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Physics for soliton
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1.
1 point
An anti aircraft gun can fire four shots at a time. If the probabilities of the first, second, third and the last shot hitting the enemy aircraft are 0.7, 0.6, 0.5 and 0.4, what is the probability that four shots aimed at an enemy aircraft will bring the aircraft down?
0.036
0.084
0.964
0.916
2.
1 point
A man bets on number 16 on a roulette wheel 14 times and losses each time. On the 15th span he does a quick calculation and finds out that the number 12 had appeared twice in the 14 spans and is therefore, unable to decide whether to bet on 16 or 12 in the 15th span. Which will give him the best chance and what are the odds of winning on the bet that he takes? (Roulette has numbers 1 to 36)
12; 7 : 1
16; 22 : 14
Either; 35 : 1
12; 72 : 1
3.
1 point
If the force on a rocket moving with a velocity of 300 m / s is 210 N, then the rate of fuel combustion is
10.7 kg / s
1.4 kg / s
2.8 kg / s
0.7 kg / s
4.
1 point
From a bag containing 4 white and 5 black balls a man drawn 3 balls at random. What are the odds against these balls being black?
11/13
5/37
13/37
37/5
5.
1 point
An archer shoots an arrow with a velocity of 30 m/s at an angle of 20 degrees with respect to the horizontal. An assistant standing on the level ground 30 m downrange from the launch point throws an apple straight up with the minimum initial speed necessary to meet the path of the arrow. What is the initial speed of the apple and at what time after the arrow is launched should the apple be thrown so that the arrow hits the apple?
Answer:
6.
1 point
A bag contains 12 white and 18 black balls. Two balls are drawn in succession without replacement. What is the probability that first is white and second is black?
36/145
18/29
36/135
18/145
7.
1 point
A car is moving in a ci cular horizontal track of radius 10 m with a constant speed of 10 m / s. A plumb bob is suspended from the roof of the car by a light rigid rod of length 1.00 m. The angle made by the rod with the track is
30°
zero
45°
60°
8.
1 point
A horizontal force of 10 N is necessary to just hold a block
stationary against a wall. The coefficient of friction between the block
and the wall is 0.2. The weight of the block is
2N
20N
50N
100N
9.
1 point
An experiment succeeds twice as often as it fails. What is the probability that in the next 5 trials there will be four successes?
0
((2/3)^4)*(1/3)
(2/3)^4
5*((2/3)^4)*(1/3)
10.
1 point
In a race where 12 cars are running, the chance that car X will win is 1/6, that Y will win is 1/10 and that Z will win is 1/8. Assuming that a dead heat is impossible. Find the chance that one of them will win.
47/120
1/160
1/480
1/120
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