A body of mass 25kg changes its speed from 15m/s to 35m/s in 5 seconds by the action of an applied force F. Find the value of F.
100N
375N
500N
600N
Correct answer is A
F=ma=m(v−ut)
F=25(35−155)=25×4=100N
Two forces 10N and 15N act on an object at an angle of 120° to each other. Find the magnitude of the resultant.
5√5N
5√7N
7√5N
7√7N
Correct answer is B
No explanation has been provided for this answer.
A force of 200N acting on a body of mass 20kg initially at rest causes it to move a distance of 320m along a straight line for t secs. Find the value of t.
4s
6s
8s
10s
Correct answer is C
F = ma
200=20a⟹a=10m/s2
s=ut+12at2
320=(0×t)+1210t2
320=5t2⟹t2=64
t=8secs
A basket contains 3 red and 1 white identical balls. A ball is drawn from the basket at random. Calculate the probability that it is either white or red.
13
12
34
1
Correct answer is D
P(white or red) = P(white) + P(red)
= 34+14
= 1
Four doctors and two nurses are to sit round a circular table. In how many ways can this be done if the nurses are to sit together?
48
60
240
720
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