Military personnel also use periscopes in some gun turrets and in armoured vehicles. More complex periscopes using prisms or advanced fibre optics instead of mirrors and providing magnification operate on submarines and in various fields of science
Answer:
F = 50636.873 N
Explanation:
given,
bucket of water = 700-kg
length of cable = 20 m
Speed = 40 m/s
angle of the cable = 38.0°
let air resistance be = F
tension in rope be = T
T cos 38° = m×g..................(1)
..........(2)
equation (1)/(2)
![tan 38^0 =\dfrac{\dfrac{mv^2}{l} + F}{mg}](https://tex.z-dn.net/?f=tan%2038%5E0%20%3D%5Cdfrac%7B%5Cdfrac%7Bmv%5E2%7D%7Bl%7D%20%2B%20F%7D%7Bmg%7D)
![0.781=\dfrac{\dfrac{700\times 40^2}{20} + F}{700\times 9.8}](https://tex.z-dn.net/?f=0.781%3D%5Cdfrac%7B%5Cdfrac%7B700%5Ctimes%2040%5E2%7D%7B20%7D%20%2B%20F%7D%7B700%5Ctimes%209.8%7D)
F = 50636.873 N
Hence the force exerted on the bucket is equal to F = 50636.873 N
You are sitting at the center of a large turntable at an amusement park as it is set spinning freely. You decide to crawl towards the edge of the turntable. Rotational speed will decrease
There is no external torque
hence , the angular momentum of the table is conserved
L (initial) = L ( final)
since , L = m*v*r
where
m = mass
v = velocity
r = radius
If the person is crawled towards the outer rim, then the rotational inertia of the turntable will increase. In order to conserve the angular momentum , its rotational speed will decrease as mass and radius cannot be altered .
To learn more about torque here :
brainly.com/question/19104073
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Well depending on what current the heater pulls im going to assume about 13, and 13A for the hair dryer, thats 26A on the 40A circuit.
I dont see how a lightbulb could overload the circuit.
Anyway, assuming the circuit is overloaded by some really big heater- the circuit would trip, the fuse would go and remain off. Most houses are fitted with seperate circuits for lights and sockets, so the light may remain on depending on the breaker board. - the reason for them all being able to run with the sudden overload may be due to a surge.
One solution to this is not to put such a large heater on the circuit with other appliances.
Another may be to dry your hair in the dark