the uncertainty in this value?
A 16 ± 1 m s–1
B 16.0 ± 0.2 m s–1
C 16.0 ± 0.4 m s–1
D 16.00 ± 0.36 m s–1
astarmathsandphysics:
1. 1.7% the inituial tempe could be as high as 40.5 and the final temp could be as low as 40.5 ie a reading as low as 59 compared to an actual rise of 60. The difference is 1 so the % is 1/60*100=1.7%
2. speed is 40/2.5 =16 but could be as low as 39.9/2.55=15.65 or as high as 40.1/2.45=16.37
D
Most UniQue™:
--- Quote from: astarmathsandphysics on February 19, 2012, 12:23:56 pm ---1. 1.7% the inituial tempe could be as high as 40.5 and the final temp could be as low as 40.5 ie a reading as low as 59 compared to an actual rise of 60. The difference is 1 so the % is 1/60*100=1.7%
2. speed is 40/2.5 =16 but could be as low as 39.9/2.55=15.65 or as high as 40.1/2.45=16.37
D
--- End quote ---
For question 2 , I got the same answer as yours but the actual answer is C .
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